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Multi-Pass Interferometric SAR DEMs for Hydrological Network Derivation

Walker, AH; Muller, JP; Morley, JG; Smith, A; Naden, PS; (2000) Multi-Pass Interferometric SAR DEMs for Hydrological Network Derivation. In: (pp. pp. 369-376).

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An experiment was carried out over the Thames basin in the UK to derive a 1″ (20m) Digital Elevation Model (DEM) from both ascending and descending ERS tandem IfSAR pairs using a commercially available processing system from Phoenix Systems. A quality assessment is shown of the individual and combined IfSAR-DEMs when compared against DTED-1 at 3″ (≈100m resolution, courtesy of MCE Feltham, UK) and the Institute of Hydrology's hydrological DIM (IHDTM), a 50m DTM derived from contours and water features from Ordnance Survey 1:50, 000 maps [1,2]. Simple methods for combining multi-pass IfSAR OEMs and filtering single pass tandem pair IfSAR DEMs to remove speckle noise and atmospheric artefacts were explored. A Hydrological network extraction algorithm was applied to the IfSAR-DEMs and the subsequent networks were compared against those available from cartographic sources. An assessment is made of the potential value of such IfSAR-DEMs for global high resolution hydrological network extraction, particularly in the light of the forthcoming NASA SRTM mission.

Type: Proceedings paper
Title: Multi-Pass Interferometric SAR DEMs for Hydrological Network Derivation
URI: http://discovery.ucl.ac.uk/id/eprint/96769
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