Hossein Nahavandchi

About

Hossein Nahavandchi is a professor of geodesy. His research interest is Earth/climate change monitoring using satellite data, and high precision GNSS positioning on smartphone/u-blox .

Biography: Hossein Nahavandchi holds a PhD degree (1998) from Royal Institute of Technology (KTH) in Stockholm. His primary research interest is satellite geodesy and GPS. He has been lecturing in the Geomatics and Geodesy fields since 1990. Since 2004 he is Professor for Geodesy and Geophysics at Norwegian University of Science and Technology (NTNU). He also worked for the National Mapping Authority in several functions. He was Head of Department, Vice-Dean, Dean, and the Rector of the College of Engineering, Director of Research and Planning division, Chair of the Borad and Board member of Research and Planning division, and Chair of the Borad and Board member of Education department. His research projects and other activities in Civil Engineering have attracted more than 120 million NOK to the university sector since 1991. They have also resulted in a strong international network. Over 155 publications and presentations are the results of his research projects.

Research

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 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.

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.

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.

CentiNav: 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 cm-level accuracy even with low-cost receivers like smartphones and u-blox.

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.

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.

Publications

2023

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

2022

Safdari, Zohreh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2022) Estimation of Groundwater Depletion in Iran’s Catchments Using Well Data. Water
Academic article
Hoseini, Mostafa; Nahavandchi, Hossein. (2022) The potential of spaceborne GNSS reflectometry for detecting ocean surface currents. Remote Sensing of Environment
Academic article
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. Springer
Academic chapter/article/Conference paper

2021

Asgarimehr, Milad; Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Camps, Adriano; Nahavandchi, Hossein. (2021) Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations. IEEE Transactions on Geoscience and Remote Sensing
Academic article
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximillian; Ramatschi, Markus; Goli, Mehdi. (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
Academic article
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramaschi, Markus; Goli, Mehdi. (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
Academic article
Hoseini, Mostafa; Semmling, Maximilian; Nahavandchi, Hossein; Rennspiess, Erik; Ramatschi, Markus; Haas, Rüdiger. (2021) On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness. IEEE Transactions on Geoscience and Remote Sensing
Academic article

2017

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

2016

Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry.
Academic chapter/article/Conference paper
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
Academic article
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry . ESA SP
Academic article

2015

Nahavandchi, Hossein; Joodaki, Gholamreza; Schwartz, Vegar. (2015) GRACE-derived ice-mass loss spread over Greenland. Journal of Geodetic Science
Academic article
Nahavandchi, Hossein; Skogseth, Terje. (2015) Klimaovervåking med satellitter. Byggeindustrien
Article in business/trade/industry journal

2014

Joodaki, Gholamreza; Nahavandchi, Hossein. (2014) Earth Mass Change Tracking Using GRACE Satellite Gravity Data. Doktoravhandlinger ved NTNU (2014:34)
Doctoral dissertation

2013

Borge, Aina; Nahavandchi, Hossein. (2013) Geoid determination over Norway using global Earth gravity models. NTNU
Masters thesis
Joodaki, Gholamreza; Nahavandchi, Hossein; Cheng, Kevin. (2013) Ocean Wave Measurement Using GPS Buoys. Journal of Geodetic Science
Academic article
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
Academic article
Joodaki, Gholamreza; Nahavandchi, Hossein; Ghazavi, Kourosh. (2013) Steric sea level changes from ENVISAT and GRACE in the Nordic Seas. ESA SP
Academic article

2012

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
Academic article
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass loss of the Greenland ice sheet from GRACE time-variable gravity measurements. Studia Geophysica et Geodaetica
Academic article
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
Academic article
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
Academic article

2011

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

2010

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

2009

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

2008

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
Academic article
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. Doktoravhandlinger ved NTNU (2008:180)
Doctoral dissertation
Prebensen Korsnes, Andreas; Nahavandchi, Hossein. (2008) Availability and Correlation analysis of GNSS data . Tapir NTNU
Masters thesis
Nahavandchi, Hossein; Soltanpour, Ali. (2008) Local ionospheric modelling of GPS code and carrier phase observations. Survey Review
Academic article

2007

Soltanpour, Ali; Solheim, Dag; Omang, Ove Christian Dahl; Nahavandchi, Hossein; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald. (2007) Assessment and Validation of the geoid, MSS and MDT models in the OCTAS project. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) The OCTAS07- North Atlantic/Arctic ocean mean sea surface model based on a wavelet adjustment of multiple satellite altimetry data. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) OCTAS with a focus on the importance of a high precision mean sea surface. Geophysical Research Abstracts
Abstract
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Soltanpour, Ali; Drange, Helge; Nahavandchi, Hossein. (2007) The OCTAS project, the interrelationship between the geoid, the mean sea surface and the mean dynamic topography. Geophysical Research Abstracts
Abstract
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Updated OCTAS geoid – OCTAS07. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl ; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) The OCTAS06-North Atlantic/Arctic ocean mean sea surface model. Geophysical Research Abstracts
Abstract
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
Academic article
Nahavandchi, Hossein; Soltanpour, Ali. (2007) Different Gravimetric Geoid Models over Iran with and without Terrestrial Gravity Data. General Command of Mapping
Academic article
Soltanpour, Ali; Nahavandchi, Hossein. (2007) Geoid and Geoid-type Surface Determination- Improved Determination of Heights from Global Positioning System. Tapir Akademisk Forlag Doktoravhandlinger ved NTNU (24)
Doctoral dissertation
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.
Academic chapter/article/Conference paper
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein. (2007) The OCTAS poject, The geoid, the mean sea surface and the mean dynamic topography. European Space Agency
Academic chapter/article/Conference paper
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
Academic article
Vangen, Vibeke; Nahavandchi, Hossein. (2007) Error Budget in Seabed Mapping. NTNU
Masters thesis
Evanger, Kim; Nahavandchi, Hossein. (2007) Investigation of Applanix POS Post-Process Package (POSPac) for GPS/INS Positioning/Navigation system. NTNU
Masters thesis

2006

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
Abstract
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
Abstract
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
Abstract
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
Academic article
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
Academic article
Nyrnes, Erik; Nahavandchi, Hossein. (2006) Error Analyses and Quality Control of Wellbore Directional Surveys. Tapir Akademisk Forlag Tapir Akademisk Forlag
Doctoral dissertation
Nahavandchi, Hossein. (2006) HIGH-RESOLUTION GEOID DETERMINATION- IRanian Gravimetric Geoid 2005 (IRGG05). National Cartographic Center of Iran
Report
Fløisbonn, Håkon Solhaug; Nahavandchi, Hossein. (2006) Time Series Analysis of Real Time GPS-data. NTNU
Masters thesis

2005

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
Academic article
Haakonsen, Trond Arve; Nahavandchi, Hossein; Plag, Hans-Peter. (2005) Temporal and Spatial Analyses of Continuous GPS Observations. NTNU
Doctoral dissertation
Pettersen, Øystein; Nahavandchi, Hossein. (2005) Spektralanalyse av kontinuerlige GPS-målinger. NTNU
Masters thesis
Eide, Trond Petter; Nahavandchi, Hossein. (2005) Analyse og modellering av ionosfærisk feil ved permanente GPS stasjoner. NTNU
Masters thesis

2004

Nahavandchi, Hossein. (2004) A new strategy for the atmospheric gravity effect in gravimetric geoid determination. Journal of Geodesy
Academic article
Nahavandchi, Hossein. (2004) The Quest for a Precise Geoidal Height Model. Kart og Plan
Academic article
Nahavandchi, Hossein. (2004) The direct effect and downward continuation correction of atmospheric masses in gravimetric geoid determination. Bollettino di Geodesia e Scienze Affini
Academic article
Huser, Helge; Nahavandchi, Hossein. (2004) An Investigation to the GPS data processing using GAMIT/GLOBK and GIPSY-OASIS II Scientific software Package. NTNU
Masters thesis
Nahavandchi, Hossein; Soltanpour, Ali; Nyrnes, Erik. (2004) A New Gravimetric Geoidal Height Model over Norway Computed by the Least-Squares Modification Parameters. Springer Publishing Company
Other

2003

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
Errata
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
Academic article
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
Academic article

2002

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
Academic article

2001

Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Academic article
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
Academic article
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
Academic article
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Academic article
Nahavandchi, Hossein. (2001) Physical Geodesy. Department of Geomatics
Compendium

2000

Sjöberg, Lars Erik; Nahavandchi, Hossein. (2000) The atmospheric geoid effects in Stokes’ formula. Geophysical Journal International
Academic article
Nahavandchi, Hossein. (2000) Computation of mean free-air gravity anomalies by Bjerhammar's deterministic and collocation methods over Scandinavia. Survey Review
Academic article
Nahavandchi, Hossein. (2000) The direct topographical correction in gravimetric geoid determination by the Stokes-Helmert method. Journal of Geodesy
Academic article

1999

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

1998

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

1997

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

1996

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

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
Academic article

1994

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

1993

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

Journal publications

Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Asgarimehr, Milad; Semmling, Maximilian; Ramatschi, Markus. (2023) Tidal harmonics retrieval using GNSS-R dual-frequency complex observations. Journal of Geodesy
Academic article
Safdari, Zohreh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2022) Estimation of Groundwater Depletion in Iran’s Catchments Using Well Data. Water
Academic article
Hoseini, Mostafa; Nahavandchi, Hossein. (2022) The potential of spaceborne GNSS reflectometry for detecting ocean surface currents. Remote Sensing of Environment
Academic article
Asgarimehr, Milad; Hoseini, Mostafa; Semmling, Maximilian; Ramatschi, Markus; Camps, Adriano; Nahavandchi, Hossein. (2021) Remote Sensing of Precipitation Using Reflected GNSS Signals: Response Analysis of Polarimetric Observations. IEEE Transactions on Geoscience and Remote Sensing
Academic article
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximillian; Ramatschi, Markus; Goli, Mehdi. (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
Academic article
Rajabi, Mahmoud; Hoseini, Mostafa; Nahavandchi, Hossein; Semmling, Maximilian; Ramaschi, Markus; Goli, Mehdi. (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
Academic article
Hoseini, Mostafa; Semmling, Maximilian; Nahavandchi, Hossein; Rennspiess, Erik; Ramatschi, Markus; Haas, Rüdiger. (2021) On the Response of Polarimetric GNSS-Reflectometry to Sea Surface Roughness. IEEE Transactions on Geoscience and Remote Sensing
Academic article
Rajabi, Mahmoud; Amiri-Simkooei, Alireza; Nahavandchi, Hossein; Nafisi, Vahab. (2020) Modeling and Prediction of Regular Ionospheric Variations and Deterministic Anomalies. Remote Sensing
Academic article
Hoseini, Mostafa; Alshawaf, Fadwa; Nahavandchi, Hossein; Dick, Galina; Wickert, Jens. (2020) Towards a zero-difference approach for homogenizing GNSS tropospheric products. GPS Solutions
Academic article
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
Academic article
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
Academic article
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
Academic article
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
Academic article
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
Academic article
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
Academic article
Motagh, Mahdi; Shamshiri, Roghayeh; Haghshenas, Mahmud; Wetzel, Hans-Ulrich; Akbari, Bahman; Nahavandchi, Hossein. (2017) Quantifying groundwater exploitation induced subsidence in the Rafsanjan plain, southeastern Iran, using InSAR time-series and in situ measurements. Engineering Geology
Academic article
Nahavandchi, Hossein; Haakonsen, Trond Arve; Aas, Håvard. (2017) Accuracy investigation of UAV Photomapping. Kart og Plan
Academic article
Shamshiri, Roghayeh; Nahavandchi, Hossein; Joodaki, Gholamreza. (2017) Seasonal variation analysis of Greenland ice mass time-series. Acta Geodaetica et Geophysica Hungarica
Academic article
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
Academic article
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry . ESA SP
Academic article
Nahavandchi, Hossein; Joodaki, Gholamreza; Schwartz, Vegar. (2015) GRACE-derived ice-mass loss spread over Greenland. Journal of Geodetic Science
Academic article
Nahavandchi, Hossein; Skogseth, Terje. (2015) Klimaovervåking med satellitter. Byggeindustrien
Article in business/trade/industry journal
Joodaki, Gholamreza; Nahavandchi, Hossein; Cheng, Kevin. (2013) Ocean Wave Measurement Using GPS Buoys. Journal of Geodetic Science
Academic article
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
Academic article
Joodaki, Gholamreza; Nahavandchi, Hossein; Ghazavi, Kourosh. (2013) Steric sea level changes from ENVISAT and GRACE in the Nordic Seas. ESA SP
Academic article
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
Academic article
Joodaki, Gholamreza; Nahavandchi, Hossein. (2012) Mass loss of the Greenland ice sheet from GRACE time-variable gravity measurements. Studia Geophysica et Geodaetica
Academic article
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
Academic article
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
Academic article
Ghazavi, Kourosh; Nahavandchi, Hossein. (2011) Mean Sea Surface and ocean circulation in North Atlantic and the Arctic Sea. Journal of Geodetic Science
Academic article
Nahavandchi, Hossein; Joodaki, Gholamreza. (2010) CORRELATION ANALYSIS OF MULTIPATH EFFECTS IN GPS-CODE AND CARRIER PHASE OBSERVATIONS. Survey Review
Academic article
Joodaki, Gholamreza; Nahavandchi, Hossein. (2010) Greenland mass balance estimation from satellite gravity measurements. ESA SP
Academic article
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
Academic article
Nahavandchi, Hossein; Soltanpour, Ali. (2008) Local ionospheric modelling of GPS code and carrier phase observations. Survey Review
Academic article
Soltanpour, Ali; Solheim, Dag; Omang, Ove Christian Dahl; Nahavandchi, Hossein; Ghazavi, Kourosh; Pettersen, Bjørn Ragnvald. (2007) Assessment and Validation of the geoid, MSS and MDT models in the OCTAS project. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) The OCTAS07- North Atlantic/Arctic ocean mean sea surface model based on a wavelet adjustment of multiple satellite altimetry data. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) OCTAS with a focus on the importance of a high precision mean sea surface. Geophysical Research Abstracts
Abstract
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Soltanpour, Ali; Drange, Helge; Nahavandchi, Hossein. (2007) The OCTAS project, the interrelationship between the geoid, the mean sea surface and the mean dynamic topography. Geophysical Research Abstracts
Abstract
Omang, Ove Christian Dahl; Solheim, Dag; Hunegnaw, Addisu; Lysaker, Dagny; Ghazavi, Kourosh; Nahavandchi, Hossein. (2007) Updated OCTAS geoid – OCTAS07. Geophysical Research Abstracts
Abstract
Ghazavi, Kourosh; Nahavandchi, Hossein; Omang, Ove Christian Dahl ; Solheim, Dag; Soltanpour, Ali; Shum, C.K.. (2007) The OCTAS06-North Atlantic/Arctic ocean mean sea surface model. Geophysical Research Abstracts
Abstract
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
Academic article
Nahavandchi, Hossein; Soltanpour, Ali. (2007) Different Gravimetric Geoid Models over Iran with and without Terrestrial Gravity Data. General Command of Mapping
Academic article
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
Academic article
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
Abstract
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
Abstract
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
Abstract
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
Academic article
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
Academic article
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
Academic article
Nahavandchi, Hossein. (2004) A new strategy for the atmospheric gravity effect in gravimetric geoid determination. Journal of Geodesy
Academic article
Nahavandchi, Hossein. (2004) The Quest for a Precise Geoidal Height Model. Kart og Plan
Academic article
Nahavandchi, Hossein. (2004) The direct effect and downward continuation correction of atmospheric masses in gravimetric geoid determination. Bollettino di Geodesia e Scienze Affini
Academic article
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
Errata
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
Academic article
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
Academic article
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
Academic article
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Academic article
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
Academic article
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
Academic article
Nahavandchi, Hossein; Sjöberg, Lars Erik. (2001) Precise geoid determination over Sweden using the Stokes-Helmert method and improved topographic corrections. Journal of Geodesy
Academic article
Sjöberg, Lars Erik; Nahavandchi, Hossein. (2000) The atmospheric geoid effects in Stokes’ formula. Geophysical Journal International
Academic article
Nahavandchi, Hossein. (2000) Computation of mean free-air gravity anomalies by Bjerhammar's deterministic and collocation methods over Scandinavia. Survey Review
Academic article
Nahavandchi, Hossein. (2000) The direct topographical correction in gravimetric geoid determination by the Stokes-Helmert method. Journal of Geodesy
Academic article
Sjöberg, Lars Erik; Nahavandchi, Hossein. (1999) On the indirect effect in the Stokes-Helmert method of geoid determination. Journal of Geodesy
Academic article
Nahavandchi, Hossein. (1999) Geoid terrain correction to power H (super 5) of satellite derived geopotential models. Bollettino di Geodesia e Scienze Affini
Academic article
Nahavandchi, Hossein. (1999) Terrain correction computations by spherical harmonics and integral formulas. Physics and chemistry of the earth. Part A: Solid earth and geodesy
Academic article
Nahavandchi, Hossein. (1998) On some methods of downward continuation of mean free-air gravity anomaly. IGeS Bulletin
Academic article
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Terrain corrections to power H3 in gravimetric geoid determination. Journal of Geodesy
Academic article
Nahavandchi, Hossein; Sjöberg, Lars Erik. (1998) Unification of vertical datums by GPS and gravimetric geoid models using modified Stokes formula. Marine Geodesy
Academic article
Nahavandchi, Hossein. (1997) The Atmospheric Geoid effects over Iran. Scientific and Technical Quarterly Journal of NCC
Academic article
Nahavandchi, Hossein. (1997) Terrain effects in geoid determination over Iran. Scientific and Technical Quarterly Journal of NCC
Academic article
Nahavandchi, Hossein. (1997) Connection of vertical datums using geoid models. Scientific and Technical Quarterly Journal of NCC
Academic article
Nahavandchi, Hossein. (1996) Determination of Spherical Harmonics coefficients by Integral Formula and Collocation method. Scientific and Technical Quarterly Journal of NCC
Academic article
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
Academic article
Nahavandchi, Hossein. (1993) Geoid Determination with geometrical methods. Scientific and Technical Journal of NGO
Academic article

Part of book/report

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. Springer
Academic chapter/article/Conference paper
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi. (2016) Deformation analysis of the Trondheim city from SAR Interferometry.
Academic chapter/article/Conference paper
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.
Academic chapter/article/Conference paper
Solheim, Dag; Omang, Ove Christian Dahl; Hunegnaw, Addisu; Drange, Helge; Johannessen, Johnny; Nahavandchi, Hossein. (2007) The OCTAS poject, The geoid, the mean sea surface and the mean dynamic topography. European Space Agency
Academic chapter/article/Conference paper
Nahavandchi, Hossein; Soltanpour, Ali; Nyrnes, Erik. (2004) A New Gravimetric Geoidal Height Model over Norway Computed by the Least-Squares Modification Parameters. Springer Publishing Company
Other

Report

Joodaki, Gholamreza; Nahavandchi, Hossein. (2014) Earth Mass Change Tracking Using GRACE Satellite Gravity Data. Doktoravhandlinger ved NTNU (2014:34)
Doctoral dissertation
Borge, Aina; Nahavandchi, Hossein. (2013) Geoid determination over Norway using global Earth gravity models. NTNU
Masters thesis
Skeset, Lars; Nahavandchi, Hossein. (2010) Bestemmelse av høydereferansemodell ved bruk av gravimetrisk geoidemodell og GNSS/nivellementsdata. NTNU
Masters thesis
Hervig, Lars; Nahavandchi, Hossein. (2009) En analyse av GNSS tilgjenglighet og nøyaktighet i Norge ved bruk av GPS og Galileo. NTNU
Masters thesis
Østerbø, Øystein Kvaal; Nahavandchi, Hossein. (2009) Korrelasjonsanalyse av sanntids GNSS-data. NTNU
Masters thesis
Taraldsten Brunes, Morten; Nahavandchi, Hossein. (2009) Beregning og analyse av relativ og absolutt GPS fasesentervariasjon. NTNU
Masters thesis
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. Doktoravhandlinger ved NTNU (2008:180)
Doctoral dissertation
Prebensen Korsnes, Andreas; Nahavandchi, Hossein. (2008) Availability and Correlation analysis of GNSS data . Tapir NTNU
Masters thesis
Soltanpour, Ali; Nahavandchi, Hossein. (2007) Geoid and Geoid-type Surface Determination- Improved Determination of Heights from Global Positioning System. Tapir Akademisk Forlag Doktoravhandlinger ved NTNU (24)
Doctoral dissertation
Vangen, Vibeke; Nahavandchi, Hossein. (2007) Error Budget in Seabed Mapping. NTNU
Masters thesis
Evanger, Kim; Nahavandchi, Hossein. (2007) Investigation of Applanix POS Post-Process Package (POSPac) for GPS/INS Positioning/Navigation system. NTNU
Masters thesis
Nyrnes, Erik; Nahavandchi, Hossein. (2006) Error Analyses and Quality Control of Wellbore Directional Surveys. Tapir Akademisk Forlag Tapir Akademisk Forlag
Doctoral dissertation
Nahavandchi, Hossein. (2006) HIGH-RESOLUTION GEOID DETERMINATION- IRanian Gravimetric Geoid 2005 (IRGG05). National Cartographic Center of Iran
Report
Fløisbonn, Håkon Solhaug; Nahavandchi, Hossein. (2006) Time Series Analysis of Real Time GPS-data. NTNU
Masters thesis
Haakonsen, Trond Arve; Nahavandchi, Hossein; Plag, Hans-Peter. (2005) Temporal and Spatial Analyses of Continuous GPS Observations. NTNU
Doctoral dissertation
Pettersen, Øystein; Nahavandchi, Hossein. (2005) Spektralanalyse av kontinuerlige GPS-målinger. NTNU
Masters thesis
Eide, Trond Petter; Nahavandchi, Hossein. (2005) Analyse og modellering av ionosfærisk feil ved permanente GPS stasjoner. NTNU
Masters thesis
Huser, Helge; Nahavandchi, Hossein. (2004) An Investigation to the GPS data processing using GAMIT/GLOBK and GIPSY-OASIS II Scientific software Package. NTNU
Masters thesis
Nahavandchi, Hossein. (2001) Physical Geodesy. Department of Geomatics
Compendium
Nahavandchi, Hossein. (1998) Precise Gravimetric-GPS Geoid Determination with Improved Topographic Corrections Applid over Sweden. Department of Geodesy and Photogrammetry, KTH
Doctoral dissertation
Nahavandchi, Hossein. (1994) Compilation of 10' by 10' mean gravity anomalies in Iran. K.N.Toosi University of Technology
Masters thesis

Teaching

Courses

Knowledge Transfer

2024

Academic lecture

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. IEEE International Conference on Electromagnetics in Advanced Applications , Lisbon 2024-09-02 - 2024-09-06
Academic lecture

Semmling, Maximilian; Moreno, Mario; Zus, Florian; Hoque, Mainul; Wickert, Jens; Nahavandchi, Hossein. (2024) Ionospheric impact on space-borne GNSS reflectometry: studying satellite and sounding rocket scenarios. The German Aerospace Center National Space Weather Workshop 2024 , Neustrelitz 2024-09-24 - 2024-09-26
Lecture

Nahavandchi, Hossein; Hoseini, Mostafa; Rajabi, Mahmoud. (2024) NTNU’s CubeSat initiative and projects. International Association of Geodesy IAG Academic presentation , Berlin 2024-01-15 - 2024-01-15
Poster

Semmling, Maximilian; Li, Weiqiang; Zus, Florian; Hoseini, Mostafa; Moreno, Mario; Nahavandchi, Hossein. (2024) Building a comprehensive picture of sea surface, troposphere and ionosphere contributions in precise GNSS reflectometry from space . The European Geosciences Union EGU General Assembly 2024 , Vienna 2024-04-14 - 2024-04-19
Academic lecture

Dielacher, Andreas; Moser-Moritsch, Michael; Hoermanseder, Walter; Semmling, Maximilian; Li, Weiqiang; Nahavandchi, Hossein. (2024) PRETTY – First experience from a 3U CubeSat In-Orbit Demonstrator for GNSS-Reflectometry under grazing angle geometry. The European Geosciences Union EGU General Assembly 2024 , Vienna 2024-04-14 - 2024-04-19
Academic lecture

Cardellach, Estel; Li, Weiqiang; Nahavandchi, Hossein; Semmling, Maximilian; Moreno, Mario; Hoque, Mainul. (2024) PRECISE GNSS-R ALTIMETRY WITH THE ESA PRETTY CUBESAT: INITIAL IN-ORBIT RESULTS. IEEE IEEE International Geoscience and Remote Sensing Symposium , Athens 2024-07-07 - 2024-07-12