Thanks, I’m using the technique described at http://blog.mathieu-leplatre.info/drape-lines-on-a-dem-with-postgis.html
What would be small tiles in this context? 256x256? The raster I was testing against was ~1200x1200. -ra On 27 Aug 2014, at 16:19, Pierre Racine <[email protected]> wrote: > Elevation profile should be quite fast depending on how you tile your raster > coverage. Smaller tiles make computation faster. Index them and make sure > your query is actually using the index. > > Pierre > >> -----Original Message----- >> From: [email protected] [mailto:postgis-users- >> [email protected]] On Behalf Of Rasmus Aveskogh >> Sent: Friday, August 22, 2014 4:10 PM >> To: [email protected] >> Subject: [postgis-users] Elevation profiles from rasters >> >> Hi! >> >> How hard/feasible would it be to implement elevation profile/drape line >> functionality in PostGIS? Since PostGIS already depends on GDAL I assume >> making use of the GDAL API would make this quite easy, such as in the Zoo- >> Project service: >> >> http://www.zoo-project.org/trac/browser/trunk/zoo-project/zoo- >> services/gdal/profile/service.c >> >> Providing functionality that could eventually be used for applications like: >> http://www.zoo-project.org/site/ZooWebSite/Demo/GdalProfile (using the >> code above) >> >> I'm currently using an ad-hoc PostGIS-function to pull out elevation profiles >> from my rasters, but it's quite slow and CPU intensive and as such does not >> make a good fit as a backend service for a web application like the above. >> >> -ra > _______________________________________________ > postgis-users mailing list > [email protected] > http://lists.osgeo.org/cgi-bin/mailman/listinfo/postgis-users
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