[GRASS-user] v.import and v.proj errors

Helmut Kudrnovsky hellik at web.de
Tue Aug 2 09:16:57 PDT 2016

>would be anyway useful to clarify what this "datum_trans" option means.

an example of the datum Hermannskogel [1] aka MGI [2].

this datum goes back to the Austrian-Hungary monarchy which covered the area
of Austria, Hungary, Slovenia, etc.

this datum was used in all these countries, but adapted for several regions
(have look at [3]). 

this means that you can use the MGI datum for Austria, the Balcan countries
etc, but you have to use different +towgs parameters adapted for the
respective regions/countries which is needed for reprojection.

and here the "datum_trans" option is needed to define these different +towgs


[1] https://de.wikipedia.org/wiki/Datum_Austria
[2] https://de.wikipedia.org/wiki/MGI
[3] http://epsg.io/?q=MGI

best regards
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