[GRASS-dev] r.unpack: unhelpful error message when projection info does not match

[Markus Neteler]

On Thu, Oct 10, 2013 at 8:09 AM, Markus Neteler <neteler at osgeo.org> wrote:
> Dear Anna,
>
> thank you, a lot of work for you!

... back to this topic, I would be happy to find a solution for US vs
UK English:

GRASS 7.0.svn (patUTM32):~ > r.unpack x60030_2000.green.histo2000_g.pack
WARNING: Difference between PROJ_INFO file of packed map and of current
         location:
         - name: Universal Transverse Mercator
         ? ^^
         + name: Universe Transverse Mercator
         ? ^
         proj: utm
         datum: wgs84
         ellps: wgs84
         zone: 32
         no_defs: defined
WARNING: Difference between PROJ_UNITS file of packed map and of current
         location:
         - unit: metre
         ? -
         + unit: meter
         ? +
         - units: metres
         ? -
         + units: meters
         ? +
         meters: 1
ERROR: Projection information does not match. Aborting.

r.unpack calls the Python core function compare_key_value_text_files()
http://grass.osgeo.org/programming7/namespacepython_1_1script_1_1core.html#a3ad1670d5f7b4759935d4b38292fa7af
and then does the comparison key by key (so, it fails here).

I think that we need to polish the language differences in r.unpack
prior to the comparison. Maybe via lookup dictionary which can be
expanded in future when more cases come up?

Universe Transverse Mercator --> Universal Transverse Mercator
metre --> meter
metres --> meters
kilometre --> kilometre
kilometres --> kilometres

See also the corresponding C functions:
http://trac.osgeo.org/grass/browser/grass/trunk/lib/gis/proj3.c?rev=58633#L48

The same fix would then be needed in v.unpack.

?
Markus