Re: [GRASS-user] db.out.ogr issues

[Micha Silver]

Pardon for butting in... On 08/10/2018 04:45 PM, Rich Shepard wrote: On Thu, 9 Aug 2018, Daniel Victoria wrote: Try using v.to.db to add the coordinates of each point to the attribute table and then export it using DB.out.ogr. Daniel,   The points have an elevation -- in feet -- associated with the geographic location. Is there a grass module that will convert that attribute table column to meters (the location's lenth units)? Or, should I do this on the source data and re-import/re-project these data? If I understand, you have a vector of points with x,y and z in the attribute table, and you want to transform to some different coordinate system, while also transforming the elevation. In that case it might make sense to save the attribute table as an ASCII (csv) file, then use v.in.ascii with the -z flag to create a 3D vector (pointing to the elev column as "z=..."). Then when you transform to the new CRS, v.proj will also transform the elevation. In the new LOCATION, add three new columns to the vector: east,west,new_elev. Then use v.to.db to uploads the values with the "option=coor" and "columns=east,north,new_elev". That should give you the new x coords, y_coords and new elevation. HTH Regards, Rich _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918

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