Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-8, 437-441, 2014
https://doi.org/10.5194/isprsarchives-XL-8-437-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
28 Nov 2014
Evaluation of Time Series TanDEM-X Digital Elevation Models
M. Jain, R. Deo, V. Kumar, and Y. S. Rao Centre of Studies in Resources Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
Keywords: Synthetic Aperture Radar Interferometry, Digital Elevation Model, Fusion, TanDEM X, Time series data, Evaluation Abstract. Digital Elevation Model (DEM) is an important input for geo-spatial analysis. For various applications like flood management, ortho rectification of remote sensing images, navigation, architectural works, defence, etc., high resolution DEM is required. TanDEM-X mission was launched in 2010 to obtain high resolution global DEM with HTRI-3 standard. SAR interferometry (InSAR) technique is used for DEM generation from TanDEM-X SAR data. The accuracy of DEM depends on many parameters like height ambiguity, incidence angle, polarization, etc. In this study, time series TanDEM-X data spanning over 3 years, had processed for generating DEM at the spatial resolution of 6 m and their accuracy had studied using DGPS elevation data and SRTM 90 m DEM. The products generated during DEM generation process are DEM, precision (or height error), coherence, layover and shadow images. Using weighted average fusion technique, ascending and descending DEMs are fused for improving the quality of DEM and to reduce invalid pixels corresponding to layover and shadow areas. Results from time series data were analysed and found RMSE error of fused DEMs is in the range of 2 m to 4 m, while individual DEM has accuracy of 3 m to 6 m with respect to DGPS elevation data. Fused DEMs are having high accuracy as well as less voids. The reduction of voids by fusion, ranges from 40 to 85 % in different combinations of data.
Conference paper (PDF, 2350 KB)


Citation: Jain, M., Deo, R., Kumar, V., and Rao, Y. S.: Evaluation of Time Series TanDEM-X Digital Elevation Models, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-8, 437-441, https://doi.org/10.5194/isprsarchives-XL-8-437-2014, 2014.

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