计算线与线相交的距离

Question

我希望我在这里有足够的细节可以理解！

我已经创建了一个在列中包含几何线的表。该表使用以下输入填充：

INSERT INTO tblLines ("geomLines") VALUES (geometry::STGeomFromText('LINESTRING (10 15, 100 100, 120 79, 90 40, 80 5)', 0));
INSERT INTO tblLines ("geomLines") VALUES (geometry::STGeomFromText('LINESTRING (75 25, 50 150, 120 120, 135 40)', 0));

结果表tblLines如下：

fidID     geomLines
1         wkt
2         wkt

然后我在动态行AB中创建了

SET @AB = geometry::STGeomFromText('LINESTRING (60 40, 100 140)', 0);

所以总结我所有的数据看起来像这样：

我现在可以使用：

DECLARE @AB GEOMETRY = geometry::STGeomFromText('LINESTRING (60 40, 100 140)', 0);
DECLARE @A GEOMETRY = geometry::STGeomFromText('POINT (60 40)', 0);
-- Combined multipoint value
DECLARE @ABINT GEOMETRY = (SELECT  GEOMETRY::UnionAggregate(@AB.STIntersection(geomLines)) FROM tblLines WHERE @AB.STIntersects ( geomLines ) = 1);

SELECT * 
FROM tblLines
WHERE @ABINT.STDistance(geomLines) < 0.01
ORDER BY @A.STDistance(@ABINT) ASC;

这会产生AB交叉线的相当不错的摘要，但是在两件事上确实失败了：

1-它没有显示“ 2”所期望的重复

2-@ A.STDistance（@ABINT）始终是从A到第一个多点的度量，而不是我希望的每个多点。

我希望能做到这一点：

[Intersected Line] [Distance along AB]
2                  18
1                  25
2                  60

有人有什么提示吗？

Answer 1

测试数据

CREATE TABLE #tblLines( geomLines GEOMETRY )
INSERT INTO #tblLines (geomLines) VALUES (geometry::STGeomFromText('LINESTRING (10 15, 100 100, 120 79, 90 40, 80 5)', 0));
INSERT INTO #tblLines (geomLines) VALUES (geometry::STGeomFromText('LINESTRING (75 25, 50 150, 120 120, 135 40)', 0));

解决方案

DECLARE @AB GEOMETRY = geometry::STGeomFromText('LINESTRING (60 40, 100 140)', 0);
-- Combined multipoint value
SELECT  GEOMETRY::UnionAggregate(@AB.STIntersection(geomLines)) FROM #tblLines WHERE @AB.STIntersects ( geomLines ) = 1

贷方转到https://stackoverflow.com/a/8247981/6305294