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Evaluation of Time Series Tandem-x Digital Elevation Models : Volume Xl-8, Issue 1 (28/11/2014)

By Jain, M.

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Book Id: WPLBN0004016238
Format Type: PDF Article :
File Size: Pages 5
Reproduction Date: 2015

Title: Evaluation of Time Series Tandem-x Digital Elevation Models : Volume Xl-8, Issue 1 (28/11/2014)  
Author: Jain, M.
Volume: Vol. XL-8, Issue 1
Language: English
Subject: Science, Isprs, International
Collections: Periodicals: Journal and Magazine Collection, Copernicus Publications
Historic
Publication Date:
2014
Publisher: Copernicus Publications, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Deo, R., Kumar, V., Rao, Y. S., & Jain, M. (2014). Evaluation of Time Series Tandem-x Digital Elevation Models : Volume Xl-8, Issue 1 (28/11/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Centre of Studies in Resources Engineering, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India. 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.

Summary
Evaluation of Time Series TanDEM-X Digital Elevation Models

 

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