Accuracy and applicability of linear spectral unmixing in delineating potential erosion areas in tropical watersheds
作者： A. M. de Asis , K. Omasa , K. Oki , Y. Shimizu
DOI: 10.1080/01431160701874579
关键词:
摘要: This study was undertaken to assess the accuracy of linear spectral unmixing (LSU) in estimating fractional abundance land cover components and examine its applicability delineating potential erosion areas tropical watershed. Five image end-members (mixed vegetation, grass, Acacia auriculiformis, bare soil water/shadow) were selected used different combinations Landsat Enhanced Thematic Mapper (ETM) into fraction images. The assessment conducted by comparing estimates derived from with measured field-validated classified QuickBird imagery. Good agreement obtained using a four-end-member combination which shadow eliminated. results suggest that LSU could be implemented for detection. In general, increases when vegetation decreases; hence, we images derive soil/vegetation ratio as simple indicator map high areas. Comparison field actual levels area showed technique is effective identifying on control efforts should concentrated.
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