A simple method to account for topography in the radiometric correction of radar imagery
This article presents a method that allows to study and correct the radiometric distortions caused by topography in SAR images. The method is easy to implement, and requires neither sophisticated software nor code-level programming. It also considers the case of a flat surface having an elevation di...
| Main Authors: | , , |
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| Format: | Informe técnico |
| Language: | Inglés |
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International Center for Tropical Agriculture
2000
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/71311 |
| _version_ | 1855538254172913664 |
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| author | Leclerc, Gregoire Beaulieu, Nathalie Bonn, F |
| author_browse | Beaulieu, Nathalie Bonn, F Leclerc, Gregoire |
| author_facet | Leclerc, Gregoire Beaulieu, Nathalie Bonn, F |
| author_sort | Leclerc, Gregoire |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | This article presents a method that allows to study and correct the radiometric distortions caused by topography in SAR images. The method is easy to implement, and requires neither sophisticated software nor code-level programming. It also considers the case of a flat surface having an elevation different from the one for which calibration parameters were derived. An ortho-image of the slant range distance is used with a digital elevation model to generate images of the local incident angle along the range and azimuth directions. The method compensates for variations in the terrain area of each pixel and for the angular dependence of backscatter, allowing the choice of either an empirical or semi- empirical scattering model. The method is applied to high-resolution C-SAR subsets of an agricultural area in the Central Cordillera of Costa Rica. The removal of topographic features appears excellent for local incident angles up to 80 degrees, but small-scale structures have pronounced effects on the radar return for higher local incident angles and are not adequately corrected. |
| format | Informe técnico |
| id | CGSpace71311 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2000 |
| publishDateRange | 2000 |
| publishDateSort | 2000 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace713112025-11-05T18:16:07Z A simple method to account for topography in the radiometric correction of radar imagery Leclerc, Gregoire Beaulieu, Nathalie Bonn, F topography optimization methods remote sensing topografía métodos de optimización teledetección This article presents a method that allows to study and correct the radiometric distortions caused by topography in SAR images. The method is easy to implement, and requires neither sophisticated software nor code-level programming. It also considers the case of a flat surface having an elevation different from the one for which calibration parameters were derived. An ortho-image of the slant range distance is used with a digital elevation model to generate images of the local incident angle along the range and azimuth directions. The method compensates for variations in the terrain area of each pixel and for the angular dependence of backscatter, allowing the choice of either an empirical or semi- empirical scattering model. The method is applied to high-resolution C-SAR subsets of an agricultural area in the Central Cordillera of Costa Rica. The removal of topographic features appears excellent for local incident angles up to 80 degrees, but small-scale structures have pronounced effects on the radar return for higher local incident angles and are not adequately corrected. 2000 2016-02-29T17:09:59Z 2016-02-29T17:09:59Z Report https://hdl.handle.net/10568/71311 en Open Access application/pdf International Center for Tropical Agriculture Leclerc, Gregoire; Beaulieu, Nathalie; Bonn, F. 2000. A simple method to account for topography in the radiometric correction of radar imagery. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. 28 p. |
| spellingShingle | topography optimization methods remote sensing topografía métodos de optimización teledetección Leclerc, Gregoire Beaulieu, Nathalie Bonn, F A simple method to account for topography in the radiometric correction of radar imagery |
| title | A simple method to account for topography in the radiometric correction of radar imagery |
| title_full | A simple method to account for topography in the radiometric correction of radar imagery |
| title_fullStr | A simple method to account for topography in the radiometric correction of radar imagery |
| title_full_unstemmed | A simple method to account for topography in the radiometric correction of radar imagery |
| title_short | A simple method to account for topography in the radiometric correction of radar imagery |
| title_sort | simple method to account for topography in the radiometric correction of radar imagery |
| topic | topography optimization methods remote sensing topografía métodos de optimización teledetección |
| url | https://hdl.handle.net/10568/71311 |
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