Decrease of L-band SAR backscatter with biomass of dense forests
Synthetic aperture radar (SAR) is one of the most promising remote sensors to map forest carbon. The unique spaceborne and long-wavelength SAR data currently available are L-band data, but their relationship with forest biomass is still controversial, particularly for high biomass values. While many studies assume a complete loss of sensitivity above a saturation point, typically around 100 t.ha? 1, others assume a continuous positive correlation between SAR backscatter and biomass. The objective of this paper is to revisit the relationship between L-band SAR backscatter and dense tropical forest biomass for a large range of biomass values using both theoretical and experimental approaches. Both approaches revealed that after reaching a maximum value, SAR backscatter correlates negatively with forest biomass. This phenomenon is interpreted as a signal attenuation from the forest canopy as the canopy becomes denser with increasing biomass. This result has strong implications for L-band vegetation mapping because it can lead to a greater-than-expected under-estimation of biomass. The consequences for L-band biomass mapping are illustrated, and solutions are proposed.
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Subjects: | K01 - Foresterie - Considérations générales, U30 - Méthodes de recherche, F40 - Écologie végétale, télédétection, radar, forêt tropicale humide, biomasse, ressource forestière, cartographie, cycle du carbone, carbone, stockage, http://aims.fao.org/aos/agrovoc/c_6498, http://aims.fao.org/aos/agrovoc/c_24071, http://aims.fao.org/aos/agrovoc/c_7976, http://aims.fao.org/aos/agrovoc/c_926, http://aims.fao.org/aos/agrovoc/c_3050, http://aims.fao.org/aos/agrovoc/c_1344, http://aims.fao.org/aos/agrovoc/c_17299, http://aims.fao.org/aos/agrovoc/c_1301, http://aims.fao.org/aos/agrovoc/c_7427, http://aims.fao.org/aos/agrovoc/c_1432, http://aims.fao.org/aos/agrovoc/c_1229, |
Online Access: | http://agritrop.cirad.fr/575920/ http://agritrop.cirad.fr/575920/1/document_575920.pdf |
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dig-cirad-fr-5759202024-01-28T22:39:42Z http://agritrop.cirad.fr/575920/ http://agritrop.cirad.fr/575920/ Decrease of L-band SAR backscatter with biomass of dense forests. Mermoz Stéphane, Rejou-Mechain Maxime, Villard Ludovic, Le Toan Thuy, Rossi Vivien, Gourlet-Fleury Sylvie. 2015. Remote Sensing of Environment, 159 : 307-317.https://doi.org/10.1016/j.rse.2014.12.019 <https://doi.org/10.1016/j.rse.2014.12.019> Decrease of L-band SAR backscatter with biomass of dense forests Mermoz, Stéphane Rejou-Mechain, Maxime Villard, Ludovic Le Toan, Thuy Rossi, Vivien Gourlet-Fleury, Sylvie eng 2015 Remote Sensing of Environment K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 Afrique centrale Cameroun http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 Synthetic aperture radar (SAR) is one of the most promising remote sensors to map forest carbon. The unique spaceborne and long-wavelength SAR data currently available are L-band data, but their relationship with forest biomass is still controversial, particularly for high biomass values. While many studies assume a complete loss of sensitivity above a saturation point, typically around 100 t.ha? 1, others assume a continuous positive correlation between SAR backscatter and biomass. The objective of this paper is to revisit the relationship between L-band SAR backscatter and dense tropical forest biomass for a large range of biomass values using both theoretical and experimental approaches. Both approaches revealed that after reaching a maximum value, SAR backscatter correlates negatively with forest biomass. This phenomenon is interpreted as a signal attenuation from the forest canopy as the canopy becomes denser with increasing biomass. This result has strong implications for L-band vegetation mapping because it can lead to a greater-than-expected under-estimation of biomass. The consequences for L-band biomass mapping are illustrated, and solutions are proposed. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/575920/1/document_575920.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1016/j.rse.2014.12.019 10.1016/j.rse.2014.12.019 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.rse.2014.12.019 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1016/j.rse.2014.12.019 |
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K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 |
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K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 Mermoz, Stéphane Rejou-Mechain, Maxime Villard, Ludovic Le Toan, Thuy Rossi, Vivien Gourlet-Fleury, Sylvie Decrease of L-band SAR backscatter with biomass of dense forests |
description |
Synthetic aperture radar (SAR) is one of the most promising remote sensors to map forest carbon. The unique spaceborne and long-wavelength SAR data currently available are L-band data, but their relationship with forest biomass is still controversial, particularly for high biomass values. While many studies assume a complete loss of sensitivity above a saturation point, typically around 100 t.ha? 1, others assume a continuous positive correlation between SAR backscatter and biomass. The objective of this paper is to revisit the relationship between L-band SAR backscatter and dense tropical forest biomass for a large range of biomass values using both theoretical and experimental approaches. Both approaches revealed that after reaching a maximum value, SAR backscatter correlates negatively with forest biomass. This phenomenon is interpreted as a signal attenuation from the forest canopy as the canopy becomes denser with increasing biomass. This result has strong implications for L-band vegetation mapping because it can lead to a greater-than-expected under-estimation of biomass. The consequences for L-band biomass mapping are illustrated, and solutions are proposed. |
format |
article |
topic_facet |
K01 - Foresterie - Considérations générales U30 - Méthodes de recherche F40 - Écologie végétale télédétection radar forêt tropicale humide biomasse ressource forestière cartographie cycle du carbone carbone stockage http://aims.fao.org/aos/agrovoc/c_6498 http://aims.fao.org/aos/agrovoc/c_24071 http://aims.fao.org/aos/agrovoc/c_7976 http://aims.fao.org/aos/agrovoc/c_926 http://aims.fao.org/aos/agrovoc/c_3050 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_17299 http://aims.fao.org/aos/agrovoc/c_1301 http://aims.fao.org/aos/agrovoc/c_7427 http://aims.fao.org/aos/agrovoc/c_1432 http://aims.fao.org/aos/agrovoc/c_1229 |
author |
Mermoz, Stéphane Rejou-Mechain, Maxime Villard, Ludovic Le Toan, Thuy Rossi, Vivien Gourlet-Fleury, Sylvie |
author_facet |
Mermoz, Stéphane Rejou-Mechain, Maxime Villard, Ludovic Le Toan, Thuy Rossi, Vivien Gourlet-Fleury, Sylvie |
author_sort |
Mermoz, Stéphane |
title |
Decrease of L-band SAR backscatter with biomass of dense forests |
title_short |
Decrease of L-band SAR backscatter with biomass of dense forests |
title_full |
Decrease of L-band SAR backscatter with biomass of dense forests |
title_fullStr |
Decrease of L-band SAR backscatter with biomass of dense forests |
title_full_unstemmed |
Decrease of L-band SAR backscatter with biomass of dense forests |
title_sort |
decrease of l-band sar backscatter with biomass of dense forests |
url |
http://agritrop.cirad.fr/575920/ http://agritrop.cirad.fr/575920/1/document_575920.pdf |
work_keys_str_mv |
AT mermozstephane decreaseoflbandsarbackscatterwithbiomassofdenseforests AT rejoumechainmaxime decreaseoflbandsarbackscatterwithbiomassofdenseforests AT villardludovic decreaseoflbandsarbackscatterwithbiomassofdenseforests AT letoanthuy decreaseoflbandsarbackscatterwithbiomassofdenseforests AT rossivivien decreaseoflbandsarbackscatterwithbiomassofdenseforests AT gourletfleurysylvie decreaseoflbandsarbackscatterwithbiomassofdenseforests |
_version_ |
1792498818050162688 |