postgis空间关系
2020-08-04 本文已影响0人
清远_03d9
1.空间关系如下:
![](https://img.haomeiwen.com/i7083086/b2fd378d082bebab.png)
2.取不相交部分
geometry ST_SymDifference(geometry geomA, geometry geomB);
3. 从A取与B不相交部分
geometry ST_Difference(geometry geomA, geometry geomB);
4.超出边界部分计算
![](https://img.haomeiwen.com/i7083086/24363a72528c03e2.png)
5.面缝隙部分如何实现
![](https://img.haomeiwen.com/i7083086/5487c8c3b4bc7227.png)
3. 拓扑检查后出现很多小面
![](https://img.haomeiwen.com/i7083086/7b6f6bd2c2841434.png)
geometry ST_SymDifference(geometry geomA, geometry geomB);
geometry ST_Difference(geometry geomA, geometry geomB);