我有一列geography个多边形.对于多边形中的点查找性能，此列已为ST_Subdivided.
当我在距离具有geography类型的多边形的边缘<；10m的点之间执行ST_Intersects时，我得到false.但在转换到geometry种类型后，我得到了true种:
SELECT
ST_Intersects(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape) AS intersects_geog,
ST_Intersects(ST_GeogFromText('POINT(-118.46131 34.31171)')::geometry, latlong_shape::geometry) AS intersects_geom
FROM region_ids_for_latlong_shapes
WHERE ST_Distance(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape) < 10;
| intersects_geog | intersects_geom |
| --------------- | --------------- |
| false | true |
| false | false |
我知道ST_Intersects(geography, geography)和ST_Intersects(geometry, geometry)之间存在预期的差异，但我不明白为什么它们会出现在这种情况下:
- 几何是有效的
- 即使这是一些很大的圆差异，我也希望点是与其中一个多边形相交，而不是在两个多边形外.
我理解我将can强制转换为geometry种类型，但令我惊讶的是ST_Intersect‘S geography的支持在这里不起作用.有没有在没有选角的情况下准确地做到这一点？
以下是点和最接近的两个形状:
更多诊断信息:
SELECT
ST_Intersects(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape) AS geogs_intersect,
ST_Intersects(ST_GeogFromText('POINT(-118.46131 34.31171)')::geometry, latlong_shape::geometry) AS geoms_intersect,
ST_IsValid(latlong_shape::geometry) AS geom_isvalid,
ST_Relate(ST_GeogFromText('POINT(-118.46131 34.31171)')::geometry, latlong_shape::geometry) AS relate_geoms,
ST_Distance(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape) AS geogs_distance,
ST_Distance(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape, false) AS geogs_no_spheroid_distance,
ST_Distance(ST_GeogFromText('POINT(-118.46131 34.31171)')::geometry, latlong_shape::geometry) AS geoms_distance,
ST_3DDistance(ST_GeogFromText('POINT(-118.46131 34.31171)')::geometry, latlong_shape::geometry) AS geoms_3d_distance
FROM region_ids_for_latlong_shapes
WHERE ST_Distance(ST_GeogFromText('POINT(-118.46131 34.31171)'), latlong_shape) < 10
| geogs_intersect | geoms_intersect | geom_isvalid | relate_geoms | geogs_distance | geogs_no_spheroid_distance | geoms_distance | geoms_3d_distance |
| --------------- | --------------- | ------------ | ------------ | -------------- | -------------------------- | ----------------------- | ----------------------- |
| false | true | true | 0FFFFF212 | 3.4064663 | 3.4146671 | 0 | 0 |
| false | false | true | FF0FFF212 | 5.63478588 | 5.64835122 | 0.000054321999996886916 | 0.000054321999996886916 |
SELECT VERSION()
| version |
| ----------------------------------------------------------------------------------------------------------------- |
| PostgreSQL 13.9 on x86_64-apple-darwin19.6.0, compiled by Apple clang version 11.0.3 (clang-1103.0.32.62), 64-bit |
SELECT PostGIS_Version();
| postgis_version |
| ------------------------------------- |
| 3.1 USE_GEOS=1 USE_PROJ=1 USE_STATS=1 |
为方便起见，下面是我在上面看到的GeoJSON.它包含查找点和两个最近的多边形(由ST_AsGeoJSON返回):
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Point",
"coordinates": [
-118.46131,
34.31171
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-118.590173754,
34.818203384
],
[
-118.554669477,
34.818248424
],
[
-118.519233938,
34.81833323
],
[
-118.500917157,
34.818263939
],
[
-118.484492998,
34.818255519
],
[
-118.466714818,
34.818356235
],
[
-118.431575103,
34.818707983
],
[
-118.413900556,
34.818924424
],
[
-118.396521556,
34.819207589
],
[
-118.375913258,
34.819322959
],
[
-118.326206757,
34.819675701
],
[
-118.298911338,
34.819887117
],
[
-118.298911338,
34.747356668
],
[
-118.30726467,
34.747324674
],
[
-118.311221449,
34.747259523
],
[
-118.315177432,
34.747194256
],
[
-118.316156934,
34.747178062
],
[
-118.31616929,
34.747315306
],
[
-118.316271488,
34.752065567
],
[
-118.312325229,
34.752140489
],
[
-118.312326535,
34.75219544
],
[
-118.312531114,
34.760874375
],
[
-118.311419271,
34.760887938
],
[
-118.311447254,
34.761794819
],
[
-118.307547133,
34.761876226
],
[
-118.307688072,
34.76914709
],
[
-118.312139537,
34.769051848
],
[
-118.312013231,
34.761782985
],
[
-118.320871559,
34.761596736
],
[
-118.320643006,
34.751982309
],
[
-118.32518382,
34.751892427
],
[
-118.325146684,
34.750645594
],
[
-118.320698938,
34.750725582
],
[
-118.320619613,
34.747238796
],
[
-118.320621472,
34.74711144
],
[
-118.319132498,
34.74712522
],
[
-118.31912928,
34.746989586
],
[
-118.318963759,
34.742294886
],
[
-118.324094459,
34.742214348
],
[
-118.324100254,
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],
[
-118.324765599,
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],
[
-118.324902701,
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],
[
-118.324782787,
34.739791629
],
[
-118.324656399,
34.739792562
],
[
-118.321818215,
34.73983491
],
[
-118.321723743,
34.737421328
],
[
-118.318794936,
34.737463571
],
[
-118.318943061,
34.741690458
],
[
-118.315014788,
34.741751738
],
[
-118.314961133,
34.739937086
],
[
-118.311042888,
34.739996866
],
[
-118.311131734,
34.743628911
],
[
-118.307195019,
34.743692679
],
[
-118.307022176,
34.73292151
],
[
-118.307017236,
34.732701729
],
[
-118.306961869,
34.729197417
],
[
-118.311327393,
34.729174956
],
[
-118.311346965,
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],
[
-118.3113478,
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],
[
-118.311351901,
34.732727164
],
[
-118.315711282,
34.73267014
],
[
-118.315713308,
34.732587934
],
[
-118.315701602,
34.729152316
],
[
-118.320071884,
34.729129528
],
[
-118.320062563,
34.725505708
],
[
-118.315688277,
34.725527134
],
[
-118.315674941,
34.721907411
],
[
-118.320054027,
34.721894246
],
[
-118.320044883,
34.718366592
],
[
-118.320044698,
34.71828416
],
[
-118.318949128,
34.718285882
],
[
-118.317852726,
34.718287568
],
[
-118.316757189,
34.718289242
],
[
-118.315661616,
34.718290466
],
[
-118.315591765,
34.711052422
],
[
-118.31177053,
34.711045178
],
[
-118.306851348,
34.711035697
],
[
-118.306807821,
34.703851184
],
[
-118.306807578,
34.703768345
],
[
-118.311163994,
34.703793557
],
[
-118.311164549,
34.703710593
],
[
-118.311153205,
34.700151308
],
[
-118.315521476,
34.700168694
],
[
-118.315520836,
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],
[
-118.315520196,
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],
[
-118.315519752,
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],
[
-118.315519343,
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],
[
-118.315518911,
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],
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],
[
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],
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],
[
-118.324240593,
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],
[
-118.324199826,
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],
[
-118.324181765,
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],
[
-118.324013286,
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],
[
-118.321990626,
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],
[
-118.319802221,
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],
[
-118.319789286,
34.676482105
],
[
-118.319776231,
34.674800764
],
[
-118.319777068,
34.674668997
],
[
-118.324156113,
34.674640133
],
[
-118.324305833,
34.667353292
],
[
-118.324299819,
34.665534142
],
[
-118.324196404,
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],
[
-118.319819256,
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],
[
-118.319836703,
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],
[
-118.321427846,
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],
[
-118.322854394,
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],
[
-118.324355708,
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],
[
-118.324379145,
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],
[
-118.322436434,
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],
[
-118.320078162,
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],
[
-118.319016614,
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],
[
-118.318265028,
34.659228426
],
[
-118.317204016,
34.65892139
],
[
-118.316696353,
34.658343507
],
[
-118.316433733,
34.657886214
],
[
-118.316399174,
34.657374451
],
[
-118.316233563,
34.656701388
],
[
-118.315872914,
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],
[
-118.315317537,
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],
[
-118.314716272,
34.655843026
],
[
-118.314152005,
34.656042868
],
[
-118.313658715,
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],
[
-118.31325996,
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],
[
-118.312825923,
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],
[
-118.312240655,
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],
[
-118.311823758,
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],
[
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],
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-118.310486705,
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],
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],
[
-118.308409437,
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],
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],
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],
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],
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],
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],
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],
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],
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],
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],
[
-118.590173754,
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],
[
-118.590173754,
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]
]
]
}
},
{
"type": "Feature",
"properties": {},
"geometry": {
"type": "Polygon",
"coordinates": [
[
[
-118.625390854,
34.05061708
],
[
-118.625390854,
34.311655678
],
[
-118.456022326,
34.311655678
],
[
-118.456022326,
34.05061708
],
[
-118.625390854,
34.05061708
]
]
]
}
}
]
}
