Re: Axis-orientation in GRASS GIS
Markus Neteler <[email protected]>
| Newsgroups | gmane.comp.gis.grass.devel |
|---|---|
| Message-ID | <CALFmHhtptrcj7Hh2ecp5H2AVxstG8aWm2YPSAsD3dKgU=HnFiQ@mail.gmail.com> |
On Wed, Dec 2, 2020 at 10:43 PM Stefan Blumentrath <[email protected]> wrote: > > Dear devs, > > One of my colleagues is working on a GRASS module for parametrized viewsheds. > > In that context she asked if the Y-axis in GRASS GIS (and in amongst other raster2numpy in particular) always refers to north-south direction/coordinates, even if the CRS of the location is one of the weird CRS that label north-south-direction as X-axis? Since I could not answer that question with full confidence I am forwarding it to this list. > > Is it safe to assume that Y always refers to North-South in GRASS GIS? Probably no: to my knowledge at least the Krovak's Projection (used in Czech Republic / Slovak Republic) is differently oriented: http://crs.bkg.bund.de/crseu/crs/eu-description.php?crs_id=Y1NLX1MtSlRTSyslMkYrS1JPVkFL "The axis X is the image of longitude 42°30' eastwards of Ferro (24°50' E wrt Greenwich) with the positive branch oriented to the south. The axis Y is perpendicular to it and its positive branch is oriented to the west." Maybe others know more here. Cheers Markus _______________________________________________ grass-dev mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-dev