Re: [Qgis-user] Extract raster cell-value statistics (min, max, count, sum) within a polygone

[Micha Silver]

On 04/29/2015 03:15 PM, Johan Nilsson wrote: Have now tried to run v.rast.stats in Grass 7.0. It start and run 100% off one core in hours, until a file in ~/grassdata/location/PERMANENT/.tmp/ inflate to the disk is full, approximate 150GB :( Whoa! Check the region settings before you try again: g.region -p This is FAQ #0 for all work with GRASS. The v.rast.stats module works by first rasterizing the vector polygons into a temporary raster. If you region is very large, and resolution setting is very small, you might be getting a huge temporary raster.   Have made topology check on the vector-data and imported it to grassdb. Will see if I can collect usefull data and ask on grass-user list. Stupid Ubuntu 14.04  to not messure invisible files in the normal file-manager, had gone faster to pinpoint the problem. /Cheers 2015-04-19 18:54 GMT+02:00 Micha Silver <mi...@arava.co.il>: On 04/19/2015 12:34 PM, Johan Nilsson wrote: Zonal statistics work well to extract, numers of cells(counts) , sum of the value (sum)  and also average (mean) But I want the minimum AND max-value and also standard error, if possible. Is there another plugin or a tutorial how it may bee done in another way. The GRASS module v.rast.stats does what you want. But it's not in the Processing toolbox. You can import your raster into a GRASS mapset then do the analysis directly within GRASS. The code to Zonal statistics are here, but I'm total lost in how it work. https://github.com/qgis/QGIS/blob/a2f51260db5357917e86b78f1bb2915379d670dd/src/analysis/vector/qgszonalstatistics.cpp /Cheers This mail was received via Mail-SeCure System. _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System. This mail was received via Mail-SeCure System.

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