On Sat, May 19, 2018 at 11:35 AM, Ken Mankoff <[email protected]> wrote: > > Hi GRASS List, > > I've just spent 30 days on a field campaign collecting data. I have a large amount of it in a GRASS mapset with location EPSG:3413. I'd like to set up a new location with (0,0) centered on our basecamp and everything nearby relative to that. Can someone advise how to use "proj" to create a new location centered on either a (lon,lat) location but with units meter, or centered on an (x,y) location from a different projection?
You could create a custom CRS based on EPSG:3413 the PROJ.4 term for EPSG:3413 is: +proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs now get the coordinates of the basecamp, invert the sign of the coordinates and use these as false easting / false northing e.g. if the basecamp is at 4000000, 5000000, use +proj=stere +lat_0=90 +lat_ts=70 +lon_0=-45 +k=1 +x_0=-4000000 +y_0=-5000000 +datum=WGS84 +units=m +no_defs to define a custom projection centered on the basecamp HTH, Markus M > > The reason for this is so I can push data to ParaView which doesn't work well with coordinate systems far removed from the origin. > > Thanks, > > -k. > > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user
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