Re: [GRASS-user] db.out.ogr issues [RESOLVED]
On Fri, 10 Aug 2018, Micha Silver wrote: I was trying to point out that, regardless if the units are meters or feet, when you transform to a different CRS, you change all three values of the location, x,y and z. For example: micha@TP480:~$ echo "35.3 30.8 -180" | cs2cs +init=epsg:4326 +to +init=epsg:2039 228595.08 523262.05 -200.28 In the EPSG 2039 CRS my elevation has "dropped" by 20 meters (!) compared to WGS84 Micha, Global warming? :-) With my data set the original and converted data for one station have the same elevation (in meters): Rhododendron 3.8 NW,45.3596,-121.9742,399.9 Rhododendron 3.8 NW,2384511.31243653,189175.421986476,399.9 Best regards, Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] db.out.ogr issues [RESOLVED]
On 08/10/2018 05:45 PM, Rich Shepard wrote: On Fri, 10 Aug 2018, Micha Silver wrote: 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. I must not yet be sufficiently cafinated this morning. When I look again at the input and v.out.ogr files I now see that I had transformed the elevation column to meters when my gawk script extracted columns from the source data. I was trying to point out that, regardless if the units are meters or feet, when you transform to a different CRS, you change all three values of the location, x,y and z. For example: micha@TP480:~$ echo "35.3 30.8 -180" | cs2cs +init=epsg:4326 +to +init=epsg:2039 228595.08 523262.05 -200.28 In the EPSG 2039 CRS my elevation has "dropped" by 20 meters (!) compared to WGS84 Cheers -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
Re: [GRASS-user] db.out.ogr issues [RESOLVED]
On Fri, 10 Aug 2018, Micha Silver wrote: Pardon for butting in... Micha, It was not a private conversation. 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. I must not yet be sufficiently cafinated this morning. When I look again at the input and v.out.ogr files I now see that I had transformed the elevation column to meters when my gawk script extracted columns from the source data. Mea culpa! Rich ___ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user
