Re: Contours
Markus Neteler <[email protected]>
| Newsgroups | gmane.comp.gis.grass.user |
|---|---|
| Message-ID | <CALFmHhvHYPTDYrWYTaZVtYOZrpbwEzy9-oZhcwu9A9KSWACkxw@mail.gmail.com> |
On Mon, Dec 18, 2017 at 6:38 PM, Rich Shepard <[email protected]> wrote: > On Mon, 18 Dec 2017, Shane Carey wrote: > >> I have a large DTM (5m cell size) and it covers an area of 100,000km2. I >> need to create contours every 10meters in the dataset. If I tile the >> dataset and contour each tile, the data, the contours act funny at the >> edges, hence the need to process the area as one area. Is grass capable of >> doing this? > > > Shane, > > Yes. As long as you have sufficient memory and drive space. You can always > set the environment variable in ~/.bash_profile: > > export=GRASS_VECTOR_LOWMEM=1 > > which will use available memory and not crash, while running more slowly. > > If I'm wrong I'm sure we'll both read about it. :-) Shane: please report how it goes. Markus PS: If you want a tiled approach (could probably be partially run in parallel), then you may create tiles with overlaps, then generate the contour lines: https://grass.osgeo.org/grass72/manuals/r.tile.html _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user