ST_AsGrid - 云原生数据库 PolarDB

计算几何对象相交的所有网格对象。

语法

geomgrid[] ST_AsGrid(geometry geom, integer precision, bool degenerated default false);

参数

参数名称	描述
geom	需要计算的几何对象。
precision	精度级别，取值：1~32，数值越大代表计算越精细。
degenerated	是否采用退化网格。退化网格与普通网格的对比如下：

描述

几何对象的空间参考必须是CGC2000（SRID=4490），如果不是则会调用空间投影变换函数（ST_Transform）对几何对象的坐标进行转换，请确保能正确转换到CGC2000坐标系统。

本函数将返回几何对象相交的网格对象数组，对于点、线或面数据分别返回对应的网格编码，如下图所示：

示例

select st_astext(st_asgrid(
    ST_geomfromtext('POINT(116.31522216796875 39.910277777777778)',4490), 15));
    
     st_astext      
--------------------
 {G001310322230230}

select st_astext(st_asgrid(
    ST_geomfromtext('LINESTRING(122.48077 51.72814,122.47416 51.73714)',4490), 18));

                  st_astext                                                                          
--------------------------------------------------------------------------------
 {G001331032213300011,G001331032213300013,G001331032213122320,G00133103221312232
2,G001331032213300100,G001331032213122303,G001331032213122321,G00133103221312231
2}

select st_astext(st_asgrid(
  ST_geomfromtext('POLYGON((-0.08077 -0.02814, 0.0482 -0.03, 0.07426 0.03724, -0.08077 -0.02814))',4490),15));

                          st_astext
--------------------------------------------------------------------------------
 {G000000000000000,G000000000000001,G000000000000003,G000000000000010,G000000000
000011,G000000000000012,G000000000000013,G000000000000031,G000000000000102,G0000
00000000120,G100000000000000,G200000000000000,G200000000000001,G200000000000002,
G200000000000003,G200000000000010,G200000000000011,G200000000000012,G20000000000
0013,G300000000000000,G300000000000001,G300000000000002,G300000000000003,G300000
000000010,G300000000000011,G300000000000012,G300000000000013,G300000000000102}

select st_astext(st_asgrid(
  ST_geomfromtext('POLYGON((-0.08077 -0.02814, 0.0482 -0.03, 0.07426 0.03724, -0.08077 -0.02814))',4490),15,true));

                         st_astext
--------------------------------------------------------------------------------
 {G000000000000000,G000000000000001,G000000000000003,G00000000000001,G0000000000
00031,G000000000000102,G000000000000120,G100000000000000,G20000000000000,G200000
00000001,G30000000000000,G30000000000001,G300000000000102}