Journal article
The Loewner Order and Direction of Detected Change in Sentinel-1 and Radarsat-2 Data
Visual Computing, Department of Applied Mathematics and Computer Science, Technical University of Denmark1
Department of Applied Mathematics and Computer Science, Technical University of Denmark2
Microwaves and Remote Sensing, National Space Institute, Technical University of Denmark3
National Space Institute, Technical University of Denmark4
When the covariance matrix formulation is used for multilook polarimetric synthetic aperture radar (SAR) data, the complex Wishart distribution can be used for change detection between acquisitions at two or more time points. Here, we are concerned with the analysis of change between two time points and the “direction” of change: Does the radar response increase, decrease, or does it change its structure/nature between the two time points? This is done by postprocessing/coprocessing the detected change with the Loewner order which calculates the definitenessof the difference of the covariance matrices at the two time points.
We briefly describe the theory. Two case studies illustrate the technique on Sentinel-1 data covering the international Frankfurt Airport, Germany, and on Radarsat-2 data covering Bonn, Germany, and surroundings. We successfully demonstrate our “direction” of change approach to detected change areas.
Language: | English |
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Year: | 2019 |
ISSN: | 15580571 and 1545598x |
Types: | Journal article |
DOI: | 10.1109/LGRS.2019.2918636 |
ORCIDs: | Nielsen, Allan Aasbjerg , Skriver, Henning and Conradsen, Knut |