Re: Incorrect re-projection from EPSG:4326 to 3857
Markus Neteler <[email protected]>
| Newsgroups | gmane.comp.gis.grass.user |
|---|---|
| Message-ID | <CALFmHhvsubRxDV6GKfFqm9dbQDHRjfu611ZKOx7d05R-+s3FuQ@mail.gmail.com> |
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