空间数据内插是DEM建模中不可缺少的环节。
Spatial data interpolation is an indispensable process in DEM.
对地理位置参数不易量化的问题，利用GIS空间数据内插算法确定地段等级及地理位置参数。
We use the GIS data interpolation algorithm to calculate the geographic level and geographic indexation to tackle the difficult of quantifying geographic location parameters.
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