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TitleScientist's idealism versus user's realism on Radarsat-2 HR stereo capability without GCP: two cases over north and arctic sites in Canada
AuthorToutin, T; Omari, K; Blondel, E; Clavet, D; Schmitt, C V
SourcePhotogrammetrie - Fernerkundung - Geoinformation vol. 2012, no. 4, 2012 p. 385-394,
Alt SeriesEarth Sciences Sector, Contribution Series 20120356
Mediapaper; on-line; digital
File formatpdf
AreaBaffin Bay; Gibbs Fiord
Lat/Long WENS-72.0000 -71.0000 71.0000 70.7500
Subjectsgeophysics; remote sensing; radar imagery; radar methods; Radarsat-2; SAR
Illustrationssatellite images; plots
ProgramTopographic Mapping
Released2012 08 01
AbstractDigital surface models (DSMs) are extracted from high-resolution Radarsat-2 (R2) stereo images using our new hybrid radargrammetric modeling without ground control point developed at the Canada Centre for Remote Sensing. They are then evaluated over two Canadian northern and Arctic study sites: the rst for the scientific validation and the second in the Arctic (steep relief and glaciated surfaces) for the operational evaluation. For the validation site, the bias and elevation linear errors with 68 percent con dence level (LE68) of R2 stereo-extracted DSM compared to lidar data were computed over bare surfaces: LE68 of 3.7 m and no bias were achieved. For the Arctic study site, a large negative bias of 18-20 m and LE68 of 21-30 m were computed versus ICESat data over and outside ice elds, respectively. In addition LE68 of 15 m with equivalent bias was obtained over ice elds with 0°-5° slopes, which generally occurred in ice elds. The large biases certainly suggest a bias in the R2 stereo-model and thus in the metadata used in our hybrid model computation.

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