空间叠加是GIS系统必不可少的空间分析功能之一，空间叠加分析效率的高低直接影响到GIS整体功能的发挥。
Spatial overlay is one of the most important spatial analysis functions in the Geographic Information System, and its efficiency will directly influence the whole function of GIS.
再将敖汉旗土地利用空间及属性数据与土地适宜性评价的结果进行叠加分析，得出退耕地数量与空间分布，以及还林还草地数量与空间分布。
Then we overlay land-use map and the results of land suitability evaluation of Aohanqi Banner to get the amount and spatial distribution of farmland which should be returned to forest and grassland.
系统实现了一系列通用的操作，提供了影响范围分析、叠加分析等空间分析手段；
The system has realized a series of performing for general use and provided some methods to influence the spatial analysis and superimposition analysis.
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