摘要
Using agricultural geology survey data, this paper discusses how to use the MapGIS spatial analysis module for the land quality geochemistry assessment. Taking land consolidation areas of Tuojiang Village as an example, the authors select soil nutrient index, soil environmental index, water and atmospheric environment index, large crop safety index for major evaluation indicators. Using digital terrain model of MapGIS, the authors draws maps in single factor and single index classification. The authors use spatial analysis module of area-to-area to analysis in multi-index and multi-factors. Finally the map of geochemical gradation and classification of land quality was drawn.