PostGIS简介 PostGIS是对象关系型数据库系统PostgreSQL的一个扩展，PostGIS提供如下空间信息服务功能：空间对象、空间索引、空间操作函数和空间操作符。-Introduction to PostGIS PostGIS is a PostgreSQL object-relational database systems an extension, PostGIS spatial information service offers the following features: spatial objects, spatial indexing, spatial operations functions and spatial operators.