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- W2109190695 abstract "The main purpose of the study was to investigate if convex geometry and partial unmixing could be used to map succession stages on grasslands with respect to encroachment. The study was performed on a Compact Airborne Spectrographic Imager (casi) image acquired in 2 m resolution spatial mode with 11 bands in the spectral range from 396.2-902.6 nm. Spectral mode image data was used to assess the radiometric and spectral calibration and consequently the spatial data was spatially and spectrally subset to include 9 bands. The data were calibrated to surface reflectance and transformed to minimum noise fraction (MNF) feature space and the spectral dimensionality of the data was evaluated. Pixel purity indexing (PPI) technique was used to extract the purest pixels in the image from convex geometry concepts and rotating three-dimensional scatterplots were used to find endmember related to woody species. Two endmembers were identified: deciduous trees and conifers. Conifers were highly correlated with shade. Matched filtering or Constrained Energy Minimization (CEM) was used to map the selected endmembers. Forests with deciduous trees and conifers had high abundance. Groups of trees on derelict grassland areas where the density and age of trees were similar to the forests also had high abundance. Individual woody species out in the open grassland area had high abundance in a few places. Grassland areas with a spectral signature similar to conifers came out with low abundance and agricultural fields came out as false positives. It is generally concluded that the image gives the option of mapping succession at a late encroachment stage whereas individual scrubs at early encroachment stages tend to be overlooked." @default.
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- W2109190695 date "1998-01-01" @default.
- W2109190695 modified "2023-09-27" @default.
- W2109190695 title "MONITORING GRASSLANDS USING CONVEX GEOMETRY AND PARTIAL UNMIXING - A CASE STUDY" @default.
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