GIS缓冲分析，包括地物缓冲区，多边形缓冲区，矩形缓冲区，多义线缓冲和点缓冲-GIS buffer analyse,it contains polygon buffer、polyline buffer and point buffer

GIS的Arcengine编程，实现了属性查询，空间查询，字段统计，Buffer生成，和最邻近点查询等功能-GIS-Arcengine programming, to achieve the attribute query, spatial query, field statistics, Buffer generation, and the nearest point of query functions