12

我有以下多边形（在图片中你可以看到它覆盖的区域）

多边形区域

POLYGON((-74.05100448502202 4.7239278424321,-74.05092938316898 4.7241416902206,-74.04830618275201 4.7237460717602,-74.04643668306903 4.7234306460692,-74.04635688735101 4.7234105978214,-74.04636526925401 4.7233310730989,-74.046191260944 4.72327293317,-74.04579027069599 4.7232007594583,-74.04141290558402 4.7214258184083,-74.03746201170497 4.7197791822891,-74.03565688503801 4.7189879401666,-74.033484295736 4.7180897723398,-74.03098447693401 4.7170526009038,-74.028731840457 4.7161167561787,-74.02852820211899 4.7150714370973,-74.026398371001 4.6877232674918,-74.02558060109601 4.6874859863574,-74.02454587610401 4.686797564651,-74.024665108676 4.6863189291555,-74.025470986757 4.6857975214267,-74.02585246812498 4.6846813784365,-74.02580479605103 4.6834369175226,-74.01962984798399 4.684922743491,-74.028472839649 4.6765444849623,-74.032273278366 4.6775012677607,-74.03825980124901 4.6799297676049,-74.048215993474 4.6850422042295,-74.05718496514402 4.6867981911917,-74.05100448502202 4.7239278424321))

当我执行MBRIntersect,MBRContains和Within函数时，它们返回绿色标记在多边形内部，但它不是（如您在图像中看到的）。我正在执行下一句来得到它：

SET @g1 = ST_GeomFromText('POLYGON((-74.05100448502202 4.7239278424321,-74.05092938316898 4.7241416902206,-74.04830618275201 4.7237460717602,-74.04643668306903 4.7234306460692,-74.04635688735101 4.7234105978214,-74.04636526925401 4.7233310730989,-74.046191260944 4.72327293317,-74.04579027069599 4.7232007594583,-74.04141290558402 4.7214258184083,-74.03746201170497 4.7197791822891,-74.03565688503801 4.7189879401666,-74.033484295736 4.7180897723398,-74.03098447693401 4.7170526009038,-74.028731840457 4.7161167561787,-74.02852820211899 4.7150714370973,-74.026398371001 4.6877232674918,-74.02558060109601 4.6874859863574,-74.02454587610401 4.686797564651,-74.024665108676 4.6863189291555,-74.025470986757 4.6857975214267,-74.02585246812498 4.6846813784365,-74.02580479605103 4.6834369175226,-74.01962984798399 4.684922743491,-74.028472839649 4.6765444849623,-74.032273278366 4.6775012677607,-74.03825980124901 4.6799297676049,-74.048215993474 4.6850422042295,-74.05718496514402 4.6867981911917,-74.05100448502202 4.7239278424321))', 4326);
SELECT MBRContains(@g1, ST_PointFromText('POINT(-74.051585 4.680108)', 4326)) g1, 
st_distance(ST_PointFromText('POINT(-74.051585 4.680108)', 4326), @g1) distance

我得到

g1      distance
1   |   0.005489581062607619

但我期待

g1      distance
0   |   0.005489581062607619

我尝试了以下情况：

  • 保存分配 4326 SRID 的几何图形。
  • 使用其他功能，得到相同的响应。

我正在使用 5.7.14 MySQL 版本

我究竟做错了什么？

我解决了这个问题，只是验证没有距离。但是，为什么我会从这些函数中得到这个结果？

4

1 回答 1

7

我现在没有 MySQL 可以玩。所以我首先尝试在 SQL Server Spatial 中复制您的查询。

DECLARE @g1 geometry
DECLARE @h1 geometry
SET @g1= geometry::STGeomFromText('POLYGON((-74.05100448502202 4.7239278424321,-74.05092938316898 4.7241416902206,-74.04830618275201 4.7237460717602,-74.04643668306903 4.7234306460692,-74.04635688735101 4.7234105978214,-74.04636526925401 4.7233310730989,-74.046191260944 4.72327293317,-74.04579027069599 4.7232007594583,-74.04141290558402 4.7214258184083,-74.03746201170497 4.7197791822891,-74.03565688503801 4.7189879401666,-74.033484295736 4.7180897723398,-74.03098447693401 4.7170526009038,-74.028731840457 4.7161167561787,-74.02852820211899 4.7150714370973,-74.026398371001 4.6877232674918,-74.02558060109601 4.6874859863574,-74.02454587610401 4.686797564651,-74.024665108676 4.6863189291555,-74.025470986757 4.6857975214267,-74.02585246812498 4.6846813784365,-74.02580479605103 4.6834369175226,-74.01962984798399 4.684922743491,-74.028472839649 4.6765444849623,-74.032273278366 4.6775012677607,-74.03825980124901 4.6799297676049,-74.048215993474 4.6850422042295,-74.05718496514402 4.6867981911917,-74.05100448502202 4.7239278424321))', 4326);
SET @h1 = geometry::STGeomFromText('POINT(-74.051585 4.680108)', 4326)
SELECT @g1.STContains(@h1) contain, @g1.STDistance(@h1) distance

结果是您可能期望的：

contain      distance
0   |   0.005489581062607675

以下是这背后的原因：

根据您对所查找内容的描述，我使用的是STContains而不是MBRContains 。MBRContains 函数首先在您的多边形上创建一个最小边界矩形，然后使用该新多边形特征进行包含判断。在您的示例中，该点确实落入了多边形的 MBR，这就是为什么您的 MySQL 结果不是您所期望的。STContains 是您正在寻找的正确功能。

官方参考：Mysql空间链接

于 2016-09-20T18:58:47.880 回答