Why not use ST_DWithin with the original triangle, it is the best option regarding speed and precision. Cheers Remi-C Le 10 juin 2015 01:30, "Andy Colson" <a...@squeakycode.net> a écrit :
> At first I thought no, because it creates a circle around a point: > > "Returns a geometry that represents all points whose distance from this > Geometry is less than or equal to distance" > > But now that I read it again, maybe it does do what I'd like. If I pass a > rectangle, it'll return all points <= radius. > > I'll give it a shot and try it out. Thanks for the help. > > -Andy > > > On 06/09/2015 04:48 PM, Basques, Bob (CI-StPaul) wrote: > >> Can you use ST_Buffer?? >> >> bobb >> >> >> >> On Jun 9, 2015, at 4:34 PM, Andy Colson <a...@squeakycode.net> wrote: >>> >>> Hi all. >>> >>> I have buffer selection problem. My site can drop a point, then find >>> all the parcels within 100 feet of that point. No problem. >>> >>> One client however would like to select a parcel (maybe its a square, >>> maybe its a triangle, or any other odd shape), and find all other parcels >>> within 100 feet of any point within the source parcel. >>> >>> 100 is optional. They could choose 50, or 150. >>> >>> I'm not sure how to do something like this. I found ST_Expand, but >>> that'll create a bounding box around the triangle. >>> >>> ST_TransScale could scale it, but I'm not sure what the scale is. The >>> user might type in 50 feet or 150 feet, I'm not sure how to calculate a >>> deltaX and deltaY scale for that. >>> >>> Any hints on how I might go about this? I'm a bit stuck. >>> >>> Thanks, >>> >>> -Andy >>> _______________________________________________ >>> postgis-users mailing list >>> postgis-users@lists.osgeo.org >>> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >>> >> >> _______________________________________________ >> postgis-users mailing list >> postgis-users@lists.osgeo.org >> http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >> >> > _______________________________________________ > postgis-users mailing list > postgis-users@lists.osgeo.org > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users >
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