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Study on Compilation of the Farmland Grade Map Based GIS

TIAN Hong- jun et al(College of Mathematics,Physics & Software Engineering,Lanzhou Jiaotong University,Lanzhou,Gansu 730070)  
Cartography generalization is the kernel of larger scale map miniature smaller scale map,but current research is mostly concentrated on the generalization of the geometric feature,particularly in the aspects of automated map generalization about point figures and line figures,seldom involved polygon figures.By designing processes for the compilation of the map on 1:2 500 000 provincial farmland grade,the main point was emphasized on the generalization of cartography object,for example,patch elimination,unite,simplification of patchs outline,using the software of MapGIS to put in practice by adopting the man-machine alternant way.
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