sql - sql server中地理多边形区域的中心纬度和经度

Question

我有一个如下创建的地理多边形

DECLARE @polyString as varchar(max);
SET @polyString = 'POLYGON((' + @eastAsString + ' ' + @northAsString +',' + @westAsString + ' ' + @northAsString + ',' + @westAsString + ' '+@southAsString +','+ @eastAsString + ' ' + @southAsString +',' +@eastAsString +' ' +@northAsString +'))';

DECLARE @g geography;
SET @g = geography::STPolyFromText(@polyString, 4326)

我想找到多边形的中心纬度/经度？这可能在sql server内部吗？

Answer 1

您可以使用类型的EnvelopeCenter()方法geography。

DECLARE @polyString as varchar(max);
SET @polyString = 'POLYGON((' + @eastAsString + ' ' + @northAsString +',' + @westAsString + ' ' + @northAsString + ',' + @westAsString + ' '+@southAsString +','+ @eastAsString + ' ' + @southAsString +',' +@eastAsString +' ' +@northAsString +'))';

DECLARE @g geography;
SET @g = geography::STPolyFromText(@polyString, 4326)
SELECT @g.EnvelopeCenter().ToString()

定义多边形中心的确切含义会很有帮助，因为有不同的定义方法。