这个SQL Server 2012“超过单半球”错误实际上是SRID错误吗？

Question

我正在尝试将多边形插入SQL Server 2012中的Geography类型字段。

UPDATE tblProjects
SET tblProjects.Boundary = geography::STGeomFromText( 'POLYGON ((-93.30388806760311 27.994401411046173, -94.62224744260311 33.37641235124676, -79.70281384885311 31.80289258670676, -93.30388806760311 27.994401411046173))',4326)
WHERE tblProjects.ProjectID = 1;

尽管我的多边形位于一个半球中，但我得到了以下错误：

Msg 6522, Level 16, State 1, Line 1
A .NET Framework error occurred during execution of user-defined routine or aggregate "geography": 
Microsoft.SqlServer.Types.GLArgumentException: 24205: The specified input does not represent a valid geography instance because it exceeds a single hemisphere. Each geography instance must fit inside a single hemisphere. A common reason for this error is that a polygon has the wrong ring orientation. To create a larger than hemisphere geography instance, upgrade the version of SQL Server and change the database compatibility level to at least 110.
Microsoft.SqlServer.Types.GLArgumentException: 
   at Microsoft.SqlServer.Types.GLNativeMethods.GeodeticIsValid(GeoData& g, Double eccentricity, Boolean forceKatmai)
   at Microsoft.SqlServer.Types.SqlGeography.IsValidExpensive(Boolean forceKatmai)
   at Microsoft.SqlServer.Types.SqlGeography..ctor(GeoData g, Int32 srid)
   at Microsoft.SqlServer.Types.SqlGeography.GeographyFromText(OpenGisType type, SqlChars taggedText, Int32 srid)

我假设这是与空间参考ID相关联的错误，因为以下内容返回NULL：

SELECT distinct Boundary.STSrid AS SRID
FROM dbo.tblProjects;

我在这个假设中是否正确？如何设置SRID？我的尝试返回错误：

UPDATE dbo.tblProjects
SET Boundary.STSrid = 4326;

错误：

Msg 5302, Level 16, State 1, Line 1
Mutator 'STSrid' on 'Boundary' cannot be called on a null value.

Answer 1

所以看起来Ring Orientation确实是个问题。显然，我的Web映射器的输出具有SQL Server想要它们的相反顺序的顶点。我改变了第二个和第三个顶点的顺序（第一个和第三个顶点总是相同，以确保形状是一个完整的多边形） here和UPDATE声明没有任何问题。

现在是解决如何以编程方式解决此问题的有趣部分。