Hi Daniel, Do you want regular cells or polygons?
There are a few approaches for generating voronoi polygons in Postgis: eg: http://www.bostongis.com/PrinterFriendly.aspx?content_name=postgresql_plr_tut02 http://geogeek.garnix.org/2012/04/faster-voronoi-diagrams-in-postgis.html If your points already represent the centre of cells, then a fishnet approach would work, generate a mesh to match the grid, then do a spatial join on points inside cells to generate the match. You just need to know the extent & size of the grid: http://trac.osgeo.org/postgis/wiki/UsersWikiCreateFishnet HTH, Brent Wood --- On Sun, 9/9/12, Daniel Cole <dan...@southernsolutionsms.com> wrote: From: Daniel Cole <dan...@southernsolutionsms.com> Subject: [postgis-users] create 1 cell/polygon per point inside bounding polygon To: postgis-users@postgis.refractions.net Date: Sunday, September 9, 2012, 3:02 PM I want to be able to take a polygon that has 3 to 50 points inside of it and create polygon where each point is the only point inside of it a cell and it is located at the centroid, or at least close. The points are already in a sort of grid shape, so want my cells as uniform size as possible although I assume the cells containing the outer-most points may be larger or smaller. Any cell on the outer edges will be clipped by the original bounding polygon. I thought that I might could use something like fishnetting, but I want to be sure that there are just the same number of cells are there are points. I have attached an image that I made using the nearest neighbor algorithm and I think and the look is basically what I wanting to do, but where you see the color there, there would be a cell unique to that point. If anyone knew anway to reverse that raster into cells that would help too. thanks. any thoughts? DC -----------------------------------------------------------Daniel Cole -----Inline Attachment Follows----- _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
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