A simple method to account for topography in the radiometric correction of radar imagery
This article presents a method to study and correct 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, but small-scale structures have pronounced effects on the radar return for higher local incident angles and are not adequately corrected.
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Language: | eng |
Subjects: | U30 - Méthodes de recherche, imagerie, topographie, Radar à synthèse d'ouverture, sol agricole, télédétection, http://aims.fao.org/aos/agrovoc/c_36760, http://aims.fao.org/aos/agrovoc/c_7815, http://aims.fao.org/aos/agrovoc/c_37908, http://aims.fao.org/aos/agrovoc/c_33934, http://aims.fao.org/aos/agrovoc/c_6498, http://aims.fao.org/aos/agrovoc/c_1920, |
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dig-cirad-fr-5613122024-01-28T19:33:06Z http://agritrop.cirad.fr/561312/ http://agritrop.cirad.fr/561312/ A simple method to account for topography in the radiometric correction of radar imagery. Leclerc Grégoire, Beaulieu Nathalie, Bonn F.. 2001. International Journal of Remote Sensing, 22 (17) : 3553-3570.https://doi.org/10.1080/01431160010007060 <https://doi.org/10.1080/01431160010007060> A simple method to account for topography in the radiometric correction of radar imagery Leclerc, Grégoire Beaulieu, Nathalie Bonn, F. eng 2001 International Journal of Remote Sensing U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 Costa Rica http://aims.fao.org/aos/agrovoc/c_1920 This article presents a method to study and correct 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, but small-scale structures have pronounced effects on the radar return for higher local incident angles and are not adequately corrected. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/561312/1/document_561312.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1080/01431160010007060 10.1080/01431160010007060 info:eu-repo/semantics/altIdentifier/doi/10.1080/01431160010007060 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1080/01431160010007060 |
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U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_1920 U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_1920 |
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U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_1920 U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_1920 Leclerc, Grégoire Beaulieu, Nathalie Bonn, F. A simple method to account for topography in the radiometric correction of radar imagery |
description |
This article presents a method to study and correct 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, but small-scale structures have pronounced effects on the radar return for higher local incident angles and are not adequately corrected. |
format |
article |
topic_facet |
U30 - Méthodes de recherche imagerie topographie Radar à synthèse d'ouverture sol agricole télédétection http://aims.fao.org/aos/agrovoc/c_36760 http://aims.fao.org/aos/agrovoc/c_7815 http://aims.fao.org/aos/agrovoc/c_37908 http://aims.fao.org/aos/agrovoc/c_33934 http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_1920 |
author |
Leclerc, Grégoire Beaulieu, Nathalie Bonn, F. |
author_facet |
Leclerc, Grégoire Beaulieu, Nathalie Bonn, F. |
author_sort |
Leclerc, Grégoire |
title |
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_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_sort |
simple method to account for topography in the radiometric correction of radar imagery |
url |
http://agritrop.cirad.fr/561312/ http://agritrop.cirad.fr/561312/1/document_561312.pdf |
work_keys_str_mv |
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_version_ |
1792497919226544128 |