Abstract
This article describes the analysis of changes in time and look angle series of TanDEM-X (TDX) and TerraSAR-X (TSX) staring spotlight images over the regions around Kjeller near Oslo in Norway and the town Nikel in Russia near the Norwegian border. It is shown that change detection may be done with TDX/TSX with shorter intervals than the repeat cycle using time series of geocoded images with varying look angles. Using look angle series of geocoded images can help to identify changes due to look angle variation. Accurate science orbit data and very good overlap of scenes both in time and look angle make the TDX/TSX data very attractive for both coherent and incoherent change detection.
Highlights
T HE primary objective of the TanDEM-X (TDX) mission was to generate a global digital elevation model (DEM) [1], a high-resolution DEM (HDEM) with 12-m horizontal resolution
In [2], we focused on generation and estimation of the height accuracy of geocoded DEMs with 1.8-m resolution generated from staring spotlight data from the pursuit mono-static mode
The Change DEM will show the changes in the Earth topography from 2010–2014 to 2017–2019 [4]
Summary
T HE primary objective of the TanDEM-X (TDX) mission was to generate a global digital elevation model (DEM) [1], a high-resolution DEM (HDEM) with 12-m horizontal resolution. We will use geocoded TDX staring spotlight data from the science phase (October 2014–March 2015) to analyze the variation of the coherence and amplitudes in time due to changes in the properties of the imaged surface. Much of the work in the literature on SAR coherent change detection has been focused on the analysis of data from stacks of repeated-pass SAR images [5]. We analyze the time series of such coherence images to detect changes We use such high coherent DEMs to geocode amplitude images for the study of incoherent changes in foreign regions where existing digital terrain models (DTM) may be quite coarse. The results in this article which are not dependent on cold climate with ice and snow can be extended to other warmer areas of the globe
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