Browsing NTNU Open by Author "Nahavandchi, Hossein"
Now showing items 1-20 of 69
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A Big Data Approach to Generate Training Data for Automatic Ship Detection - An Integration of AIS and Sentinel-2 MSI
Berg-Jensen, Lars Henrik; Tofting, Adrian (Master thesis, 2018)A fast and scalable approach to combine global satellite images with ship navigational messages In this project, we have developed a data processing pipeline that combines multiple sources of data in order to automate the ... -
Accuracy investigation of UAV Photomapping
Nahavandchi, Hossein; Haakonsen, Trond Arve; Aas, Håvard (Peer reviewed; Journal article, 2017)Drone systems are high-technology products which can also be used for mapping. Drone mapping has recently become very popular for producing orthophoto maps, terrain models and 3D-data over small areas. A test area located ... -
Analyse av posisjonsdata fra GNSS-mottakere på kjøretøy
Oppedal, Eirik (Master thesis, 2018)Kodebaserte GNSS-mottakere kan være fremtiden til bilnavigasjonssystemer, ettersom de kan levere robuste målinger med god nøyaktighet til en lav pris. Dersom GNSS-mottakeren har tilstrekkelig nøyaktighet til å kunne fastslå ... -
Assessment of GNSS Reflectometry's Capability to Predict the Global Distribution of Floating Ocean Microplastics
Kok, Syver Stenersen (Master thesis, 2022)Plastikkforurensing i havet påvirker maritimt liv og kan spores videre til mange deler av næringskjeden. Det er vanskelig å nøyaktig anslå hvor store skader økosystemet tar av mikroplastforurensingen av verdenshavene. Nylig ... -
A Big Data Approach to Generate Training Data for Automatic Ship Detection - An Integration of AIS and Sentinel-2 MSI
Berg-Jensen, Lars Henrik; Tofting, Adrian (Master thesis, 2018)A fast and scalable approach to combine global satellite images with ship navigational messages In this project, we have developed a data processing pipeline that combines multiple sources of data in order to automate the ... -
Climate and Environmental Monitoring using GNSS Remote Sensing
Rajabbi, Mahmoud (Doctoral theses at NTNU;2024:209, Doctoral thesis, 2024)The potential of Global Navigation Satellite System (GNSS) signals for remote sensing applications has been widely recognized. The widespread availability of GNSS signals, whether in direct form or as reflections, enables ... -
A Comparison of the classical and recent formulae of handling the effects of close and distant topographic masses in gravimetric geoid computations
Nahavandchi, Hossein (Journal article; Peer reviewed, 2003)Different procedures for considering the effects of topographic masses in Stokes- Helmert scheme of geoid determination are reviewed. Classical integral formulae use a planar approximation of the geoid and a limited area ... -
Correlation Analysis of Multipath Effects in GPS-Code and Carrier Phase Observations
Nahavandchi, Hossein; Joodaki, Gholamreza (Peer reviewed; Journal article, 2010)Multipath error is a limiting factor for successful ambiguity resolution in precise real-time kinematic GPS positioning, both in the carrier phase and pseudorange measurements. Understanding the temporal characteristics ... -
Deformation analysis of the Trondheim city from SAR Interferometry
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi (Peer reviewed; Journal article, 2016)Trondheim is a coastal city in central Norway, which lies on the south shore of the Trondheim Fjord. Because of the river Nidelva, which runs through the city, floods, erosion and landslides, are occurring in and along the ... -
Detection of Gross Errors in Wellbore Directional Surveying for Petroleum Production with emphasis on Reliability Analyses
Nyrnes, Erik; Torkildsen, Torgeir; Nahavandchi, Hossein (Peer reviewed; Journal article, 2005)This paper presents a method for the detection of gross errors in wellbore directional survey data. The method is general, and is applicable for both magnetic and gyroscopic surveys. However, this study will only examine ... -
The direct effect and downward continuation correction of atmospheric masses in gravimetric geoid determination
Nahavandchi, Hossein (Peer reviewed; Journal article, 2004)A new procedure to the direct atmospheric gravity effect in connection with Stokes's integral formula was presented by Nahavandchi (2002). This formula was derived by combining the local contributions of the effect of ... -
The direct topographical correction in gravimetric geoid determination by the Stokes-Helmert method
Nahavandchi, Hossein (Peer reviewed; Journal article, 2000)The direct topographical correction is composed of both local effects and long-wavelength contributions. This implies that the classical integral formula for determining the direct effect may have some numerical problems ... -
Efficient Ground Surface Displacement Monitoring Using Sentinel-1 Data: Integrating Distributed Scatterers (DS) Identified Using Two-Sample t-Test with Persistent Scatterers (PS)
Shamshiri, Roghayeh; Nahavandchi, Hossein; Motagh, Mahdi; Andy, Hooper (Journal article; Peer reviewed, 2018)Combining persistent scatterers (PS) and distributed scatterers (DS) is important for effective displacement monitoring using time-series of SAR data. However, for large stacks of synthetic aperture radar (SAR) data, the ... -
Estimation of Groundwater Depletion in Iran’s Catchments Using Well Data
Safdari, Zohreh; Nahavandchi, Hossein; Joodaki, Gholamreza (Journal article; Peer reviewed, 2022)Iran is experiencing significant water challenges that have now turned water security into a national priority. By estimating secular trend groundwater storage in Iran between 2002 and 2017, we see that there is an intensive ... -
Etablering av kalibreringsnett, og GNSS baselinjeanalyse
Øie, Marius (Master thesis, 2015)Denne masteroppgaven er todelt, første del handler om etablering av et kalibreringsnett for GNSS, mens den andre delen er en nøyaktighetsanalyse av klassisk statiske GNSS-målinger. I første del av oppgaven har det blitt ... -
Evaluating GNSS-IMU Fusion in Smartphones for Kinematic Positioning Performance
Baglo, Sebastian (Master thesis, 2024)Denne avhandlingen undersøker integrasjonen av Global Navigation Satellite Systems (GNSS) data og Intertial Measurement Unit (IMU) data fra smarttelefoner for kinematisk posisjonering. Grunnet utviklingen og fremskritt ... -
Evaluation of CYGNSS Observations for Flood Detection and Mapping during Sistan and Baluchestan Torrential Rain in 2020
Rajabi, Mahmoud; Nahavandchi, Hossein; Hoseini, Mostafa (Peer reviewed; Journal article, 2020)Flood detection and produced maps play essential roles in policymaking, planning, and implementing flood management options. Remote sensing is commonly accepted as a maximum cost-effective technology to obtain detailed ... -
First Evidence of Mesoscale Ocean Eddies Signature in GNSS Reflectometry Measurements
Hoseini, Mostafa; Asgarimehr, Milad; Zavorotny, valery; Nahavandchi, Hossein; Ruf, chris; Wickert, Jens (Journal article; Peer reviewed, 2020)Feasibility of sensing mesoscale ocean eddies using spaceborne Global Navigation Satellite Systems-Reflectometry (GNSS-R) measurements is demonstrated for the first time. Measurements of Cyclone GNSS (CYGNSS) satellite ... -
Geoid determination over Norway using global Earth gravity Models
Borge, Aina (Master thesis, 2013)Due to increasing accuracy in measurements of the earth's gravity potential from satellitemissions the goeid can be computed with higher resolution and accuracy than earlier. In thethesis the accuracy of geoid heights ... -
Geoid-type surface determination using a gravimetric quasigeoid model and GNSS/leveling data- A case study in eastern Norway
Nahavandchi, Hossein; Skjeset, Lars (Peer reviewed; Journal article, 2013)Norway is about to realize a new vertical datum NN2000, which is supposed to replace the present datum NN1954. Norwegian Mapping Authority (NMA) is also realizing a new geodetic reference frame ITRF09, with focus mainly ...