<div dir="ltr">For example:<div><br><div>For a DEM raster X: 5261 Y: 4401 the vectorisation take 1 hour so I tintk that something is wrong on my querie<br><br>Le lundi 20 juillet 2015 15:18:42 UTC+2, Paul Ramsey a écrit :<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">I would expect the vectorization of a raster to be fairly slow.<br>Exactly how slow is another question.<p>On Mon, Jul 20, 2015 at 6:14 AM, Elmehdi OUADOUD<br><<a href="javascript:" target="_blank" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">ouadoud...@gmail.com</a>> wrote:<br>> Hi,<br>><br>> I wonder know if the very very slow process is normal or i'm missing<br>> something?<br>><br>> thanks in advance<br>><br>> Le mercredi 15 juillet 2015 10:11:46 UTC+2, Elmehdi OUADOUD a écrit :<br>>><br>>> Hi All,<br>>><br>>> I want to transfom a raster data to polygons but the process is too slow<br>>> it takes 35 minutes.<br>>> The querie i'm using :<br>>><br>>>        select (ST_DumpAsPolygons(a.raster)).geom,<br>>> (ST_DumpAsPolygons(a.raster)).val<br>>>        from my_raster a<br>>><br>>> Dimensions of my_raster<br>>><br>>> X: 5261 Y: 4401<br>>><br>>><br>>> I'm missing something or it's normal ?<br>>><br>>><br>><br>> _______________________________________________<br>> postgis-users mailing list<br>> <a href="javascript:" target="_blank" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">postgi...@lists.osgeo.org</a><br>> <a href="http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;">http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users</a><br>_______________________________________________<br>postgis-users mailing list<br><a href="javascript:" target="_blank" rel="nofollow" onmousedown="this.href='javascript:';return true;" onclick="this.href='javascript:';return true;">postgi...@lists.osgeo.org</a><br><a href="http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users" target="_blank" rel="nofollow" onmousedown="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;" onclick="this.href='http://www.google.com/url?q\75http%3A%2F%2Flists.osgeo.org%2Fcgi-bin%2Fmailman%2Flistinfo%2Fpostgis-users\46sa\75D\46sntz\0751\46usg\75AFQjCNFq7nnxngR7sOb6icF73DL5HQVrbA';return true;">http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users</a></p></blockquote></div></div></div>