Hi there, I just tried the same 4326 to 3857 re-projection with dockerized 7.5 trunk. The results are correct.
Thanks so much! Drew On Thu, Jan 4, 2018 at 10:38 AM, Markus Neteler <[email protected]> wrote: > On Thu, Jan 4, 2018 at 6:25 PM, Markus Metz > <[email protected]> wrote: > > On Thu, Jan 4, 2018 at 9:08 AM, Helmut Kudrnovsky <[email protected]> wrote: > >> > >> Zhiyu (Drew) Li wrote > >> > Hi there, > >> > > >> > I was trying to re-project a EPSG:4326 coordinate into EPSG:3857 using > >> > GRASS, but I found GDAL gave me a different result. > >> > > >> > GRASS (7.2.2): > ... > > Regarding EPSG:3857: > > Uses spherical development of ellipsoidal coordinates. Relative to WGS > 84 / > > World Mercator (CRS code 3395) errors of 0.7 percent in scale and > > differences in northing of up to 43km in the map (equivalent to 21km on > the > > ground) may arise. > > > > This has been fixed in recent GRASS 7.4 and GRASS 7.5, providing same > > results like GDAL. > > I have added a related note here for the upcoming 7.4.0 release: > > https://trac.osgeo.org/grass/wiki/Release/7.4.0-News#Projectionsupport > > markusN > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user >
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