[GRASS-user] Multiple, adjacent raster maps was (Re: Resample DEM to larger cells)

Rich Shepard rshepard at appl-ecosys.com
Tue Oct 1 15:06:10 PDT 2019

On Tue, 1 Oct 2019, Rich Shepard wrote:

> However, I have a question (for anyone to answer) about working with this
> basin topography.
> There are 70 individual raster maps within the mask of the basin's watershed
> boundary. Am I correct that speed-issues aside, I need to run r.buildvrt so
> I have a single map as input to modules such as r.info (to identify the
> highest elevation), r.slope, and others? While I understand that a mask
> limits analyses to its area that is based on a single map extending beyond
> the mask and not a collection of 70 'tiles'. Am I correct?

No, I'm not correct. I had thought r.patch only filled holes in one raster
map with values from a second raster map. Re-reading the manual page I
learned that when there are no holes it will glue adjacent maps together to
form one large one.



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