[GRASS-dev] i.modis key error 'datum'

[Markus Neteler]

On Tue, Sep 25, 2018 at 11:40 AM Nikos Alexandris
<nik at nikosalexandris.net> wrote:
> Nikos Alexandris:
>
> >> Apparently i.modis won't run if the current projection definition does
> >> not have the 'datum' defined. I.e., in a location like,
> >> ```
> >> g.proj -p
> >> -PROJ_INFO-------------------------------------------------
> >> name       : clark66
> >> ellps      : clark66
> >> proj       : ll
> >> no_defs    : defined
> >> -PROJ_UNITS------------------------------------------------
> >> unit       : degree
> >> units      : degrees
> >> meters     : 1.0
> >> ```
>
> Markus Neteler:
>
> >... besides error catching in i.modis, how was that location created?
>
> Actually, using a file from https://zenodo.org/record/1135230:

Yes, that's as explained there:

The Coordinate Reference System (CRS) is identical to the
MOD11C1/MYD11C1 product as provided by NASA. In WKT as reported by
GDAL:

GEOGCS["Unknown datum based upon the Clarke 1866 ellipsoid",
    DATUM["Not specified (based on Clarke 1866 spheroid)",
        SPHEROID["Clarke 1866",6378206.4,294.9786982138982,
            AUTHORITY["EPSG","7008"]]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433]]

Hence, following NASA - MODIS. It seems that a fix in i.modis is needed.

Markus