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Lookup NU author(s): Professor Zhenhong Li
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Repeat-pass synthetic aperture radar interferometry (InSAR) appears to be an excellent tool for generating digital elevation models (DEMs) of high spatial and vertical resolution. However, in recent years, it has been noticed that the atmosphere causes errors in the elevation accuracy. The objective of this paper is to try to identify climatic regions in India where InSAR can be used for generating DEMs. A detailed study was carried out to quantify atmospheric effects on the DEMs derived from repeat-pass InSAR. Three test sites were selected for the analysis: one over Mumbai, which is a part of the western ghats region with hilly terrain, lakes and forests; another is the Kolar area with gently undulating terrain with agricultural and forested lands; and the last was Bhuj, an arid plains region which is close to the Rajasthan Thar desert, India. Six interferograms of the Bhuj area derived from two tandem pairs were analysed and it was found that there were varying atmospheric effects of the order of 0.2λ to 1λ and at specific locations more than λ. In the case of the Mumbai and Kolar study areas with two interferograms each, the atmospheric effects were almost negligible. In these cases, it is shown that it was also possible to estimate the height of buildings to an accuracy of 1-2 m. Therefore, it is concluded that one should be cautious when using InSAR techniques for generating DEMs of desert/arid regions where the climate may be very dynamic and only small amounts of water vapour can cause strong atmospheric artefacts.
Author(s): Rao K, Al-Jassar H, Phalke S, Rao Y, Muller J-P, Li Z
Publication type: Article
Publication status: Published
Journal: International Journal of Remote Sensing
Year: 2006
Volume: 27
Issue: 3
Pages: 595-616
Print publication date: 01/02/2006
Online publication date: 22/02/2007
ISSN (print): 0143-1161
ISSN (electronic): 1366-5901
Publisher: Taylor & Francis
URL: http://dx.doi.org/10.1080/01431160500239248
DOI: 10.1080/01431160500239248
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