Hi Andy, Can you post a small example? -- Kevin
On 10/21/2010 10:02 AM, lplateandy wrote:
Hi, I have, in the simplest example, a square polygon of 1 by 1 kilometer size with nodes every 25 meters. I can use ST_Simplify (the_geom,5) to remove most of the points. However, for some reason i end up with the four corner nodes and a fifth node 25m clockwise from the top left corner. In itself, this would be fine - 5 nodes is better than 160. However, on some of the polygons, there are more complex boundaries which i wish to smooth out using simplify. I would do this with ST_Simplify (the_geom,26) example - going over the minimum 25 metres between any nodes. In the example of the square with 5 nodes, the problem i find then is that the top left node is removed and the one 25m clockwise remains. The result is that i no longer have a 1km square but sloping Western boundary correctly going 1km North South but incorrectly veering across 25m to the East. Is there a way to remove the stray node so i am more likely to maintain my overall polygon shape. I did try st_simplifiypreservetopology but saw no noticeable difference. Hope that makes sense, any help much appreciated Andy
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