The key technology of GIS when applying in the field of mining subsidence is analyzed, too.
分析了GIS在开采沉陷领域应用的关键技术问题。
Based on GIS technology, agricultural land gradation was studied applying factor method and modifying method in the centre of Leshan City, Sichuan Province.
以GIS为平台，采用修正法和因素法相结合，对乐山市中区农用地定级进行了研究。
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