[GRASS-dev] Re: GRASS 7 status overview

[Michael Barton]

On Feb 14, 2010, at 11:20 AM, Glynn Clements wrote:

> Michael Barton wrote:
> 
>>>> r.external.out and r.colors.out do not generate the GUI when run from
>>>> the command line.
>>> 
>>> Both generate a GUI when run with --ui. r.external.out doesn't have
>>> any required arguments (mainly due to -f), while r.colors.out has a
>>> bug:
>> 
>> It is unclear how r.external.out works. Does it make a GDAL-compatible
>> file appear as a GRASS raster in a mapset? If so, shouldn't this be
>> r.external.in? (i.e., it makes an external raster usable by GRASS)
> 
> r.external.out causes new raster maps to be created as files via GDAL.
> 
> Whereas r.external turns a specific file into a GRASS raster map,
> r.external.out enables a mode whereby all new rasters are created as
> files via GDAL.
> 
> It creates a key-value file named "GDAL" in the mapset directory
> containing various parameters (output directory, file format, creation
> parameters). If this file is present, Rast_open_*_new() and
> Rast_put_*_row() go via GDAL.

So the files can be opened and used subsequently as GRASS files even though they are created in a non-GRASS format (e.g., geotiff)?

Michael