On 10-02-17 17:15, Markus Metz wrote:
On Tue, Feb 7, 2017 at 3:43 PM, Markus Neteler <nete...@osgeo.org
<mailto:nete...@osgeo.org>> wrote:
>
> On Tue, Feb 7, 2017 at 3:32 PM, Markus Metz
> <markus.metz.gisw...@gmail.com
<mailto:markus.metz.gisw...@gmail.com>> wrote:
> [...]
> > Unfortunately it changes East from 179.9998611 to 179.9998597 and
north
> > from 83.9998611 to 83.9998604.
> >
> > The more serious problem is that GRASS can not handle ll
coordinates like
> > 180:0:0.50W or 90:0:0.5S.
> >
> > I have relaxed the ll restrictions in my local copy and can now import
> > CHELSA and other for GRASS problematic ll datasets without getting
e.g. a
> > narrow N-S strip, or GRASS fixing a subtle rounding error that in
fact is
> > not an error. That means after each import I have to manually check if
> > resolution and extents make sense, and if in doubt fix them with
r.region.
>
> That's probably rather more a power user task than common user
> knowledge...
Why a power user task? r.region is an easy to use module, as long as
you know the correct grid geometry. And with my relaxed ll
restrictions I get less errors and more usable results, in fact I need
to use r.region less often than before.
Not sure that is what Markus meant, but "relaxed the restriction in my
local copy" sounds definitely like a power user task to me. If this is
something that can, and will, be done at the libgis level, great.
Otherwise, I would be interested to know how to do this.
> Is there anything we could do at libgis level like
> relaxing the ll restrictions along with appropriate user messages?
Yes. The first points would be ll_scan.c, ll_format.c and
adj_cellhd.c. That should also remove cryptic errors like "ERROR:
Syntax error in cell header".
> More and more global datasets are getting published, so the issue will
> likely come up more frequently. Just to make it a bit easier :-)
For a start, it would be nice if you can create a full SRTM mosaik
(not so new data) in GRASS.
Markus M
>
> markusN
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