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TitleAspects of digital elevation data requirements for operational geocoding of RADARSAT imagery
AuthorChen, J M
SourceCanadian Journal of Remote Sensing 19, 2, 1993 p. 131-139,
Alt SeriesEarth Sciences Sector, Contribution Series 20041504
PublisherInforma UK Limited
Mediapaper; on-line; digital
File formatpdf
Released2014 08 01
The geocoding of RADARSAT synthetic aperture radar (SAR) imagery will present a significant challenge, in part because of the sensor's multi-mode operation but also because of the need to incorporate elevation correction in order to generate true orthoview products. Operational correction facilities will require large area "seamless" digital elevation model (DEM) coverage, a data source that is currently unavailable for most areas of the world. From the concept of topographic scaling factor and through the analysis of ETOPO-5 and selected North American DTED elevation data, methods are developed to quantify the effects of inherent DEM accuracy and DEM sampling density on geocoded SAR image quality. In addition, a method is proposed by which local ETOPO-5 elevation variability can be used to predict DEM sampling density requirements on a global scale.

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