Dan Johan Weydahl

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Norsk Regnesentral Norsk Regnesentral (Norwegian Computing Center, NR) is a private, independent, non‐profit foundation established in 1952. NR carries out contract research and development projects in the areas of information and communication technology and applied statistical modelling. The clients are a broad range of industrial, commercial and public(More)
Interferometric satellite synthetic aperture radar (SAR) data was acquired from an area on Spitsbergen, Svalbard, during the European remote sensing satellite (ERS) Tandem mission in 1995–1996. Analyzing these data sets shows that the estimated SAR coherence is highly dependent on the satellite baseline length, and that corrections for this decorrelation(More)
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 (SRTM) and Tandem-X, and to evaluate the performance of this method using SRTM Xand C-band data as references representing the heights before(More)
In this paper, we present the results achieved in the long-term subsidence project in Norway, ESA AO-1104, which have made use of ERS SAR data. By applying the differential SAR interferometry technique referred to as Small Baseline Subset (SBAS) approach to a test area covering the city of Oslo, Norway, we show significant subsidence in several areas of(More)
The interferometric SAR (InSAR) technique may be a valuable tool for subsidence monitoring at different places of the Earth surface. Many results have been reported during the 1990’s where data from the ERS-1 and ERS-2 SAR sensors were used. This paper will present the ongoing long-term subsidence project in Norway, AO-1104, that are making use of ERS SAR(More)