Hossein Nahavandchi

Om

Hossein Nahavandchi er professor i geodesi og geofysikk. Hans forskningsinteresser inkluderer klimaendringer og jordobservasjon ved hjelp av satellittdata, samt høy nøyaktighet GNSS-posisjonering med smartphone og u-blox.

Biography: Hossein Nahavandchi holds a PhD (1998) from the Royal Institute of Technology (KTH) in Stockholm. His primary research focus is satellite geodesy and GPS. He has been teaching in the fields of Geomatics and Geodesy since 1990. Since 2004, he has served as a Professor of Geodesy and Geophysics at the Norwegian University of Science and Technology (NTNU). He has also held several roles at the National Mapping Authority. Over the years, he has served as Head of Department, Vice-Dean, Dean, and Rector of the College of Engineering, as well as Director of the Research and Planning Division. He has chaired and served as a borad member in both the Research and Planning Division and the Education Department. His research projects and other civil engineering activitiers (BOA activities) have attracted more than 130 million NOK to the university sector since 1991, contributing to the developmemnt of a strong international network. His work has resulted in over 190 publications and presentations.

Forskning

SmartNav Positioning Engine: High-Precision GNSS Positioning for Autonomous Systems

The SmartNav Engine provides precise positioning for autonomous systems, overcoming urban and industrial challenges where traditional GNSS fails. It uses an advanced algorithm to transform low-cost receivers into decimeter-accurate instruments.

Monitoring Ocean Microplastics using GPS observations

We use reflected GNSS signals to provide worldwide map of microplastics distribution on ocean surface. The observations used are collected using bistatic sensors onboard the NASA CYGNSS mission over the equatorial and part of the mid-latitude regions.

Soil moisture monitoring using GNSS-Reflectometry

NASA Cyclone GNSS (CYGNSS) satellite data is used to monitor soil moisture variations over land areas. We have developed a package to calculate soil moisture using CYGNSS data and validate the results using ERA5 and SMAP soil moisture data.

ESA PRETTY GNSS-Reflectometry mission for studying Oceans and Arctic

Performing slant geometry GNSS-Reflectometry for precise altimetric determination of water and ice surfaces. The first ever interferometric GNSS-R measurement (iGNSS-R) for Galileo E5 signal is shown in the figure.

Earth Observing Satellite Technologies for Climate and Disaster Management

The project aims to use Earth Observing (EO) technologies in disaster management by providing accurate data for monitoring and responding to natural disasters such as earthquakes and floods. These technologies include GNSS, SAR, and GNSS-Reflectometry.

SmartNav: Precise GNSS Positioning with Low-cost Receivers for Next-Gen Mobility

The rise of autonomous driving and expansive use of smartphones for navigation underscores the need for accurate GNSS positioning. We developed a revolutionary approach promising dm-level accuracy even with low-cost receivers like smartphones and u-blox.

GNSS-Reflectometry for Flood Detection and Mapping

Flood detection and produced maps play essential roles in policymaking, planning, and implementing flood management. We use GNSS-R observation to study the potential of this technique for the retrieval of flood maps over the regions affected by the flood.

Remote Sensing of the Arctic and Ocean using GNSS Reflectometry observations

GNSS Reflectometry is a novel Earth observation technique. We investigate the methodology and instrumentation of an observing system with different geophysical parameters of interest such as sea ice thickness, sea surface height and wave height.

Groundwater depletion and dynamics from GRACE and hydrological observations

Groundwater is a strategic reservoir, and its shortage causes the next global crisis. GRACE satellites measure changes in terrestrial water storage. We estimate groundwater depletion and by a developed methodology enhance spatial scale over water basins.

Quantifying land subsidence and groundwater exploitation using InSAR observations

Monitoring spatial extent and temporal evolution of deformations associated with withdrawal of groundwater is critical to mitigate hazards. Using SAR data from the ENVISAT, ALOS and Sentinel-1, we analyzed land subsidence in regions around the world.

Optimization of standard methodology of the InSAR technique

Standard methodology of the SAR and InSAR technique in deformation mapping is improved. We implemented a polarimetric optimization approach on Sentinel-1 dual-polarization images to improve the standard persistent scatterer interferometric SAR method.

Quantifying water vapor contents using GNSS observations

Quantifying water vapor, a major greenhouse gas of the atmosphere, is necessary for the climate and meteorological applications. GNSS signals are promising measuring tools for water vapor. We have developed a method to extract water vapour from GNSS.

Ocean wave parameters estimation using single GPS Buoy observations

Accurate forecasts of wave conditions are of the utmost importance to all who live and work on or near ocean. We developed a method to enhance accuracy of estimated wave parameters (height, period, and direction) from a buoy equipped with a single GPS.

Global warming and Greenland Ice melting from satellite gravity observations

The GRACE satellite measures changes in Earth's gravity field caused by regional shifts in the Earth's mass including ice sheets, oceans, and land water. We developed a method to estimate the rate of ice mass variability over Greenland using GRACE data.

Climate change in North Atlantic and the Arctic sea from satellite altimetry observations

The Ocean plays a key role in determining global climate. To develop techniques for predicting future climate, one must understand dynamics of global ocean circulation. We developed a mean ocean surface model using multiple ESA/NASA altimetry satellites.

Publikasjoner

2026

Mohamadi, Ardeshir; Nahavandchi, Hossein; Khodabandeh, Amir. (2026) FLP-Aided GNSS RTK Positioning: A Means of Supporting Smartphone High-Precision Positioning in Dynamic Urban Environments. Navigation
Vitenskapelig artikkel

2025

Moreno, Mario; Semmling, Maximilian; Zus, Florian; Stienne, Georges; Dielacher, Andreas; Hoque, Mainul; Wickert, Jens; Nahavandchi, Hossein. (2025) Grazing-angle ionospheric delays observed during the GNSS-R PRETTY mission. Journal of Geodesy
Vitenskapelig artikkel
Ahmed, Naveed; Mohamadi, Ardeshir; Nahavandchi, Hossein. (2025) RFI localization using C/N<sub>0</sub> measurements from low cost GNSS sensors for robust positioning. Journal of Geodetic Science
Vitenskapelig artikkel
Rajabi, Mahmoud; Vajedian, Sanaz; Smith, Ryan; Grigg, Neil; Nahavandchi, Hossein; Goli, Mehdi. (2025) Identifying potential risk areas close to the oil and gas pipelines due to subsidence in Qazvin plain. Journal of Geodetic Science
Vitenskapelig artikkel
Mohamadi, Ardeshir; Nahavandchi, Hossein; Khodabandeh, Amir. (2025) Phase-Only positioning in urban environments: assessing its potential for mass-market GNSS receivers. Journal of Spatial Science
Vitenskapelig artikkel

2023

Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Asgarimehr, Milad; Semmling, Maximilian; Ramatschi, Markus; Goli, Mehdi; Wickert, Jens. (2023) Tidal harmonics retrieval using GNSS-R dual-frequency complex observations. Journal of Geodesy
Vitenskapelig artikkel

2022

Hoseini, Mostafa; Nahavandchi, Hossein. (2022) The potential of spaceborne GNSS reflectometry for detecting ocean surface currents. Remote Sensing of Environment
Vitenskapelig artikkel
Safdari, Zohreh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2022) Estimation of Groundwater Depletion in Iran’s Catchments Using Well Data. Water
Vitenskapelig artikkel
Safdari, Zohreh; Joodaki, Gholamreza; Nahavandchi, Hossein. (2022) A Technical Note on Least Squares Mascon Fitting to GRACE Satellite Data to Estimate Total Water Storage Changes in the Middle East.
Vitenskapelig kapittel

2021

Asgarimehr, Milad; Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Camps, Adriano; Nahavandchi, Hossein; Haas, Rüdiger; Wickert, Jens. (2021) Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel
Hoseini, Mostafa; Semmling, Maximilian; Nahavandchi, Hossein; Rennspiess, Erik; Ramatschi, Markus; Haas, Rüdiger; Strandberg, Joakim; Wickert, Jens. (2021) On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramaschi, Markus; Goli, Mehdi; Hass, R ̈udiger; Wickert, Jens. (2021) A Performance Assessment of Polarimetric GNSS-R Sea Level Monitoring in the Presence of Sea Surface Roughness. IEEE International Geoscience and Remote Sensing Symposium proceedings
Vitenskapelig artikkel
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximillian; Ramatschi, Markus; Goli, Mehdi; Haas, Rudiger; Wickert, Jens. (2021) Polarimetric GNSS-R Sea Level Monitoring using I/Q Interference Patterns at Different Antenna Configurations and Carrier Frequencies. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel

2020

Rajabi, Mahmoud; Amiri-Simkooei, Alireza; Nahavandchi, Hossein; Nafisi, Vahab. (2020) Modeling and Prediction of Regular Ionospheric Variations and Deterministic Anomalies. Remote Sensing
Vitenskapelig artikkel
Rajabi, Mahmoud; Nahavandchi, Hossein; Hoseini, Mostafa. (2020) Evaluation of CYGNSS Observations for Flood Detection and Mapping during Sistan and Baluchestan Torrential Rain in 2020. Water
Vitenskapelig artikkel
Hoseini, Mostafa; Alshawaf, Fadwa; Nahavandchi, Hossein; Dick, Galina; Wickert, Jens. (2020) Towards a zero-difference approach for homogenizing GNSS tropospheric products. GPS Solutions
Vitenskapelig artikkel
Hoseini, Mostafa; Asgarimehr, Milad; Zavorotny, valery; Nahavandchi, Hossein; Ruf, chris; Wickert, Jens. (2020) First Evidence of Mesoscale Ocean Eddies Signature in GNSS Reflectometry Measurements. Remote Sensing
Vitenskapelig artikkel
Shamshiri, Roghayeh; Motagh, Mahdi; Nahavandchi, Hossein; Haghshenas, Mahmud; Hoseini, Mostafa. (2020) Improving tropospheric corrections on large-scale Sentinel-1 interferogramsusing a machine learning approach for integration with GNSS-derived zenithtotal delay (ZTD). Remote Sensing of Environment
Vitenskapelig artikkel

2019

Hoseini, Mostafa; Asgarimehr, Milad; Nahavandchi, Hossein; Wickert, Jens. (2019) Spaceborne GNSS-R Observations of Mesoscale Ocean Eddies; Preliminary Results from Cygnss Mission. IEEE International Geoscience and Remote Sensing Symposium proceedings
Vitenskapelig artikkel

2018

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Andy, Hooper. (2018) Efficient Ground Surface Displacement Monitoring Using Sentinel-1 Data: Integrating Distributed Scatterers (DS) Identified Using Two-Sample t-Test with Persistent Scatterers (PS). Remote Sensing
Vitenskapelig artikkel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2018) Persistent Scatterer Analysis Using Dual-Polarization Sentinel-1 Data: Contribution From VH Channel. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Vitenskapelig artikkel

2017

Shamshiri, Roghayeh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2017) Seasonal variation analysis of Greenland ice mass time-series. Acta Geodaetica et Geophysica Hungarica
Vitenskapelig artikkel
Nahavandchi, Hossein; Haakonsen, Trond Arve; Aas, Håvard. (2017) Accuracy investigation of UAV Photomapping. Kart og Plan
Vitenskapelig artikkel
Motagh, Mahdi; Shamshiri, Roghayeh; Haghshenas, Mahmud; Wetzel, Hans-Ulrich; Akbari, Bahman; Nahavandchi, Hossein; Roessner, Sigrid; Arabi, Siavash. (2017) Quantifying groundwater exploitation induced subsidence in the Rafsanjan plain, southeastern Iran, using InSAR time-series and in situ measurements. Engineering Geology
Vitenskapelig artikkel

2016

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry.
Vitenskapelig kapittel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Haghshenas, Mahmud. (2016) Multi-sensor InSAR analysis of surface displacement over coastal urban city of Trondheim. Procedia Computer Science
Vitenskapelig artikkel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry. ESA SP
Vitenskapelig artikkel

2015

Nahavandchi, Hossein; Skogseth, Terje. (2015) Klimaovervåking med satellitter. Byggeindustrien
Fagartikkel
Nahavandchi, Hossein; Joodaki, Gholamreza; Schwartz, Vegar. (2015) GRACE-derived ice-mass loss spread over Greenland. Journal of Geodetic Science
Vitenskapelig artikkel

2014

Joodaki, Gholamreza; Nahavandchi, Hossein. (2014) Earth Mass Change Tracking Using GRACE Satellite Gravity Data. Norges teknisk-naturvitenskapelige universitet
Doktoravhandling

2013

Nahavandchi, Hossein; Skjeset, Lars. (2013) Geoid-type surface determination using a gravimetric quasigeoid model and GNSS/leveling data- A case study in eastern Norway. Kart og Plan
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein; Ghazavi, Kourosh. (2013) Steric sea level changes from ENVISAT and GRACE in the Nordic Seas. ESA SP
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein; Cheng, Kevin. (2013) Ocean Wave Measurement Using GPS Buoys. Journal of Geodetic Science
Vitenskapelig artikkel
Borge, Aina; Nahavandchi, Hossein. (2013) Geoid determination over Norway using global Earth gravity Models. Norges teknisk-naturvitenskapelige universitet
Masteroppgave

2012

Nahavandchi, Hossein; Joodaki, Gholamreza. (2012) Greenland ice-melt spread into Northwest Coast revealed by GRACE (GRACE data viser at issmeltingen på Grønland sprer seg til nordvestkysten). Kart og Plan
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass loss of the Greenland ice sheet from GRACE time-variable gravity measurements. Studia Geophysica et Geodaetica
Vitenskapelig artikkel
Nahavandchi, Hossein; Mahdavipour, Hossein. (2012) Sammenligning av geoidens høyde utledet fra geopotensialmodellen EGM2008 med GPS/nivellementsdata i et testområde i Iran (Comparison of geoid heights from the EGM2008 geopotential model and GPS/levelling data in a study area in Iran). Kart og Plan
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass balance and mass loss acceleration of the Greenland ice sheet (2002 – 2011) from GRACE gravity data. Journal of Geodetic Science
Vitenskapelig artikkel

2011

Ghazavi, Kourosh; Nahavandchi, Hossein. (2011) Mean Sea Surface and ocean circulation in North Atlantic and the Arctic Sea. Journal of Geodetic Science
Vitenskapelig artikkel

2010

Skeset, Lars; Nahavandchi, Hossein. (2010) Bestemmelse av høydereferansemodell ved bruk av gravimetrisk geoidemodell og GNSS/nivellementsdata. NTNU
Masteroppgave
Nahavandchi, Hossein; Joodaki, Gholamreza. (2010) CORRELATION ANALYSIS OF MULTIPATH EFFECTS IN GPS-CODE AND CARRIER PHASE OBSERVATIONS. Survey Review
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2010) Greenland mass balance estimation from satellite gravity measurements. ESA SP
Vitenskapelig artikkel

2009

Østerbø, Øystein Kvaal; Nahavandchi, Hossein. (2009) Korrelasjonsanalyse av sanntids GNSS-data. Norges teknisk-naturvitenskapelige universitet
Masteroppgave
Hervig, Lars; Nahavandchi, Hossein. (2009) En analyse av GNSS tilgjenglighet og nøyaktighet i Norge ved bruk av GPS og Galileo. Norges teknisk-naturvitenskapelige universitet
Masteroppgave
Brunes, Morten Taraldsten; Nahavandchi, Hossein. (2009) Beregning og analyse av relativ og absolutt GPS fasesentervariasjon. NTNU
Masteroppgave

2008

Korsnes, Andreas Prebensen; Nahavandchi, Hossein. (2008) Tilgjengelighet og korrelasjonsanalyse av GNSS-data. Tapir NTNU
Masteroppgave
Ghazavi, Kourosh; Nahavandchi, Hossein. (2008) Satellite Altimetry derived Mean Sea Surface and its error analysis over OCTAS study area. OCTAS-Ocean Circulation and Transport between north Atlantic and the Arctic Sea. Tapir Uttrykk
Doktoravhandling
Nahavandchi, Hossein; Soltanpour, Ali. (2008) Local ionospheric modelling of GPS code and carrier phase observations. Survey Review
Vitenskapelig artikkel
Omang, Ove Christian Dahl; Hunegnaw, Addisu; Solheim, Dag; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2008) Updated OCTAS geoid in the northern North Atlantic - OCTAS07. International Association of Geodesy Symposia
Vitenskapelig artikkel

2007

Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Ocean Circulation and Transport Between North Atlantic and the Arctic Sea with a focus on the importance of a high accuracy geoid model. General Command of Mapping
Vitenskapelig artikkel
Nahavandchi, Hossein; Soltanpour, Ali. (2007) Different Gravimetric Geoid Models over Iran with and without Terrestrial Gravity Data. General Command of Mapping
Vitenskapelig artikkel
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; siegismund, Frank; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald; Lysaker, Dagny. (2007) The OCTAS poject, The geoid, the mean sea surface and the mean dynamic topography.
Vitenskapelig kapittel
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) OCTAS with a focus on the importance of a high precision mean sea surface. Geophysical Research Abstracts
Konferanseabstract
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Updated OCTAS geoid – OCTAS07. Geophysical Research Abstracts
Konferanseabstract
Soltanpour, Ali; Nahavandchi, Hossein. (2007) Geoid and Geoid-type Surface Determination- Improved Determination of Heights from Global Positioning System. Tapir Akademisk Forlag
Doktoravhandling
Soltanpour, Ali; Solheim, Dag; Omang, Ove Christian Dahl; Nahavandchi, Hossein; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald; Lysaker, Dagny; Drange, Helge; Johannessen, Johnny; Gidskehaug, Arne. (2007) Assessment and Validation of the geoid, MSS and MDT models in the OCTAS project. Geophysical Research Abstracts
Konferanseabstract
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Soltanpour, Ali; Drange, Helge; Nahavandchi, Hossein; Johannessen, Johnny; Siegismund, Frank; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald. (2007) The OCTAS project, the interrelationship between the geoid, the mean sea surface and the mean dynamic topography. Geophysical Research Abstracts
Konferanseabstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) The OCTAS07- North Atlantic/Arctic ocean mean sea surface model based on a wavelet adjustment of multiple satellite altimetry data. Geophysical Research Abstracts
Konferanseabstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) The OCTAS06-North Atlantic/Arctic ocean mean sea surface model. Geophysical Research Abstracts
Konferanseabstract
Evanger, Kim; Nahavandchi, Hossein. (2007) Investigation of Applanix POS Post-Process Package (POSPac) for GPS/INS Positioning/Navigation system. NTNU
Masteroppgave
Vangen, Vibeke; Nahavandchi, Hossein. (2007) Error Budget in Seabed Mapping. NTNU
Masteroppgave
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny Iren; Ghazavi, K; Nahavandchi, Hossein. (2007) OCTAS with a focus on the importance of a high accuracy geoid.
Vitenskapelig kapittel
Soltanpour, Ali; Nahavandchi, Hossein; Ghazavi, Kourosh. (2007) Recovery of marine gravity anomalies from ERS1, ERS2 and ENVISAT satellite altimetry data for geoid computations over Norway. Studia Geophysica et Geodaetica
Vitenskapelig artikkel

1999

Nahavandchi, Hossein. (1999) Terrain correction computations by spherical harmonics and integral formulas. Physics and chemistry of the earth. Part A: Solid earth and geodesy
Vitenskapelig artikkel
Sjöberg, Lars Erik; Nahavandchi, Hossein. (1999) On the indirect effect in the Stokes-Helmert method of geoid determination. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (1999) Geoid terrain correction to power H (super 5) of satellite derived geopotential models. Bollettino di Geodesia e Scienze Affini
Vitenskapelig artikkel

1998

Nahavandchi, Hossein. (1998) Precise Gravimetric-GPS Geoid Determination with Improved Topographic Corrections Applid over Sweden. Department of Geodesy and Photogrammetry, KTH
Doktoravhandling
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Terrain corrections to power H3 in gravimetric geoid determination. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Unification of vertical datums by GPS and gravimetric geoid models using modified Stokes formula. Marine Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (1998) On some methods of downward continuation of mean free-air gravity anomaly. IGeS Bulletin
Vitenskapelig artikkel

1997

Nahavandchi, Hossein. (1997) Terrain effects in geoid determination over Iran. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1997) The Atmospheric Geoid effects over Iran. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1997) Connection of vertical datums using geoid models. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel

1996

Nahavandchi, Hossein. (1996) Determination of Spherical Harmonics coefficients by Integral Formula and Collocation method. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel

1995

Nahavandchi, Hossein. (1995) External Gravity Potential of the Earth and the problem of spherical harmonics Convergency in Physical Geodesy. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel

1994

Nahavandchi, Hossein. (1994) Compilation of 10' by 10' mean gravity anomalies in Iran. K.N.Toosi University of Technology
Masteroppgave

1993

Nahavandchi, Hossein. (1993) Geoid Determination with geometrical methods. Scientific and Technical Journal of NGO
Vitenskapelig artikkel

Tidsskriftspublikasjoner

Mohamadi, Ardeshir; Nahavandchi, Hossein; Khodabandeh, Amir. (2026) FLP-Aided GNSS RTK Positioning: A Means of Supporting Smartphone High-Precision Positioning in Dynamic Urban Environments. Navigation
Vitenskapelig artikkel
Moreno, Mario; Semmling, Maximilian; Zus, Florian; Stienne, Georges; Dielacher, Andreas; Hoque, Mainul; Wickert, Jens; Nahavandchi, Hossein. (2025) Grazing-angle ionospheric delays observed during the GNSS-R PRETTY mission. Journal of Geodesy
Vitenskapelig artikkel
Ahmed, Naveed; Mohamadi, Ardeshir; Nahavandchi, Hossein. (2025) RFI localization using C/N<sub>0</sub> measurements from low cost GNSS sensors for robust positioning. Journal of Geodetic Science
Vitenskapelig artikkel
Rajabi, Mahmoud; Vajedian, Sanaz; Smith, Ryan; Grigg, Neil; Nahavandchi, Hossein; Goli, Mehdi. (2025) Identifying potential risk areas close to the oil and gas pipelines due to subsidence in Qazvin plain. Journal of Geodetic Science
Vitenskapelig artikkel
Mohamadi, Ardeshir; Nahavandchi, Hossein; Khodabandeh, Amir. (2025) Phase-Only positioning in urban environments: assessing its potential for mass-market GNSS receivers. Journal of Spatial Science
Vitenskapelig artikkel
Hoseini, Mostafa; Nahavandchi, Hossein. (2022) The potential of spaceborne GNSS reflectometry for detecting ocean surface currents. Remote Sensing of Environment
Vitenskapelig artikkel
Rajabi, Mahmoud; Amiri-Simkooei, Alireza; Nahavandchi, Hossein; Nafisi, Vahab. (2020) Modeling and Prediction of Regular Ionospheric Variations and Deterministic Anomalies. Remote Sensing
Vitenskapelig artikkel
Asgarimehr, Milad; Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Camps, Adriano; Nahavandchi, Hossein; Haas, Rüdiger; Wickert, Jens. (2021) Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Ocean Circulation and Transport Between North Atlantic and the Arctic Sea with a focus on the importance of a high accuracy geoid model. General Command of Mapping
Vitenskapelig artikkel
Rajabi, Mahmoud; Nahavandchi, Hossein; Hoseini, Mostafa. (2020) Evaluation of CYGNSS Observations for Flood Detection and Mapping during Sistan and Baluchestan Torrential Rain in 2020. Water
Vitenskapelig artikkel
Hoseini, Mostafa; Asgarimehr, Milad; Nahavandchi, Hossein; Wickert, Jens. (2019) Spaceborne GNSS-R Observations of Mesoscale Ocean Eddies; Preliminary Results from Cygnss Mission. IEEE International Geoscience and Remote Sensing Symposium proceedings
Vitenskapelig artikkel
Nahavandchi, Hossein; Joodaki, Gholamreza. (2012) Greenland ice-melt spread into Northwest Coast revealed by GRACE (GRACE data viser at issmeltingen på Grønland sprer seg til nordvestkysten). Kart og Plan
Vitenskapelig artikkel
Nahavandchi, Hossein; Soltanpour, Ali. (2007) Different Gravimetric Geoid Models over Iran with and without Terrestrial Gravity Data. General Command of Mapping
Vitenskapelig artikkel
Nahavandchi, Hossein. (2000) Computation of mean free-air gravity anomalies by Bjerhammar's deterministic and collocation methods over Scandinavia. Survey Review
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Vitenskapelig artikkel
Sjöberg, Lars Erik; Nahavandchi, Hossein. (2000) The atmospheric geoid effects in Stokes’ formula. Geophysical Journal International
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Terrain corrections to power H3 in gravimetric geoid determination. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (1999) Terrain correction computations by spherical harmonics and integral formulas. Physics and chemistry of the earth. Part A: Solid earth and geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Unification of vertical datums by GPS and gravimetric geoid models using modified Stokes formula. Marine Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (2004) The Quest for a Precise Geoidal Height Model. Kart og Plan
Vitenskapelig artikkel
Nahavandchi, Hossein. (2004) A new strategy for the atmospheric gravity effect in gravimetric geoid determination. Journal of Geodesy
Vitenskapelig artikkel
Ghazavi, Kourosh; Nahavandchi, Hossein. (2011) Mean Sea Surface and ocean circulation in North Atlantic and the Arctic Sea. Journal of Geodetic Science
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Two different views of topographical and downward-continuation corrections in the Stokes-Helmert approach to geoid computation. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (2000) The direct topographical correction in gravimetric geoid determination by the Stokes-Helmert method. Journal of Geodesy
Vitenskapelig artikkel
Sjöberg, Lars Erik; Nahavandchi, Hossein. (1999) On the indirect effect in the Stokes-Helmert method of geoid determination. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (1998) On some methods of downward continuation of mean free-air gravity anomaly. IGeS Bulletin
Vitenskapelig artikkel
Nahavandchi, Hossein. (1999) Geoid terrain correction to power H (super 5) of satellite derived geopotential models. Bollettino di Geodesia e Scienze Affini
Vitenskapelig artikkel
Nahavandchi, Hossein. (2004) The direct effect and downward continuation correction of atmospheric masses in gravimetric geoid determination. Bollettino di Geodesia e Scienze Affini
Vitenskapelig artikkel
Nahavandchi, Hossein. (2003) Corrections to "Two different methods of geoidal height determinations using a spherical harmonic representation of the geopotential, topographic corrections and the height anomaly-geoidal height difference". Journal of Geodesy
Korrigendum
Nahavandchi, Hossein; Skogseth, Terje. (2015) Klimaovervåking med satellitter. Byggeindustrien
Fagartikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass loss of the Greenland ice sheet from GRACE time-variable gravity measurements. Studia Geophysica et Geodaetica
Vitenskapelig artikkel
Hoseini, Mostafa; Semmling, Maximilian; Nahavandchi, Hossein; Rennspiess, Erik; Ramatschi, Markus; Haas, Rüdiger; Strandberg, Joakim; Wickert, Jens. (2021) On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel
Nahavandchi, Hossein. (2003) A Comparison of the classical and recent formulae of handling the effects of close and distant topographic masses in gravimetric geoid computations. Newton's Bulletin
Vitenskapelig artikkel
Soltanpour, Ali; Nahavandchi, Hossein. (2006) A new high-resolution geoid for Iran with emphasise on different modification procedures and new GRACE geopotential model. Geophysical Research Abstracts
Konferanseabstract
Soltanpour, Ali; Nahavandchi, Hossein; Featherstone, Will. (2006) Geoid-type surface determination using wavelet-based combination of gravimetric quasi/geoid and GPS-levelling data. Geophysical Research Abstracts
Konferanseabstract
Soltanpour, Ali; Nahavandchi, Hossein; Ghazavi, Kourosh. (2006) Recovery of marine gravity anomaly from ERS2 and ENVISAT data and its contribution to the geoid of Norway. Geophysical Research Abstracts
Konferanseabstract
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Haghshenas, Mahmud. (2016) Multi-sensor InSAR analysis of surface displacement over coastal urban city of Trondheim. Procedia Computer Science
Vitenskapelig artikkel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2017) Seasonal variation analysis of Greenland ice mass time-series. Acta Geodaetica et Geophysica Hungarica
Vitenskapelig artikkel
Nahavandchi, Hossein; Haakonsen, Trond Arve; Aas, Håvard. (2017) Accuracy investigation of UAV Photomapping. Kart og Plan
Vitenskapelig artikkel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry. ESA SP
Vitenskapelig artikkel
Nahavandchi, Hossein; Joodaki, Gholamreza. (2010) CORRELATION ANALYSIS OF MULTIPATH EFFECTS IN GPS-CODE AND CARRIER PHASE OBSERVATIONS. Survey Review
Vitenskapelig artikkel
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) OCTAS with a focus on the importance of a high precision mean sea surface. Geophysical Research Abstracts
Konferanseabstract
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Updated OCTAS geoid – OCTAS07. Geophysical Research Abstracts
Konferanseabstract
Safdari, Zohreh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2022) Estimation of Groundwater Depletion in Iran’s Catchments Using Well Data. Water
Vitenskapelig artikkel
Soltanpour, Ali; Solheim, Dag; Omang, Ove Christian Dahl; Nahavandchi, Hossein; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald; Lysaker, Dagny; Drange, Helge; Johannessen, Johnny; Gidskehaug, Arne. (2007) Assessment and Validation of the geoid, MSS and MDT models in the OCTAS project. Geophysical Research Abstracts
Konferanseabstract
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Soltanpour, Ali; Drange, Helge; Nahavandchi, Hossein; Johannessen, Johnny; Siegismund, Frank; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald. (2007) The OCTAS project, the interrelationship between the geoid, the mean sea surface and the mean dynamic topography. Geophysical Research Abstracts
Konferanseabstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) The OCTAS07- North Atlantic/Arctic ocean mean sea surface model based on a wavelet adjustment of multiple satellite altimetry data. Geophysical Research Abstracts
Konferanseabstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.; Yi, Yochan; Lysaker, Dagny; Pettersen, Bjørn Ragnvald; Drange, Helge. (2007) The OCTAS06-North Atlantic/Arctic ocean mean sea surface model. Geophysical Research Abstracts
Konferanseabstract
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Andy, Hooper. (2018) Efficient Ground Surface Displacement Monitoring Using Sentinel-1 Data: Integrating Distributed Scatterers (DS) Identified Using Two-Sample t-Test with Persistent Scatterers (PS). Remote Sensing
Vitenskapelig artikkel
Nyrnes, Erik; Torkildsen, Torgeir; Nahavandchi, Hossein. (2005) Detection of Gross Errors in Wellbore Directional Surveying for Petroleum Production with emphasis on Reliability Analyses. Kart og Plan
Vitenskapelig artikkel
Nahavandchi, Hossein. (1997) Terrain effects in geoid determination over Iran. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1993) Geoid Determination with geometrical methods. Scientific and Technical Journal of NGO
Vitenskapelig artikkel
Nahavandchi, Hossein; Soltanpour, Ali. (2008) Local ionospheric modelling of GPS code and carrier phase observations. Survey Review
Vitenskapelig artikkel
Nahavandchi, Hossein. (1996) Determination of Spherical Harmonics coefficients by Integral Formula and Collocation method. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1995) External Gravity Potential of the Earth and the problem of spherical harmonics Convergency in Physical Geodesy. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1997) The Atmospheric Geoid effects over Iran. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein. (1997) Connection of vertical datums using geoid models. Scientific and Technical Quarterly Journal of NCC
Vitenskapelig artikkel
Nahavandchi, Hossein; Skjeset, Lars. (2013) Geoid-type surface determination using a gravimetric quasigeoid model and GNSS/leveling data- A case study in eastern Norway. Kart og Plan
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein; Ghazavi, Kourosh. (2013) Steric sea level changes from ENVISAT and GRACE in the Nordic Seas. ESA SP
Vitenskapelig artikkel
Omang, Ove Christian Dahl; Hunegnaw, Addisu; Solheim, Dag; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2008) Updated OCTAS geoid in the northern North Atlantic - OCTAS07. International Association of Geodesy Symposia
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2010) Greenland mass balance estimation from satellite gravity measurements. ESA SP
Vitenskapelig artikkel
Nahavandchi, Hossein; Joodaki, Gholamreza; Schwartz, Vegar. (2015) GRACE-derived ice-mass loss spread over Greenland. Journal of Geodetic Science
Vitenskapelig artikkel
Nahavandchi, Hossein. (2002) Two different methods of geoidal height determinations using a spherical harmonic representation of the geopotential, topographic corrections and the height anomaly-geoidal height difference. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein; Mahdavipour, Hossein. (2012) Sammenligning av geoidens høyde utledet fra geopotensialmodellen EGM2008 med GPS/nivellementsdata i et testområde i Iran (Comparison of geoid heights from the EGM2008 geopotential model and GPS/levelling data in a study area in Iran). Kart og Plan
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Vitenskapelig artikkel
Nahavandchi, Hossein. (2003) Use of global geopotential models for comparison of gravimetric geoid estimators by the modification of Stoke's formula. Bollettino di Geodesia e Scienze Affini
Vitenskapelig artikkel
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramaschi, Markus; Goli, Mehdi; Hass, R ̈udiger; Wickert, Jens. (2021) A Performance Assessment of Polarimetric GNSS-R Sea Level Monitoring in the Presence of Sea Surface Roughness. IEEE International Geoscience and Remote Sensing Symposium proceedings
Vitenskapelig artikkel
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Two different views of topographical and downward-continuation corrections in the Stokes-Helmert approach to geoid computation. Journal of Geodesy
Vitenskapelig artikkel
Hoseini, Mostafa; Alshawaf, Fadwa; Nahavandchi, Hossein; Dick, Galina; Wickert, Jens. (2020) Towards a zero-difference approach for homogenizing GNSS tropospheric products. GPS Solutions
Vitenskapelig artikkel
Hoseini, Mostafa; Asgarimehr, Milad; Zavorotny, valery; Nahavandchi, Hossein; Ruf, chris; Wickert, Jens. (2020) First Evidence of Mesoscale Ocean Eddies Signature in GNSS Reflectometry Measurements. Remote Sensing
Vitenskapelig artikkel
Nahavandchi, Hossein; Soltanpour, Ali. (2006) Improved determination of heights using a conversion surface by combining gravimetric quasi-geoid/geoid and GPS-levelling height differences. Studia Geophysica et Geodaetica
Vitenskapelig artikkel
Soltanpour, Ali; Nahavandchi, Hossein; Featherstone, Will. (2006) The Use of Second-generation Wavelets to Combine a Gravimetric Quasigeoid Model with GPS-levelling Data. Journal of Geodesy
Vitenskapelig artikkel
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Asgarimehr, Milad; Semmling, Maximilian; Ramatschi, Markus; Goli, Mehdi; Wickert, Jens. (2023) Tidal harmonics retrieval using GNSS-R dual-frequency complex observations. Journal of Geodesy
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass balance and mass loss acceleration of the Greenland ice sheet (2002 – 2011) from GRACE gravity data. Journal of Geodetic Science
Vitenskapelig artikkel
Joodaki, Gholamreza; Nahavandchi, Hossein; Cheng, Kevin. (2013) Ocean Wave Measurement Using GPS Buoys. Journal of Geodetic Science
Vitenskapelig artikkel
Shamshiri, Roghayeh; Motagh, Mahdi; Nahavandchi, Hossein; Haghshenas, Mahmud; Hoseini, Mostafa. (2020) Improving tropospheric corrections on large-scale Sentinel-1 interferogramsusing a machine learning approach for integration with GNSS-derived zenithtotal delay (ZTD). Remote Sensing of Environment
Vitenskapelig artikkel
Motagh, Mahdi; Shamshiri, Roghayeh; Haghshenas, Mahmud; Wetzel, Hans-Ulrich; Akbari, Bahman; Nahavandchi, Hossein; Roessner, Sigrid; Arabi, Siavash. (2017) Quantifying groundwater exploitation induced subsidence in the Rafsanjan plain, southeastern Iran, using InSAR time-series and in situ measurements. Engineering Geology
Vitenskapelig artikkel
Soltanpour, Ali; Nahavandchi, Hossein; Ghazavi, Kourosh. (2007) Recovery of marine gravity anomalies from ERS1, ERS2 and ENVISAT satellite altimetry data for geoid computations over Norway. Studia Geophysica et Geodaetica
Vitenskapelig artikkel
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximillian; Ramatschi, Markus; Goli, Mehdi; Haas, Rudiger; Wickert, Jens. (2021) Polarimetric GNSS-R Sea Level Monitoring using I/Q Interference Patterns at Different Antenna Configurations and Carrier Frequencies. IEEE Transactions on Geoscience and Remote Sensing
Vitenskapelig artikkel
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2018) Persistent Scatterer Analysis Using Dual-Polarization Sentinel-1 Data: Contribution From VH Channel. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Vitenskapelig artikkel

Del av bok/rapport

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry.
Vitenskapelig kapittel
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; siegismund, Frank; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald; Lysaker, Dagny. (2007) The OCTAS poject, The geoid, the mean sea surface and the mean dynamic topography.
Vitenskapelig kapittel
Safdari, Zohreh; Joodaki, Gholamreza; Nahavandchi, Hossein. (2022) A Technical Note on Least Squares Mascon Fitting to GRACE Satellite Data to Estimate Total Water Storage Changes in the Middle East.
Vitenskapelig kapittel
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny Iren; Ghazavi, K; Nahavandchi, Hossein. (2007) OCTAS with a focus on the importance of a high accuracy geoid.
Vitenskapelig kapittel

Rapport

Nahavandchi, Hossein. (2001) Physical Geodesy. Department of Geomatics
Arbeidsnotat
Nahavandchi, Hossein. (2006) HIGH-RESOLUTION GEOID DETERMINATION- IRanian Gravimetric Geoid 2005 (IRGG05). National Cartographic Center of Iran
Forskningsrapport

Studentoppgave eller avhandling

Korsnes, Andreas Prebensen; Nahavandchi, Hossein. (2008) Tilgjengelighet og korrelasjonsanalyse av GNSS-data. Tapir NTNU
Masteroppgave
Pettersen, Øystein; Nahavandchi, Hossein. (2005) Spektralanalyse av kontinuerlige GPS-målinger. NTNU
Masteroppgave
Skeset, Lars; Nahavandchi, Hossein. (2010) Bestemmelse av høydereferansemodell ved bruk av gravimetrisk geoidemodell og GNSS/nivellementsdata. NTNU
Masteroppgave
Eide, Trond Petter; Nahavandchi, Hossein. (2005) Analyse og modellering av ionosfærisk feil ved permanente GPS stasjoner. NTNU
Masteroppgave
Huser, Helge; Nahavandchi, Hossein. (2004) An Investigation to the GPS data processing using GAMIT/GLOBK and GIPSY-OASIS II Scientific software Package. NTNU
Masteroppgave
Nahavandchi, Hossein. (1998) Precise Gravimetric-GPS Geoid Determination with Improved Topographic Corrections Applid over Sweden. Department of Geodesy and Photogrammetry, KTH
Doktoravhandling
Nahavandchi, Hossein. (1994) Compilation of 10' by 10' mean gravity anomalies in Iran. K.N.Toosi University of Technology
Masteroppgave
Fløisbonn, Håkon Solhaug; Nahavandchi, Hossein. (2006) Time Series Analysis of Real Time GPS-data. NTNU
Masteroppgave
Ghazavi, Kourosh; Nahavandchi, Hossein. (2008) Satellite Altimetry derived Mean Sea Surface and its error analysis over OCTAS study area. OCTAS-Ocean Circulation and Transport between north Atlantic and the Arctic Sea. Tapir Uttrykk
Doktoravhandling
Soltanpour, Ali; Nahavandchi, Hossein. (2007) Geoid and Geoid-type Surface Determination- Improved Determination of Heights from Global Positioning System. Tapir Akademisk Forlag
Doktoravhandling
Nyrnes, Erik; Nahavandchi, Hossein. (2006) Error Analyses and Quality Control of Wellbore Directional Surveys. Tapir Akademisk Forlag
Doktoravhandling
Østerbø, Øystein Kvaal; Nahavandchi, Hossein. (2009) Korrelasjonsanalyse av sanntids GNSS-data. Norges teknisk-naturvitenskapelige universitet
Masteroppgave
Hervig, Lars; Nahavandchi, Hossein. (2009) En analyse av GNSS tilgjenglighet og nøyaktighet i Norge ved bruk av GPS og Galileo. Norges teknisk-naturvitenskapelige universitet
Masteroppgave
Joodaki, Gholamreza; Nahavandchi, Hossein. (2014) Earth Mass Change Tracking Using GRACE Satellite Gravity Data. Norges teknisk-naturvitenskapelige universitet
Doktoravhandling
Evanger, Kim; Nahavandchi, Hossein. (2007) Investigation of Applanix POS Post-Process Package (POSPac) for GPS/INS Positioning/Navigation system. NTNU
Masteroppgave
Vangen, Vibeke; Nahavandchi, Hossein. (2007) Error Budget in Seabed Mapping. NTNU
Masteroppgave
Brunes, Morten Taraldsten; Nahavandchi, Hossein. (2009) Beregning og analyse av relativ og absolutt GPS fasesentervariasjon. NTNU
Masteroppgave
Borge, Aina; Nahavandchi, Hossein. (2013) Geoid determination over Norway using global Earth gravity Models. Norges teknisk-naturvitenskapelige universitet
Masteroppgave
Haakonsen, Trond Arve; Nahavandchi, Hossein; Plag, Hans-Peter. (2005) Temporal and Spatial Analyses of Continuous GPS Observations. Norges teknisk-naturvitenskapelige universitet
Doktoravhandling

Undervisning

Emner

Formidling

2026

Foredrag

Nahavandchi, Hossein. (2026) Remote Sensing of Soil Moisture Using GNSS Reflectometry for Climate and Environmental Monitoring. NTNU UC Berkeley Workshop, Sensing the Sustainable City

2025

Konferanseforedrag

Semmling, Maximilian; Moreno, Mario; Zus, Florian; Li, Weiqiang; Dielacher, Andreas; Nahavandchi, Hossein; Hoque, Mainul; Wickert, Jens; Cardellach, Estel. (2025) GNSS REMOTE SENSING OF THE PRETTY CUBESAT MISSION: A DEMONSTRATION TO VALIDATE MODELS OF IONOSPHERIC ELECTRON DENSITY. Small Satellites for Earth System Observation
Konferanseforedrag

Semmling, Maximilian; Moreno, Mario; Zus, Florian; Dielacher, Andreas; Hoque, Mainul; Nahavandchi, Hossein; Wickert, Jens. (2025) Grazing angle GNSS reflectometry with the PRETTY satellite: an opportunity to resolve the structure of ionospheric layers. EGU General Assembly 2025
Konferanseposter

Moreno, Mario; Semmling, Maximilian; Zus, Florian; Stienne, Georges; Dielacher, Andreas; Nahavandchi, Hossein; Hoque, Mainul; Wickert, Jens; Asgarimehr, Milad; Cardellach, Estel. (2025) Grazing-Angle Ionospheric Delay on GNSS-R: Findings from the ESA PRETTY Mission Observations. Living Planet Symposium

2024

Konferanseforedrag

Dielacher, Andreas; Moser-Moritsch, Michael; Hoermanseder, Walter; Semmling, Maximilian; Li, Weiqiang; Nahavandchi, Hossein; Zus, Glorian; Moreno, Mario; Wickert, Jens; Cardellach, Estel. (2024) PRETTY – First experience from a 3U CubeSat In-Orbit Demonstrator for GNSS-Reflectometry under grazing angle geometry. EGU General Assembly 2024
Konferanseposter

Semmling, Maximilian; Li, Weiqiang; Zus, Florian; Hoseini, Mostafa; Moreno, Mario; Nahavandchi, Hossein; Hoque, Mainul; Wickert, Jens; Dielacher, Andreas; Cardellach, Estel. (2024) Building a comprehensive picture of sea surface, troposphere and ionosphere contributions in precise GNSS reflectometry from space. EGU General Assembly 2024
Foredrag

Nahavandchi, Hossein; Hoseini, Mostafa; Rajabi, Mahmoud. (2024) NTNU’s CubeSat initiative and projects. Academic presentation
Konferanseforedrag

Cardellach, Estel; Li, Weiqiang; Nahavandchi, Hossein; Semmling, Maximilian; Moreno, Mario; Hoque, Mainul; Wickert, Jens; Asgarimehr, Milad; Zus, Florian; Dielacher, Andreas. (2024) PRECISE GNSS-R ALTIMETRY WITH THE ESA PRETTY CUBESAT: INITIAL IN-ORBIT RESULTS. IEEE International Geoscience and Remote Sensing Symposium
Konferanseforedrag

Semmling, Maximilian; Moreno, Mario; Zus, Florian; Hoque, Mainul; Wickert, Jens; Nahavandchi, Hossein; Dielacher, Andreas; Badia, P; Voigtmann, T; Götz, J. (2024) Ionospheric impact on space-borne GNSS reflectometry: studying satellite and sounding rocket scenarios. National Space Weather Workshop 2024
Konferanseforedrag

Semmling, Maximilian; Li, Weiqiang; Wickert, Jens; Cardellach, Estel; Dielacher, Andreas; Nahavandchi, Hossein. (2024) Coherent Reflectometry from Space: Sensitivity to Sea-Surface Height and Atmospheric Disturbance. International Conference on Electromagnetics in Advanced Applications
Konferanseforedrag

Nahavandchi, Hossein; Semmling, Maximilian; Asgarimehr, Milad; Cardellach, Estel; Li, Weiqiang; Zus, Florian; Moreno, Mario; Dielacher, Andreas; Wickert, Jens; Moser-moritsch, Michael. (2024) PRETTY- ESA’s GNSS Reflection Technology for Remote Sensing of the Earth. International Association of Geodesy GNSS-R
Konferanseforedrag

Dielacher, Andreas; Moser-moritsch, Michael; Nahavandchi, Hossein; Semmling, Maximilian; Asgarimehr, Milad; Cardellach, Estel; Li, Weiqiang; Zus, Florian; Moreno, Mario; Wickert, Jens. (2024) PRETTY- ESA’s GNSS Reflectometry CubeSat – Design and configuration of the payload. International Association of Geodesy GNSS-R

2023

Foredrag

Mohamadi, Ardeshir; Nahavandchi, Hossein. (2023) Precise GNSS Positioning with Low-cost Receivers for Next-Gen Mobility. Academic presentation
Foredrag

Nahavandchi, Hossein; Hoseini, Mostafa; Rajabi, Mahmoud. (2023) Using GNSS reflected signals for study of Ocean and Ice parameters. Academic presentation
Konferanseforedrag

Semmling, Maximilian; Li, Weiqiang; Hoque, Mainul; Wickert, Jens; Cardellach, Estel; Nahavandchi, Hossein. (2023) PRETTY MISSION PREPARATIONS: STEPS TO FOSTER GRAZING-ANGLE REFLECTOMETRY. IEEE IGARSS 2023
Konferanseforedrag

Moreno, Mario; Semmling, Maximilian; Nahavandchi, Hossein; Wickert, Jens; Cardellach, Estel; Hoque, Mainul. (2023) Challenges for the PRETTY Satellite Mission: Characterizing Grazing Angle Ionospheric Effects in Space-borne GNSS Reflectometry. ESA-NRSCC GNSS-R
Konferanseforedrag

Nahavandchi, Hossein; Cardellach, Estel; Semmling, Maximilian; Hoseini, Mostafa; Wickert, Jens; Fragner, Heinz; Asgarimehr, Milad; Dielacher, Andreas; Moreno, Mario; Zus, Florian. (2023) ESA PRETTY CubeSat mission for precise altimetric determination of water and ice surfaces at grazing incidence angles. IEEE GNSS+R 2023

2022

Konferanseforedrag

Mohamadi, Ardeshir; Nahavandchi, Hossein. (2022) High-accuracy GNSS positioning for urban mobility and optimal transport solutions. GEOMATIKKDAGENE 2022

2021

Konferanseforedrag

Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramatschi, Markus; Goli, Mehdi; Haas, Rudiger; Wickert, Jens. (2021) PERFORMANCE ASSESSMENT OF POLARIMETRIC GNSS-R SEA LEVEL MONITORING IN THE PRESENCE OF SEA SURFACE ROUGHNESS. IEEE IGARSS 2021

2019

Konferanseforedrag

Shamshiri, Roghayeh; Haghshenas, Mahmud; Hoseini, Mostafa; Modiri, Sadegh; Nahavandchi, Hossein; Motagh, Mahdi. (2019) Large-scale Sentinel-1 InSAR analysis over Norway: Influence of atmospheric water vapour distribution. ESA Living Planet Symposium
Konferanseposter

Hoseini, Mostafa; Nahavandchi, Hossein; Asgarimehr, Milad; Wickert, Jens. (2019) Impact of sea surface temperature on GNSS-R observations over mesoscale ocean eddies: preliminary results from CYGNSS. IEEE GNSS+R 2019
Konferanseposter

Shamshiri, Roghayeh; Motagh, Mahdi; Nahavandchi, Hossein. (2019) A machine learning-based regression technique for prediction of tropospheric phase delay on large-scale Sentinel-1 InSAR time series. EGU General Assembly
Konferanseposter

Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Nahavandchi, Hossein; Wickert, Jens. (2019) A POLARIMETRIC PROCESSOR FOR GNSS REFLECTOMETRY AND ITS PROSPECT FOR OCEAN ALTIMETRY AND SEA ICE REMOTE SENSING. ESA ARSI + KEO

2018

Konferanseforedrag

Hoseini, Mostafa; Alshawaf, Fadwa; Dick, Galina; Wickert, Jens; Nahavandchi, Hossein. (2018) Analysis of GNSS atmospheric time series using subspace-based techniques for climate monitoring. IX Hotine-Marussi Symposium
Konferanseposter

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Hooper, Andy. (2018) A modified SqueeSAR approach for urban displacement monitoring with Sentinel-1 data. European Geosciences Union General Assembly 2018

2016

Konferanseforedrag

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Haghshenas, Mahmud. (2016) Multi-sensor InSAR analysis of surface displacement over Trondheim. CENTERIS Conference- SARWatch
Konferanseforedrag

Nahavandchi, Hossein. (2016) Infrastructure monitoring using SAR radar satellite data. Iran Construction Engineering Organization Professional Seminar
Foredrag

Nahavandchi, Hossein. (2016) Deformation analysis of urban areas using Interferometry SAR satellite data. Iran Construction Engineering Organization workshop
Konferanseforedrag

Nahavandchi, Hossein. (2016) Coordinate Systems- The foundation needed for Earth-system monitoring. The 1st Conference on Geospatial Information Technology (NCGIT)
Konferanseposter

Shamshiri, Roghayeh; Motagh, Mahdi; Nahavandchi, Hossein; Wetzel, Hans-Ulrich; Akbari, Bahman. (2016) Land subsidence monitoring in Rafsanjan plain, southeast Iran using multi-sensor InSAR data. NGU-dagen
Konferanseforedrag

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Stability assessment of roads and railways in Trondheim by using TerraSAR-X. TSX/TDX TerraSAR-X Science Team Meeting
Konferanseforedrag

Nahavandchi, Hossein; Shamshiri, Roghayeh. (2016) Infrastructure monitoring using SAR interferometry. Geodesi-og hydrografidagene
Konferanseposter

Hoseini, Mostafa; Asgarimehr, Milad; Nahavandchi, Hossein; Wickert, Jens. (2016) SPACEBORNE GNSS-R OBSERVATIONS OF MESOSCALE OCEAN EDDIES. IEEE IGARSS 2019 Symposium
Konferanseposter

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation Analysis of Trondheim city from SAR Interferometry. ESA Living planet symposium 2016

2014

Konferanseforedrag

Nahavandchi, Hossein; Schwartz, Vegard; Joodaki, Gholamreza. (2014) GRACE- beregning av ismassereduksjon på Grønland. Geomatikkdagene 2014

2013

Konferanseforedrag

Nahavandchi, Hossein. (2013) Are Global Gravity Models alone Accurate Enough for Height Determination using GPS?. Geodesi- og hydrografidagene
Konferanseforedrag

Nahavandchi, Hossein. (2013) Groundwater Level Estimation from GRACE Satellite Gravity Data. Geodesi- og hydrografidagene

2012

Konferanseforedrag

Nahavandchi, Hossein. (2012) Ocean Wave Measurement (Wave Height, Period and Direction)Using Single GPS Buoy. Geodesi- og Hydrografidagene
Konferanseforedrag

Nahavandchi, Hossein. (2012) Greenland Ice Mass Loss and Spread from GRACE Satellite Gravity Observations. Geodesi- og hydrografidagene
Konferanseposter

Joodaki, Gholamreza; Nahavandchi, Hossein; Ghazavi, Kourosh. (2012) Steric Sea Level Changes Using Altimetry and Gravimetry Satellites- A Case Study over Nordic Seas. 20 Years of Progress in Radar Altimetry

2010

Konferanseposter

Joodaki, Gholamreza; Nahavandchi, Hossein. (2010) Greenland mass balance estimation from satellite gravity measurements. The 2010 European Space Agency Living Planet Symposium

2007

Intervju

Nahavandchi, Hossein. (2007) Bremser forskningen.
Konferanseposter

Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny Iren; Ghazavi, K; Nahavandchi, Hossein. (2007) Updated OCTAS geoid - OCTAS07. European Geosciences Union General Assembly 2007
Konferanseposter

Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, J.A.; Nahavandchi, Hossein; Siegismund, F.; Ghazavi, K; Pettersen, Bjørn Ragnvald; Lysaker, Dagny Iren. (2007) The OCTAS project, the interrelationship between the geoid, the mean sea surface and the mean dynamic topography. European Geosciences Union, General Assembly 2007
Konferanseposter

Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Updated OCTAS geoid in the northern North Atlantic - OCTAS07. International Union of Geodesy and Geophysics (IUGG) XXIV 2007
Konferanseposter

Soltanpour, Ali; Nahavandchi, Hossein. (2007) Geoid-type surface computation for the improved determination of heights from global positioning systems. International Union of Geodesy and Geophysics (IUGG) XXIV 2007
Konferanseposter

Nahavandchi, Hossein; Shum, C.K.; Yi, Yochan; Omang, Ove Christian Dahl; Solheim, Dag. (2007) Ocean circulation with a focus on the importance of a high precision mean sea surface model. International Union of Geodesy and Geophysics (IUGG) XXIV 2007
Konferanseposter

Ghazavi, Kourosh; Nahavandchi, Hossein; Shum, C.K.; Yi, Yochan; Omang, Ove Christian Dahl; Solheim, Dag. (2007) Altimetric mean sea surface for the North Atlantic and the Arctic Sea. International Union of Geodesy and Geophysics (IUGG) XXIV 2007

2006

Konferanseforedrag

Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; Ghazavi, Kourosh; Siegismund, Frank; Pettersen, Bjørn Ragnvald; Lysaker, Dagny. (2006) The OCTAS project, the geoid, the mean sea surface and and the mean dynamic topography. Third International GOCE User Workshop
Konferanseforedrag

Soltanpour, Ali; Nahavandchi, Hossein. (2006) Altimetry-derived marine gravity anomaly and its impact to the geoid of Norway. Nordic Geodetic Commission General Assembly
Konferanseforedrag

Soltanpour, Ali; Nahavandchi, Hossein. (2006) Geoid and geoid-type surfaces determination in Norway. Nordic Geodetic Commission General Assembly
Konferanseforedrag

Solheim, Dag; Drange, Helge; Gidskehaug, Arne; Johannessen, Johnny; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, Bjørn Ragnvald; Plag, Hans-Peter. (2006) OCTAS: Ocean Circulation and Heat Transport between the North Atlantic and Arctic Sea. Nordic Geodetic Commission General Assembly
Konferanseforedrag

Solheim, Dag; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, Bjørn Ragnvald; Plag, Hans-Peter. (2006) Ocean Circulation and Transport between the North Atlantic and Arctic Sea -- status report 2006. Nordic Geodetic Commission General Assembly
Konferanseforedrag

Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2006) Ocean Circulation and Transport between the North Atlantic and Arctic Sea with a Focus on the Importance of a High Accuracy Geoid Model. 1st international Symposium of the international gravity field service, Gravity field of the Earth
Konferanseposter

Soltanpour, Ali; Nahavandchi, Hossein. (2006) How Second-Generation Wavelet Transform Can Improve the Results from Least- Squares Collocation- a Case Study over Norway. 1st International Symposium of the International Gravity Field Service, Gravity Field of the Earth
Konferanseposter

Nahavandchi, Hossein; Soltanpour, Ali. (2006) Different Geoidal Height Models over Iran with and Without Terrestrial Gravity Data. 1st international symposium of the international gravity field service, Gravity field of the Earth
Konferanseposter

Soltanpour, Ali; Nahavandchi, Hossein; Ghazavi, Kourosh. (2006) Recovery of marine gravity anomaly from ERS2 and ENVISAT data and its contribution to the geoid of Norway. European Geosciences Union General Assembly 2006
Konferanseposter

Soltanpour, Ali; Nahavandchi, Hossein. (2006) A new high-resolution geoid for Iran with emphasise on different modification procedures and new GRACE geopotential model. European Geosciences Uion General Assembly 2006
Konferanseposter

Soltanpour, Ali; Nahavandchi, Hossein; Featherstone, Will. (2006) Geoid-type surface determination using wavelet-based combination of gravimetric quasi/geoid and GPS-levelling data. European Geosciences Union General Assembly 2006
Konferanseforedrag

Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, J.A.; Nahavandchi, Hossein; Siegismund, Frank; Ghazavi, K; Pettersen, Bjørn Ragnvald; Lysaker, Dagny Iren. (2006) The Octas project, the geoid, the mean sea surface, and the mean dynamic topography. 3rd International GOCE User Workshop

2005

Konferanseposter

Solheim, Dag; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, B.; Plag, Hans-Peter. (2005) Ocean Circulation and Transport between the North Atlantic and Arctic Sea-status report 2005. General Assembly- European Geosciences Union
Konferanseposter

Solheim, Dag; Drange, Helge; Ghazavi, K; Gidskehaug, Arne; Johannessen, J.A.; Lysaker, Dagny Iren; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, Bjørn Ragnvald; Plag, Hans-Peter. (2005) Ocean Circulation and TRansport between the North Atlantic and Arctic Sea - status report 2005. European Geosciences Union 2005
Konferanseforedrag

Nyrnes, Erik; Torkildsen, Torgeir; Nahavandchi, Hossein. (2005) Analyses of the Accuracy and Reliability of Magnetic Directional Surveys. SPE/IADC Middle East Drilling Technology Conference and Exhibition
Konferanseforedrag

Nyrnes, Erik; Torkildsen, Torgeir; Nahavandchi, Hossein. (2005) Error Properties of Magnetic Directional Surveying Data. SPWLA 46th Annual Logging Symposium
Konferanseposter

Solheim, Dag; Drange, Helge; Ghazavi, K; Gidskehaug, Arne; Johannessen, J.A.; Lysaker, Dagny Iren; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, Bjørn Ragnvald; Plag, Hans-Peter. (2005) Ocean Circulation and Transport between the North Atlantic and Arctic Sea --- status report 2005. EGU Generaly Assembly

2004

Konferanseforedrag

Nahavandchi, Hossein; Soltanpour, Ali. (2004) An Attempt to Define a New Height-Datum in Norway. Geodesi- og hydrografidagene 2004
Konferanseposter

Nahavandchi, Hossein; Soltanpour, Ali; Nyrnes, Erik. (2004) New Gravimetric Geoidal Height Model over Norway Computed by the Least-Squares Modification Parameters. IAG International Symposium-Gravity, Geoid and Space Missions - GGSM2004
Konferanseposter

Nahavandchi, Hossein; Soltanpour, Ali. (2004) Adjustment of the Surface of the Gravimetric Geoidal Height Model between Constrained GPS-levelling Stations. IAG International Symposium- Gravity, Geoid and Space Missions - GGSM2004
Konferanseposter

Nahavandchi, Hossein; Soltanpour, Ali. (2004) Impact of the New GRACE Global Geopotential Model to the Geoidal Height Modeling over Norway. IAG International Symposium-Gravity, Geoid and Space Missions - GGSM2004
Konferanseposter

Solheim, Dag; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein; Omang, Ove Christian Dahl. (2004) Existing and new Mean Dynamic Topography, Mean Sea Surface and geiod models in the Northern North Atlantic. General Assembly-European Geosciences Union (EGU)
Konferanseposter

Nahavandchi, Hossein; Haakonsen, Trond Arve; Plag, Hans-Peter. (2004) Principle component analysis of the Norwegian permanent GPS stations. General Assembly- European Geosciences Union (EGU)
Konferanseposter

Nahavandchi, Hossein; Haakonsen, Trond Arve. (2004) Correlation and spectral analysis of the Norwegian permanent GPS stations using a least-squares procedure. General Assembly- European Geosciences Union
Konferanseposter

Solheim, Dag; Drange, Helge; Johannessen, J.A.; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Plag, Hans-Peter. (2004) Existing and new synthetic Mean Dynamic Topography, Mean Sea Surface and geoid models in the Northern North Atlantic. 1st EGU General Assembly 2004
Konferanseposter

Solheim, Dag; Drange, Helge; Johannessen, J.A.; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Plag, Hans-Peter. (2004) Validation and Analysis of the Models for the Mean Dynamic Topography, the Mean Sea Surface Height and the Geoid in the Northern North Atlantic. Forskerkonferanse for KlimaProg, KlimaEffekter og Polar klimaforskning
Konferanseposter

Plag, Hans-Peter; Plag, Hans-Peter; Drange, Helge; Drange, Helge; Gidskehaug, Arne; Gidskehaug, Arne; Johannessen, J.A.; Johannessen, J.A.; Nahavandchi, Hossein; Nahavandchi, Hossein. (2004) OCTAS: Ocean Circulation and Heat Transport Between the North Atlantic and Arctic Sea. Forskerkonferanse for KlimaProg, KlimaEffekter og Polar klimaforskning
Konferanseposter

Plag, Hans-Peter; Drange, Helge; Gidskehaug, Arne; Johannessen, J.A.; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Pettersen, Bjørn Ragnvald; Solheim, Dag. (2004) OCTAS: Ocean Circulation and Heat Transport Between the North Atlantic and Arctic Sea. Forskerkonferanse for KlimaProg, KlimaEffekter og Polar klimaforskning
Konferanseposter

Solheim, Dag; Drange, Helge; Johannessen, J.A.; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Plag, Hans-Peter. (2004) Validation and Analysis of the Models for the Mean Dynamic Topography, the Mean Sea Surface Height and the Geoid in the Northern North Atlantic. Forskerkonferanse for KlimaProg, KlimaEffekter og Polar klimaforskning

2003

Konferanseposter

Nahavandchi, Hossein. (2003) Improved direct atmospheric correction in gravimetric geoid computations. EGS-AGU-EUG Joint Assembly Scientific
Konferanseposter

Nahavandchi, Hossein; Plag, Hans-Peter. (2003) Determination of the error spectrum of continuous GPS observations. EGS-AGU-EUG Joint Assembly
Konferanseforedrag

Nahavandchi, Hossein. (2003) How to compute a precise geoid and why it is important. Geodesi- og hydrografidagene 2003
Konferanseforedrag

Nahavandchi, Hossein. (2003) Temporal Charactristics of Multipath effects in GPS-Code and Carrier phase observations. Geodesi- og hydrografidagene 2003
Konferanseforedrag

Plag, Hans-Peter; Plag, Hans-Peter; Drange, Helge; Drange, Helge; Gidskehaug, Arne; Gidskehaug, Arne; Johannessen, J.A.; Johannessen, J.A.; Nahavandchi, Hossein; Nahavandchi, Hossein. (2003) Ocean Circulation and Heat Transport between the North Atlantic and Arctic Sea. The 23th General Assembly of the International Union of Geodesy and Geophysics
Konferanseforedrag

Plag, Hans-Peter; Drange, Helge; Gidskehaug, Arne; Johannessen, J.A.; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag. (2003) Ocean Circulation and Heat Transport between the North Atlantic and Arctic Sea. The 23th General Assembly of the International Union of Geodesy and Geophysics
Konferanseforedrag

Nahavandchi, Hossein. (2003) Evaluation of different methods for modification of Stokes�s integral. Geodesy Week 2003

2002

Konferanseforedrag

Nahavandchi, Hossein. (2002) Research Activities in Geodesy at Department of Geomatics, NTNU. Geodesi -og Hydrografidagene 2002

2000

Konferanseposter

Nahavandchi, Hossein. (2000) A robust least-squares estimation technique for the combined adjustment of gravimetric geoid at GPS-leveling stations. European Geophysical Society General Assembly
Konferanseforedrag

Nahavandchi, Hossein. (2000) A new strategy for the direct terrain correction in Stokes-Helmert Scheme. European Geophysical Society General Assembly

1999

Konferanseforedrag

Nahavandchi, Hossein. (1999) Unification of Vertical Datums with Application to Asia and the Pacific. Second workshop on Regional Geodetic Network
Konferanseforedrag

Nahavandchi, Hossein. (1999) Terrain correction computations with Sjoberg's and integral formulae. European Geophysical Society XXIII General Assembly

1998

Konferanseforedrag

Nahavandchi, Hossein. (1998) A comparison of classical and Sjoberg's approaches to terrain corrections in gravimetric geoid determination. European Geophysical Society XXIII Assembly

1992

Konferanseforedrag

Nahavandchi, Hossein. (1992) The use of Spot satellite imagery for the revision of maps in Iran. First International Conference on Surveying and Mapping

Språkvelger

Hossein Nahavandchi