On 14.11.2014 16:22, Moritz Lennert wrote:
On 14/11/14 14:58, Nikos Alexandris wrote:
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
G_OPT_R_INPUT vs G_OPT_R_INPUTS.
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.
output(s)
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"
maps
Right?
At least that is how I've always interpreted it. You'd have to check
individual modules if this is actually how things have been
applied...
Already did. Some counts for the scripts inside
/grass70/dist.x86_64-unknown-linux-gnu/scripts
G_OPT_R_MAP: x5
G_OPT_R_MAPS: x1
G_OPT_R_INPUT: x34
G_OPT_R_INPUTS: x8
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