Re: [Qgis-user] extracting elevations from DEM at certain points

[Micha Silver]

On 16/12/2015 07:57, Szilard Albert wrote: Hello, I need to extract elevation values from a DEM at certain points for which I have X and Y values. My points are contained in several profiles, each profile with hundreds of points. My input is a text file, one file per profile,  with the following format: PointA X Y PointB X Y ...... PointZ X Y. I would like a solution where I can feed the above text input, and get my output as another text file with similar format, Point X Y Z (or Point Z X Y). Alternatively just a text file with one column containing Z, but exactly same number of rows, so I can copy and paste to the input. One single command that solves one point only would do as well, I would just create a script file from my every text file for every line.... Any suggestions would be greatly appreciated. I am using QGIS 2.8 Wien in Ubuntu. If you want to work with GRASS, there's an easy workflow for this: # First, as always, create a GRASS location with CRS matching your DEM and points, then # Import your text file into GRASS as a points layer: v.in.ascii input=<your text file> output=points columns="label text, x double, y double" x=2 y=3 sep=space # Add a column to hold elevation v.db.addcolumn map=points column="elev double" # Import DEM raster r.in.gdal input=<your DEM raster> output=dem # As always,set the region g.region -p rast=dem # Now get elevations for all points v.what.rast map=points column=elev raster=dem # And create the output results file v.out.ascii input=points output=points.csv column="elev" sep=space Thank you. Szilard This mail was received via Mail-SeCure System. _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user This mail was received via Mail-SeCure System. -- Micha Silver Arava Drainage Authority cell: +972-523-665918

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