您是否设法运行 STBuffer on MULTIPOLYGONS ？使用 SQL 服务器？

Question

在 SQL 服务器地理空间中，我无法运行 STBuffer 用于 MULTIPOLYGONS。

DECLARE @g geography = geography::STMPolyFromText('MULTIPOLYGON(((1 1, 1 -1, -1 -1, -1 1, 1 1)),((1 1, 3 1, 3 3, 1 1)))', 4326);  

SELECT @g   -- no problem to run
SELECT @g.ToString()  -- no problem to run
SELECT @g.STBuffer(1).ToString();  -- error

返回的错误是：

Msg 6522, Level 16, State 1, Line 64
A .NET Framework error occurred during execution of user-defined routine or aggregate "geography":

System.ArgumentException: 24144: This operation cannot be completed because the instance is not valid. Use MakeValid to convert the instance to a valid instance. Note that MakeValid may cause the points of a geometry instance to shift slightly. System.ArgumentException:

Answer 1

我认为这是因为您创建的多边形无效 geography 多边形。尝试使用一组有效的 Latitude/Longitude 值创建多边形。

使用 geometry 数据类型执行相同的代码似乎可行。

DECLARE @g geometry = geometry::STMPolyFromText('MULTIPOLYGON(((1 1, 1 -1, -1 -1, -1 1, 1 1)),((1 1, 3 1, 3 3, 1 1)))', 4326);  

select 
    geoMultiPolys = @g, 
    geoMultiPolysString = @g.ToString(),
    buffered = @g.STBuffer(1),
    bufferedString = @g.STBuffer(1).ToString(),
    IsValid = @g.STIsValid()

同样适用于地理

DECLARE @g geography = geography::STMPolyFromText('MULTIPOLYGON (((40 40, 20 45, 45 30, 40 40)), ((20 35, 10 30, 10 10, 30 5, 45 20, 20 35), (30 20, 20 15, 20 25, 30 20)))', 4326);  

select 
    geoMultiPolys = @g, 
    geoMultiPolysString = @g.ToString(),
    buffered = @g.STBuffer(1),
    bufferedString = @g.STBuffer(1).ToString(),
    IsValid = @g.STIsValid()

您是否设法运行 STBuffer on MULTIPOLYGONS ？使用 SQL 服务器？

Did you manage to run STBuffer on MULTIPOLYGONS ? With SQL Server?

sql

sql-server

sqlgeography

您是否设法 运行 STBuffer on MULTIPOLYGONS ？使用 SQL 服务器？

Did you manage to run STBuffer on MULTIPOLYGONS ? With SQL Server?

sql

sql-server

sqlgeography

您是否设法运行 STBuffer on MULTIPOLYGONS ？使用 SQL 服务器？