Nikos Alexandris nik at nikosalexandris.net
Fri Nov 14 05:58:30 PST 2014

Nikos Alexandris wrote:

>>>> What is the difference between G_OPT_R_MAP and G_OPT_R_INPUT? 
>>>> Which and
>>>> why should I prefer for my script(s)?
>>>> Is there a step-by-step run-through of all options for composing 
>>>> header
>>>> definitions?

Helmut Kudrnovsky wrote:

>>> see
>>> http://grass.osgeo.org/programming7/gis_8h.html#a5521b5269c52afe64e5051348b08fc69

Benjamin Ducke wrote:

>> But that table doesn't really answer the question,
>> does it? For both "G_OPT_R_INPUT" and "G_OPT_R_MAP"
>> it lists "old input raster map". AFAIU, "G_OPT_R_MAP"
>> is for modules that use only one input raster map.
>> In those cases, the corresponding input option should
>> be named "map=". "G_OPT_R_INPUT" would then be for
>> modules that have either several raster map inputs or
>> raster and vector maps as inputs. The corresponding
>> input options would then be called "raster=" and
>> "vector=" in case of exactly one raster and one vector
>> input map. Further special cases are covered by
>> "G_OPT_R_BASE", "G_OPT_R_ELEV", etc.: They all exist
>> for semantical purposes. All of them stand for raster
>> input maps.

Moritz Lennert wrote:

> I've always understood the difference between MAP and INPUT as
> - MAP: used for modules which treat a map, but do not have
> input+output logic (e.g. r.category, r.colors, etc)
> - INPUT: used for modules that have input + output logic (r.cost,
> r.mfilter, etc)
> The difference between one or multiple inputs is covered by

So, then we have:

G_OPT_R_INPUT -> single raster map for modules featuring output(s)
G_OPT_R_INPUTS -> multiple input raster maps for modules feat. 
G_OPT_R_MAP -> single raster map for modules operating on "this" map
G_OPT_R_MAPS -> multiple raster maps for modules operating on "these" 



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