base centred 中文意思是什麼
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According to procedures and rules for arable land gradation and classification, the thesis make studies with taiyuan city jiancaoping country as study region. this region is a town ' s outskirts which have complicated terrain, differ greatly in land quality and contaminated arable land. the study has centred on the structural system of the index of the arable land gradation and classification, the definition and quantify of the ecological index, the divide of index ' s region and the foundation of data base which is based on mapgis for the arable land gradation and classification
該項研究就是在此背景下，以太原市尖草坪區為研究區域，以《農用地分等定級規程》為技術依據，針對該區域地形復雜、城郊型特點明顯，土地質量差異較大，土地污染現象嚴重等特點，重點對農用地分等定級指標體系的構建、生態環境指標的確定和量化、指標區的劃分，以及基於mapgis支持下的分等定級數據庫的建立和應用等開展了研究。
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