几何线与多边形的交点返回 null

Question

我正在尝试根据线中点与多边形相交的结果设置一列。我知道我可以用类似的东西来调用线中点

  X_Coord = SHAPE.STPointN(SHAPE.STNumPoints()/2).STX ,  
  Y_Coord = SHAPE.STPointN(SHAPE.STNumPoints()/2).STY 

但是如何将其传递给

update GRSM_ROADS
set QuadName = USGS_24K_TOPOMAP_BOUNDARIES.NAME
from  GRSM_ROADS
inner join USGS_24K_TOPOMAP_BOUNDARIES
on dbo.GRSM_ROADS.Location_ID = GRSM_ROADS.Location_ID
where (USGS_24K_TOPOMAP_BOUNDARIES.SHAPE.STIntersects(dbo.GRSM_ROADS.shape) = 1);

是个谜。我尝试了运行的 stcontains 和 stintersects，但输出为空，这表明我没有正确确定线中点何时或何处与多边形相交。

SQL 2008 R2

Answer 1

where (USGS_24K_TOPOMAP_BOUNDARIES.SHAPE.STIntersection(dbo.GRSM_ROADS.shape).STDimension() = 1);

Stdimension 解决了！