[英]Geo functions from SQL Server 2008 to C# (latitude and longitude points inside or outside polygon/map area)
在SQL Server 2008中,我有:
Declare @pointIn geometry
Declare @pointOut geometry
Declare @polygon geometry
SET @polygon = geometry::STGeomFromText('POLYGON((40 -9,40 -6,35 -6,35 -9,40 -9))', 4326)
SET @pointIn = geometry::STGeomFromText('POINT (39 -8)', 4326)
SET @pointOut = geometry::STGeomFromText('POINT (41 -3)', 4326)
select @polygon.STIntersects(@pointIn)
select @polygon.STIntersects(@pointOut)
正如预期的那样,我得到了结果1
和0
。
现在我尝试使用库将相同的代码带到C#: Microsoft.SqlServer.Types.dll
使用以下代码:
var p1lat = 40;
var p1long = -9;
var p2lat = 40;
var p2ong = -6;
var p3lat = 35;
var p3ong = -6;
var p4lat = 35;
var p4ong = -9;
var pILat = 39;
var pILong = -8;
var pOLat = 41;
var pOLong = -3;
System.Threading.Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US");
const string polygonFormat = "POLYGON(({0} {1},{2} {3},{4} {5},{6} {7},{0} {1}))";
var polygon = string.Format(polygonFormat, p1lat, p1long, p2lat, p2ong, p3lat, p3ong, p4lat, p4ong);
var geometryString = new SqlChars(new SqlString(polygon));
var area = SqlGeography.STPolyFromText(geometryString, 4326);
var pointIn = SqlGeography.Point(pILat, pILong, 4326);
var pointOut = SqlGeography.Point(pOLat, pOLong, 4326);
Console.WriteLine(area.STIntersects(pointIn));
Console.WriteLine(area.STIntersects(pointOut));
我总是得到False
, False
......它应该是True
, False
有人可以帮忙吗?
谢谢
SqlGeography.Point
和SqlGeography.STPointFromText
使用不同的坐标顺序。 请尝试以下解决方案之一来解决此问题:
SqlGeography.Point
方法调用中交换坐标; SqlGeography.STPointFromText
)创建点。
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