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Elevation Change and Improved Velocity Retrieval Using Orthorectified Optical Satellite Data from Different Orbits

Remote Sensing, 2017, Vol.9(3), p.300 [Peer Reviewed Journal]

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  • Title:
    Elevation Change and Improved Velocity Retrieval Using Orthorectified Optical Satellite Data from Different Orbits
  • Author: Altena, Bas ; Kääb, Andreas
  • Found In: Remote Sensing, 2017, Vol.9(3), p.300 [Peer Reviewed Journal]
  • Subjects: Digital Elevation Models ; Satellite Imagery ; Glaciers ; Glaciers ; Ice ; Ice ; Landsat ; Convolution ; Glaciers ; Velocity ; Orbits ; Landsat ; Satellites ; Spatial Discrimination ; Elevation ; Remote Sensing ; Velocity
  • Language: English
  • Description: Optical satellite products are available at different processing levels. Of these products, terrain corrected (i.e., orthorectified) products are the ones mostly used for glacier displacement estimation. For terrain correction, a digital elevation model (DEM) is used that typically stems from various data sources with variable qualities, from dispersed time instances, or with different spatial resolutions. Consequently, terrain representation used for orthorectifying satellite images is often in disagreement with reality at image acquisition. Normally, the lateral orthoprojection offsets resulting from vertical DEM errors are taken into account in the geolocation error budget of the corrected images, or may even be neglected. The largest offsets of this type are often found over glaciers, as these may show strong elevation changes over time and thus large elevation errors in the reference DEM with respect to image acquisition. The detection and correction of such orthorectification offsets...
  • Identifier: E-ISSN: 20724292 ; DOI: 10.3390/rs9030300

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