Bulletin des sciences géographiques de l'INCT
Volume 12, Numéro 2, Pages 38-44
2008-10-31
Investigation Of Elevation Bias Of The Srtm C- And X-band Digital Elevation Models
Authors : Becek K .
Abstract
The paper presents results of a comparative study of the vegetation-caused elevation bias of the space shullle topographie mission data product , both C- and X-band (SRTM.C/X). The SRTM.C/X bands data were compared against a high-resolution digital terrain model. Pixel-based differences in SRTM.X minus SRTM.C were correlated with land cover ('agriculture' ,'house' ,'tree' ,'water'). Find ings of the investigations include thal the SRTM.X does not represent a canopy top of vegetation and that the X-band penetrates deeper vegetation cover than the C-band. As a test site, an area of about 159 km2 on the Gold Coast, Queensland, Australia, was selected. The area of interest is about 57% covered by vegetation varying from grassland and shrubs to forest. The study method allowed the development of a statistical model relating the elevation bias to the percentage of the vegetation cover of a given land parce!. This mode!, once verified on varieties of vegetation types, could be utilised to estimate and eliminate the elevation bias from the InSAR elevation mode!. This mode! could also be utilised for estimating biomass quantities and their variations. Il is hoped thal the results will also stimulate investigations towards de veloping a multi frequency InSAR system for collecting both terrain elevation data and allributes of biomass.
Keywords
Remote Sensing, Vegetation, Retrieval, Multifrequency, DEM/DTM, SAR, Land Cover.
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