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seen Aug 19 at 17:58

Aug
11
comment Get relative north aligned point 2163 (US Equal Area)
Okay! Write back if you have questions about the details of changing projections in PostGIS. Hopefully someone with more experience with it will chime in.
Aug
11
revised Get relative north aligned point 2163 (US Equal Area)
added 50 characters in body
Aug
11
answered Get relative north aligned point 2163 (US Equal Area)
Aug
11
comment Get relative north aligned point 2163 (US Equal Area)
No, not necessarily. If you rotate the grid and leave the coordinate system the same, your top will not be due north of your bottom.
Aug
11
comment Get relative north aligned point 2163 (US Equal Area)
It would seem that your grid is north-aligned. It just isn't orthogonal on the screen. Are you asking for a projection that will make your grid both north-aligned and orthogonal?
Aug
10
answered Converting point data into a weighted raster
Aug
10
awarded  Autobiographer
Aug
10
comment Create overlapping polygons from contour lines
I've accepted whuber's answer, as it gives me exactly what I was looking for, but I think there may be other answers for the general case. Several I had found include using XTools or ET Geowizards to convert the polylines to polygons, or else removing the holes from the non-overlapping polygons.
Aug
10
accepted Create overlapping polygons from contour lines
Aug
10
comment How to cluster points based on a kernel density?
This solution is simple, quick, and exactly what I was looking for. Thanks.
Aug
10
accepted How to cluster points based on a kernel density?
Aug
10
awarded  Commentator
Aug
10
comment Create overlapping polygons from contour lines
This answer perfectly solves my problem from yesterday as well. If you post it there, I will accept it as the best answer.
Aug
10
awarded  Scholar
Aug
10
comment Create overlapping polygons from contour lines
This is exactly what I needed, and in fact it's much better than what I hoped for. The watershed tool actually gives me exactly the polygons I was looking for in both questions - a polygon that separates the kernel density raster into regions. The method I was attempting here would have only approximated them using the largest contour that only enclosed one maxima, but it would have left gaps. This is perfect. Thank you!
Aug
10
comment Create overlapping polygons from contour lines
Yes, that's correct. In many forums it seems as though many people have had the opposite problem of trying to convert overlapping polygons to cocentric, non-overlapping ones. (including this particularly thorough one from our own whuber: link)
Aug
10
awarded  Editor
Aug
10
revised Create overlapping polygons from contour lines
Made question more clear
Aug
10
asked Create overlapping polygons from contour lines
Aug
9
comment How to cluster points based on a kernel density?
And also posted by me, as it turns out.