空间数据库主要包括数字高程图、土地利用图与土壤类型图。

Using the technique of GIS, the paper analyses the climate, hydrology, soil and land uses in the study area.

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基于地球同步卫星定位原理，分析了当利用数字化地形图提供测站高程时测站的多解和无解现象。

According to the Earth synchronous satellite positioning principle, multi-results and non-results are analyzed when the station height is given using DEM.

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对于采用本方法计算淹没区，准确性受地形图等高距大小、数字化采集精度、数字地面模型（DEM）高程精度以及格网间隔大小、像素探测分辨率等因素的影响。

The accuracy of flood area is mostly dependent on the contour interval of map, accuracy of digitizing map, accuracy of DEM, and interval of GRID, detecting resolution of pixels.

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