[GRASS-user] r.in.gdal for importing categorical ArcGIS binary rasters

Moritz Lennert mlennert at club.worldonline.be
Fri Feb 21 08:26:36 PST 2014

On 21/02/14 17:12, Markus Metz wrote:
> On Fri, Feb 21, 2014 at 2:00 PM, Moritz Lennert
> <mlennert at club.worldonline.be> wrote:
>> On 21/02/14 11:30, Markus Metz wrote:
>>> On Fri, Feb 21, 2014 at 9:35 AM, Moritz Lennert
>>> <mlennert at club.worldonline.be> wrote:
>>>> On 20/02/14 22:14, Markus Metz wrote:
>>>>> I would not replace a working gdal version with a probably not working
>>>>> gdal version. Your gdalinfo reported a raster attribute table, not
>>>>> mine. You could double-check again if your gdalinfo still finds a
>>>>> raster attribute table, then import with r.in.gdal.
>>>> Out of curiosity: if a table contains several columns which one(s) is/are
>>>> imported and in what form do they appear in GRASS (I don't have a file
>>>> here
>>>> to test myself) ?
>>> Each column has a dedicated usage. For "name" usage, the column is
>>> treated as category labels. For any of the color usages, the column is
>>> treated as corresponding red, green, or blue color. See also the gdal
>>> documentation [0]. Currently, r.out.gdal exports category labels or
>>> color rules to a raster attribute table with the new -t flag, and
>>> r.in.gdal automatically imports any information it finds.
>>> Markus M
>>> [0] http://www.gdal.org/gdal_8h.html#a27bf786b965d5227da1acc2a4cab69a1
>> So, IIUC you get the GFU_Name and the color information, but if the table
>> contains several fields (which I guess will be of type GFU_Generic) these
>> are ignored ?
> GFU_Generic usage is ignored because it is unknown what this could be good for.

VAT tables allow as many fields as the user wants, not only a class 
name. But I don't know (and can't tell from ESRI's documentation) 
whether these additional fields will all be considered GFU_Names or 
GFU_Generics) and as I don't have relevant data here (and data that 
colleagues created for me causes an error with gdal...) I can't test 
this at this stage.

My question was: if a raster has several fields as in the attribute 
table, would it be possible to chose the field to use as labels in GRASS ?


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