| Title | Impact of DEM source on Radarsat-2 polarimetric information during ortho-rectification |
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| Author | Toutin, T; Wang, H |
| Source | International Journal of Image and Data Fusion vol. 5, no. 2, 2014 p. 109-122, https://doi.org/10.1080/19479832.2013.831953 |
| Year | 2014 |
| Alt Series | Earth Sciences Sector, Contribution Series 20120357 |
| Publisher | Informa UK Limited |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Subjects | geophysics; remote sensing; satellite imagery; Radarsat-2; ground-space method; image-space method |
| Program | Topographic Mapping |
| Released | 2014 02 14 |
| Abstract | Ortho-rectification using digital terrain models is a key issue for full polarimetric complex synthetic aperture radar (SAR) data because resampling the complex data can corrupt the polarimetric phase,
mainly in terrain with relief. Two methods for ortho-rectification of the complex SAR data can be applied: the polarimetric processing is performed before (image-space method) or after (ground-space method) the geometric processing. This research
evaluated the impact of the digital elevation models (DEMs), which are generally available to users (topographic DEM and ASTER GDEM V2). The two methods were applied to three Radarsat-2 fine-quad data acquired with different look angles over a hilly
relief study site. Quantitative evaluations between the two approaches as a function of different geometric and radiometric parameters were, thus, performed to evaluate the impact during the ortho-rectification. The results demonstrated that the look
angles and the terrain slopes can potentially corrupt the single-look polarimetric complex SAR data during its ortho-rectification with the ground-space method, mainly at the layover limit. However, advice is provided to reduce these impacts to an
acceptable level. |
| GEOSCAN ID | 292156 |
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