Browsing by Author "Weydahl, Dan Johan"
Now showing items 1-9 of 9
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Comparison of RADARSAT and IKONOS satellite images - detection and visibility of man-made objects
Bretar, Frédéric; Weydahl, Dan Johan (2001)This report compares the visual appearance and detection of different man-made objects in an area close to Bergen city in Norway using IKONOS (1 m resolution) and RADARSAT (9 m resolution) images respectively. The results ... -
Detection of forest clear-cuts with shuttle radar topography mission (SRTM) and tandem-X InSAR data
Solberg, Svein; Astrup, Rasmus Andreas; Weydahl, Dan Johan (2013)The aim of this study was to determine whether forest clear-cuts during 2000–2011 could be detected as a decrease in surface height by combining Digital Surface Models (DSMs) from the Shuttle Radar Topography Mission ... -
ERS tandem InSAR processing for DEM generation, glacier motion estimation and coherence analysis on Svalbard
Eldhuset, Knut; Andersen, Per Helge; Hauge, Svein; Isaksson, Elisabeth; Weydahl, Dan Johan (2003)This paper describes the unique InSAR (Interferometric Synthetic Aperture Radar) processing algorithms at Norwegian Defence Research Establishment (FFI) and how ERS (European Remote Sensing Satellite) tandem data are used ... -
Forslag til funksjonsapparat for fremtidig bruk av radarsatellitter i base- og havneovervåkning
Weydahl, Dan Johan (2001)Synthetic aperture radar (SAR) images can be used to detect changes at the Earth surface over time. This makes it possible to follow construction work development and activities in bases and harbours. This report describes ... -
Geolocation and Stereo Height estimation Using TerraSAR-X Spotlight Image Data
Eldhuset, Knut; Weydahl, Dan Johan (2011)We have studied the geographic position of several high-resolution spotlight TSX images by investigating the location of deployed radar corner reflectors. Results show that the geolocation accuracy is better than the ... -
Høyoppløsnings SAR satellittbilder tatt over fjellpartier ved Bjerkvik i Nord-Norge
Weydahl, Dan Johan; Eldhuset, Knut (2011-07-04)Vi har brukt høyoppløsnings Radarsat-2 og COSMO-SkyMed syntetisk aperture radar satellittbilder (SAR) tatt i april 2010 for å evaluere fremkommelighet og noen utvalgte særtrekk ved fjellterrenget øst for Bjerkvik i ... -
Temporal stability of X-band single-pass InSAR heights in a spruce forest: Effects of acquisition properties and season
Solberg, Svein; Weydahl, Dan Johan; Astrup, Rasmus Andreas (2015)We investigated the stability of TanDEM-X interferometric synthetic aperture radar (InSAR) heights across eight repeated acquisitions. With InSAR height we mean the height above ground of the scattering phase center. We ... -
Using stereo SAR and InSAR by combining the COSMO-SkyMed and the TanDEM-X mission satellites for estimation of absolute height
Eldhuset, Knut; Weydahl, Dan Johan (2013)The objective of this work is to estimate absolute height in synthetic aperture radar (SAR) interferograms. Since height in interferograms is relative, we use stereo SAR with several satellites to achieve absolute height ... -
Validation of SRTM elevation data in Norway
Weydahl, Dan Johan (2005)The Shuttle Radar Topography Mission (SRTM) was carried out in February 2000. The goal was to produce a global and consistent digital elevation model with a grid posting of 30 m or 90 m, and with an absolute vertical ...