| Study on the hierarchical classification method of land cover in the water-wind erosion region — Taking Hengshan as an example |
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| DOI：10.7606/j.issn.1000-7601.2008.04.40 |
| Key Words: hierarchical classification spectral characteristics TM image land cover |
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| Abstract: |
| Taking water-wind erosion region of Hengshan County in Shaanxi Province as a study area certain information was extracted layer by layer through analyzing spectral characteristics of different land cover type by TM image and choosing different characteristic parameter and classification method：first extracting water area by TM5／TM3 and then dividing the other region into vegetation region and non-vegetation region by NDVI．In non-vegetation region town land was extracted through NDBI and NDVI and then sandy land and waste grassland were separated by TM5．While the vegetation region was divided into three classes by NDVI： grassland dryland and shrub forest irrigated land and forest land．Then dryland and shrub forest were separated in class2by TM4 irrigated land and shrub forest in class3by the difference of TM5—TM4．The result of accuracy evaluation showed that the overall classification accuracy is 86．8％ the Kappa coefficient is 0．8506 and they satisfied the classification accuracy standard. |