REMOTE SENEING APPLICATION IN COUNTY-LEVEL LAND CLASSIFICATION AND LAND EVALUATION IN ARID AND SEMI-ARID ZONES——SHENMU COUNTY,SHAANXI PROVINCE AS A CASE STUDY

摘要

1. Backgrounds Land classification and evaluation are necessary foundments for county-level deci-sions of land use planning and economic development. On the bases of physical conditions,the targets of land classification and land evaluation adhere to particular principles andmethodologies are to find out the quality, quantity and spatial distribution regularities of re-gional structure of land, and to obtain relevant information of land suitabilities and