Fusion of ascending and descending pass raw TanDEM-X DEM

Author

Deo, Rinki ; Rossi, Cristian ; Eineder, Michael ; Fritz, Thomas ; Rao, Y.S. ; Lachaise, Marie

Author_Institution

CSRE, Indian Inst. of Technol. Bombay, Mumbai, India

fYear

2014

fDate

13-18 July 2014

Firstpage

21

Lastpage

24

Abstract

This paper deals with the fusion of TanDEM-X raw DEMs in ascending and descending pass over Mumbai test area and enhance its quality. Before applying fusion method, a robust layover and shadow map has been calculated in ITP using TanDEM-X DEM and the corresponding slant range image. The selection of optimum weights for fusion has been based on height error map calculated from interferometric coherence. Results show a substantial reduction in number of invalid pixels after fusion. In the fused DEM, invalid is only 1.2%, while ascending and descending pass DEMs have 6.7% and 5.7% respectively. The improvement in accuracy of the DEM is very slight in this case which is due to the coarse resolution of the SRTM DEM used as reference.

Keywords

digital elevation models; radar imaging; radar interferometry; sensor fusion; synthetic aperture radar; terrain mapping; ITP; Mumbai test area; SRTM DEM; ascending pass TanDEM-X raw DEM; coarse resolution; descending pass TanDEM-X raw DEM; fused DEM; fusion method; height error map; interferometric coherence; invalid pixels; robust layover; shadow map; slant range image; Accuracy; Coherence; Filtering; Remote sensing; Robustness; Standards; Synthetic aperture radar; Fusion; Layover; Shadow; TanDEM-X; optimum weightage;

fLanguage

English

Publisher

ieee

Conference_Titel

Geoscience and Remote Sensing Symposium (IGARSS), 2014 IEEE International

Conference_Location

Quebec City, QC

Type

conf

DOI

10.1109/IGARSS.2014.6946345

Filename

6946345