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TitleDynamics of RADARSAT Backscattering Values Related to Primary and Secondary Forest Biomass Structure in SW Amazonia, Brazil
Authordos Santos, J R; Kux, H J H; Lacruz, M S; Ahern, F; Pietsch, R
SourceISPRS Commission VII Symposium, Budapest, Hungary, September 1-4; 1998 p. 527-531
Alt SeriesEarth Sciences Sector, Contribution Series 20042632
AbstractThe principal objective of this study is to evaluate the relations among the Radarsat backscatter and biophysical parameters, (biomass), of primary and secondary forest. Another objective is to analyze the usefulness of this SAR sensor system to discriminate among the land cover classes of the region surrounding Rio Branco (Acre State, Brazil). Two RADARSAT scenes at begin of dry and wet seasons were used. This dataset underwent the following pre-processing: reduction of speckle, scaling of data from 16 to 8 bits real integer, and extraction the backscattering values (linear g0 unities). Afterwards these scenes were registered to a TM-Landsat image to improve the identification of the classes: primary forest with and without bamboo; initial, intermediate and advanced natural regrowth; pasture at distinct phenological conditions and burned areas. Ground control campaigns were performed to acquire dendrometric data (DBH and height of the arboreal individuals) in several plots of the primary and secondary forest. The biomass was estimated by the most adequate allometric equations for each vegetation type. Furthermore, diagrams of the biomass from primary and secondary forest are presented and discussed together with the seasonal backscatter signals. The multitemporal analysis of Radarsat data shows the behavior of the dynamics of other land cover from this area.

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