GIST索引

使用方法

sfmesh类型

1. 创建带sfmesh字段的表。

   create table mesh_gist_test (
       id integer,
       the_mesh sfmesh
   );

2. 插入sfmesh记录。

   insert into mesh_gist_test values(1, '{"version" : 1, "root" : 0, "meshgeoms" : ["MESHGEOM(PATCH(INDEXSURFACE Z (VERTEX(307248.723802283 296449.440306073 6500.00004882812,307248.723802283 296449.440306073 100,307258.460240141 296449.440306073 6500.00004882812,307258.460240141 296449.440306073 100,307258.460240141 296474.440306263 6500.00004882812,307258.460240141 296474.440306263 100,307248.723802283 296474.440306263 6500.00004882812,307248.723802283 296474.440306263 100),INDEX((0,1,2),(3,2,1),(4,5,6),(7,6,5),(3,1,7),(7,5,3),(2,3,4),(5,4,3),(0,2,4),(4,6,0),(1,0,7),(6,7,0)))))"], "primitives" : [{"meshgeom" : 0}], "nodes" : [{"primitive" : 0}]}'::mesh);

3. 在sfmesh字段创建GIST 3D空间索引。

   create index mesh_gist_test_idx on mesh_gist_test using gist (the_mesh);

meshgeom类型

1. 创建带meshgeom字段的表。

   create table meshgeom_gist_test as select id, meshgeom(the_mesh) as the_mgeom from mesh_gist_test;

2. 在meshgeom字段创建GIST 3D空间索引。

   CREATE INDEX meshgeom_gist_test_idx on meshgeom_gist_test using gist (the_mgeom);