The GIS space data accuracy and quality can directly affect a national GIS application more intensively and extensively.
GIS空间数据精度与质量直接影响一个国家GIS应用的广度与深度。
High accuracy DEMs is an important data in study of soil erosion and terrain feature space analysis.
高精度数字高程模型(DEM)是水土流失规律研究与流域地形空间分析中重要的空间数据。
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