一个最基本的GIS，需要包含如下的组成部分：管理空间坐标数据的矢量图形系统，管理属性数据的数据库管理系统，以及实现矢量图形系统与数据库管理系统双向连接的连接系统以及空间分析功能等。 矢量图形系统.. -a basic GIS, the need to contain the following components : Coordinate data management space vector graphics system, the attribute data management da

用vc++实现PCA影像融合。结果图像兼备高空间分辨率和高光谱信息。-PCA with vc++ achieve image fusion. The resulting image both high spatial resolution and high spectral information.

Since objects stored in a spatial can be rather complex they are often approximated by simpler objects, and spatial indexes are then built on these approximations. The most commonly used approximation is the minimal bounding box: the smallest