Abstract
Abstract. Large scale mapping and modeling of urban areas is requested in many fields, especially in planning of energy supply and for change detection. For this purpose, SAR systems are highly attractive due to their independency of daytime and weather. The new satellite configuration of TerraSAR-X and TanDEM-X provides single-pass 3D mapping of the earth with unprecedented geometric resolution, allowing for improved detection and extraction of building positions and shapes. In this paper, single-pass interferograms of the TanDEM-X mission are utilized to automatically reconstruct buildings. To this purpose, first an interferogram is calculated from a TanDEM pair. Then, a new detector is applied that analyses phase ramps in the interferogram. Phase ramps being a pattern typically observable in layover areas of buildings, the detector is able to indicate building locations. Afterwards, the detected building areas are analyzed in more detail to extract width, length, and height of the buildings. Last, an edge detector is applied to deduce the building shapes. The reconstruction results are compared with reference data.
Highlights
Since 2011, the new satellite configuration of TerraSAR-X and TanDEM-X delivers high resolution single-pass InSAR data (Krieger et al 2009)
One major challenge is the monitoring of urban areas especially in case of disasters, where SAR systems are capable of providing information independent of daytime and weather
The TanDEM configuration establishes the new opportunity of exploiting interferometric phase acquired during a single pass of the two satellites, which minimizes the effect of decorrelation on building extraction
Summary
Since 2011, the new satellite configuration of TerraSAR-X and TanDEM-X delivers high resolution single-pass InSAR data (Krieger et al 2009). These new data prepare the ground for new applications; in particular, methods to automatically derive cartographic information are desirable. Analysis of InSAR time series which provides results of high precision, but takes a long time to acquire the data. The second group investigates the interferometric phase signature of buildings, and point scatterers at façades, which allows for the detection of slight motions The TanDEM configuration establishes the new opportunity of exploiting interferometric phase acquired during a single pass of the two satellites, which minimizes the effect of decorrelation on building extraction.
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