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Ploton Pierre, Barbier Nicolas, Couteron Pierre, Antin C. M., Ayyappan N., Balachandran N., Barathan N., Bastin J. F., Chuyong G., Dauby Gilles, Droissart Vincent, Gastellu-Etchegorry J. P., Kamdem N. G., Kenfack D., Libalah M., Mofack G., Momo S. T., Pargal S., Petronelli P., Proisy Christophe, Réjou-Méchain Maxime, Sonké B., Texier Nicolas, Thomas D., Verley Philippe, Dongmo D. Z., Berger U., Pélissier Raphaël. (2017). Toward a general tropical forest biomass prediction model from very high resolution optical satellite images. Remote Sensing of Environment, 200, 140-153. ISSN 0034-4257

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Lien direct chez l'éditeur doi:10.1016/j.rse.2017.08.001

Titre
Toward a general tropical forest biomass prediction model from very high resolution optical satellite images
Année de publication2017
Type de documentArticle référencé dans le Web of Science WOS:000412607600011
AuteursPloton Pierre, Barbier Nicolas, Couteron Pierre, Antin C. M., Ayyappan N., Balachandran N., Barathan N., Bastin J. F., Chuyong G., Dauby Gilles, Droissart Vincent, Gastellu-Etchegorry J. P., Kamdem N. G., Kenfack D., Libalah M., Mofack G., Momo S. T., Pargal S., Petronelli P., Proisy Christophe, Réjou-Méchain Maxime, Sonké B., Texier Nicolas, Thomas D., Verley Philippe, Dongmo D. Z., Berger U., Pélissier Raphaël.
SourceRemote Sensing of Environment, 2017, 200, p. 140-153. ISSN 0034-4257
RésuméVery high spatial resolution (VHSR) optical satellite imagery has shown good potential to provide non-saturating proxies of tropical forest aboveground biomass (AGB) from the analysis of canopy texture, for instance through the Fourier Transform Textural Ordination method. Empirical case studies however showed that the relationship between Fourier texture features and forest AGB varies across forest types and regions of the world, limiting model transferability. A better understanding of the biophysical mechanisms on which canopy texture forest AGB relation relies is a prerequisite to move toward broad scale applications. Here we simulated VHSR optical canopy scenes in identical sun-sensor geometry for 279 1-ha tropical forest inventory plots distributed across the tropics. Our aim was to assess the respective merits and complementarity of two types of texture analysis techniques (i.e. Fourier and lacunarity) on a set of forests with contrasted structure and geographical origin, and develop a general texture-based approach for tropical forest AGB mapping. Across forests, Fourier texture captured a gradient of stands mean crown size reflecting well the progressive changes in stand structure throughout forest aggradation phase (e.g. Pearson's r = - 0.42 with basal area) while lacunarity texture captured a gradient of canopy openness (, i.e. Pearson's r = - 0.57 with stand gap fraction). Both types of texture indices were highly complementary for predicting forest AGB at the global level (so-called FL-model). The residual error of the FL-model was structured across sites and could be partially captured with a bioclimatic proxy, further improving the performance of the global model (so-called FLE-model) and reducing site-level biases. The FLE model was tested on a set of real Pleiades images covering a mosaic of high-biomass forests in the Congo basin (mean AGB over 49 field plots: 359 98 Mg ha(-1)), leading to a significant relationship (R-2 = 0.47 on validation data) with reasonable error levels (< 25% rRMSE). The increasing availability of VHSR optical sensors (such as from constellations of small satellite platforms) raises the possibility of routine repeated imaging of the world's tropical forests and suggests that texture-based analyses could become an essential tool in international efforts to monitor carbon emissions from deforestation and forest degradations (REDD +).
Plan de classementEtudes, transformation, conservation du milieu naturel [082] ; Sciences fondamentales / Techniques d'analyse et de recherche [020] ; Télédétection [126]
Descr. géo.AFRIQUE ; INDE ; GUYANE FRANCAISE ; ZONE TROPICALE
LocalisationFonds IRD [F B010071232]
Identifiant IRDfdi:010071232
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010071232

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