Abstract
Karst rocky desertification is one of the most serious geo-ecological disaster in Southwestern China.The extraction of rocky desertification regions and grade division of rocky desertification are the most important premises to do rocky desertification research.The percentage of bare rock is an important index to do rocky desertification grade division.Using scientific and fast methods to calculate the percentage of bare rock is the basis for the extraction of rocky desertification regions and grade division of rocky desertification.We proposed a multi-spectrum remote sensing image-based method to calculate the percentage of bare rock and the TM image at 1987 of Houzhai stream in Puding County,Guizhou Province was chose as experiment data.Firstly,the image was processed to attain the image object.Then,extract the Normalized Difference Vegetation Index(NDVI) and Bare Soil Index(BI) from the image by band calculation.NDVI and BI were used to calculate vegetation coverage and soil bareness percentage,respectively.Finally,the percentage of bare rock could be calculated by making use of layers arithmetic operation.The experiment result shows that the method proposed in this paper has feasibility.
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