I don't understand what is a 3D polyline. Your 3D points have x, y coordinates and a z value. If you make your polyline from a selection of points in a raster DEM, you will just have a polyline representing something from the 3D. With st_simplifiy, you will symplify this representation.
Instead your polyline is a multiline, I think you can use st_simplify instead of st_simplifypreservetopology. Hugues. -------- Message d'origine-------- De: postgis-users-boun...@postgis.refractions.net de la part de Ed Linde Date: dim. 17/06/2012 11:30 À: PostGIS Users Discussion Objet : [postgis-users] 3D polyline simplify Does *ST_SimplifyPreserveTopology : *work with a 3D polyline as well? So if I had a linestring which I composed from several 3D points using ST_MakeLine, would the DP algorithm still work? Cheers, Ed* *
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