Detecting forest area and crops using vegetation indices
1993
Mohd Ibrahim Seeni Mohd | Azhar Hj Salleh (Teknologi Malaysia Univ. (Malaysia). Centre for Remote Sensing)
Vegetation Indices (VI) represent a linear transformation of spectral bands that express the spectral behaviour of crops and natural vegetation. VI emphasizes spectral contrast between different surfaces, and therefore have been widely used for enhancing vegetation and classifying agricultural areas. This paper reports on studies carried out in the Bukit Kajang Forest Reserve and surrounding crop areas at Raub, Malaysia with the Landsat-5 Thematic Mapper satellite data using various vegetation indices to evaluate their potential in differentiating forest area and major crops. The Perpendicular Vegetation Index (PVI), Normalized Difference Vegetation Index (NDV), and Ratio Vegetation Index (RVI) have been evaluated on the basis of their spectral band combinations and rationing for differentiating rubber, oil palm and forest areas. The combination of Mid-Infrared (MIR) band 5 and Visible (VIS) band 2 in the PVI gave the most difference among crops whereas the NDVI and RVI resulted in similar values. Significant differences were found between the forest areas and the other crops thus enhancing the forest areas
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