SQL Server 2012 :: Geography Data Type - Test If Point Is Inside A Closed Polygon
Dec 5, 2013
I have a closed polygon that coincidently is in the shape of Iowa :) I have a point that is within the state and a point WELL outside it, but I get weird results that I don't expect when I try to get it to tell me that the point is within the polygon. Here is some basic code, with long coordinates data.
DECLARE @g geography,
@pIn geography,
@pOut geography
SET @g = geography::STPolyFromText('POLYGON((-91.119987 40.705402, -91.129158 40.682148, -91.162498 40.656311, -91.214912 40.643818, -91.262062 40.639545, -91.375610 40.603439, -91.411118 40.572971, -91.412872 40.547993, -91.382103 40.528496, -91.374794 40.503654, -91.385399 40.447250, -91.372757 40.402988, -91.385757 40.392361, -91.418816 40.386875, -91.448593 40.371902, -91.476883 40.390968, -91.490158 40.390762, -91.500221
[code]...
(1 row(s) affected)As I read that there is a distance of about 7864 meters, this is close to what I would expect, so that's ok. The point outside I would expect a distance as well so that is confusing.. Then we have the intersects, it says that the point inside does NOT intersect but the one outside DOES, this is backed up by the intersection values.
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Nov 5, 2015
I have a table that contains spatial points and the name of the polygon they belong to (geography and varchar columns). I need to write a function to accept a point and determine which polygon contains that point. How can I write the query so that it will search through each polygon (derived from the geography points found in the table) and return the name of the polygon that contains that point?
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Feb 18, 2005
HI:
Is there any algorithim, which can help me write a script or SQL that will select all the points within a Closed Polygon.
This polygon and point data have latitude and longitude information
Help will be appreciated.
Thanks
Namita
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I've got a table with lat/longs for specific points:
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)
I have another table with polygon borders as lat/longs:
CREATE TABLE [Polygon] (
[PolygonID] [int],
[PointNum] [int],
[Lat] [numeric](10, 6),
[Lon] [numeric](10, 6)
)
What I need to do, is come up with a script that will determine which Polygon contains each point. I'd like to be able to assign a PolygonID to each record in the Point table, or give it a 0 if there is no polygon that contains that point.
I'm looking for a way to do this within SQL Server (or possibly with the use of an extended stored procedure if necessary).
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