[R-sig-Geo] rgdal and grass rasters

[Jonathan Greenberg]

As far as sample code goes, simply getting
grass_to_raster=raster("somegrassfile") is my goal -- my understanding
is anything rgdal can read, raster can read.  Running your command I
do get:

GRASS (ro): GRASS Database Rasters (5.7+)

But with rgdal:

require(rgdal)
gdaldrivers=getGDALDriverNames()
gdaldrivers$create[gdaldrivers$name=="GRASS"]
[1] FALSE
gdaldrivers$copy[gdaldrivers$name=="GRASS"]
[1] FALSE
gdaldrivers$create[gdaldrivers$name=="GTiff"]
[1] TRUE
gdaldrivers$copy[gdaldrivers$name=="GTiff"]
[1] TRUE

Am I perhaps missing an rgdal installation flag that is required to
enable GRASS rasters?

--j

On Mon, Mar 1, 2010 at 6:04 PM, Dylan Beaudette
<dylan.beaudette at gmail.com> wrote:
> Roger can likely point out the problem after some example code is
> posted. In the mean time I would suggest checking to make sure your
> GDAL is compiled _without_ GRASS support, and that the GDAL GRASS
> plugin is correctly installed.
>
> This is how I check on my machine:
>
> gdal_translate --formats | grep -i grass
>  GRASS (ro): GRASS Database Rasters (5.7+)
>
> Cheers,
> Dylan
>
> On Mon, Mar 1, 2010 at 5:44 PM, Alex Mandel <tech_dev at wildintellect.com> wrote:
>> spgrass6 is a an R package and has read/write access to GRASS datasets.
>> It's usage would be instead of rgdal(well sorta, rgdal is required by
>> spgrass6). Both write objects to sp types.
>> You can use it from within R to start a GRASS session or within GRASS to
>> start a linked R session.
>> http://cran.r-project.org/web/packages/spgrass6/index.html
>>
>> I got GDALinfo to work on my machine, I wonder if your just missing the
>> gdal-grass library, or libgrass.
>>
>> On ubuntu it's something like libgdal1-1.6.0-grass
>> I know qgis needs this to work with GRASS not sure about gdal itself but
>> based on http://gdal.org/frmt_grass.html probably. Also note that page
>> talks about the path to a dataset that should be used.
>>
>>
>> Thanks,
>> Alex
>>
>>> Hmm, I'm trying to use the raster package via rgdal to access these
>>> files -- I'm trying to avoid having to export then to another format
>>> (I'm dealing with gigabytes of rasters), although I suppose I could do
>>> this.  Does spgrass6 "enable" rgdal to access GRASS rasters, or is it
>>> its own standalone program?  How does the base gdal package work with
>>> grass rasters?
>>>
>>> --j
>>>
>>> On Mon, Mar 1, 2010 at 2:35 PM, Sarah Goslee <sarah.goslee at gmail.com> wrote:
>>>> I think you need to export it from grass first, with r.out.gdal
>>>>
>>>> Or you can use spgrass6 to work with R and GRASS directly.
>>>>
>>>> Sarah
>>>>
>>>> On Mon, Mar 1, 2010 at 5:17 PM, Jonathan Greenberg
>>>> <greenberg at ucdavis.edu> wrote:
>>>>> Folks: when trying to import or GDALinfo a grass raster, where,
>>>>> exactly, should I be pointing to in the grass directory?  I tried
>>>>> pointing to the file with the same name as the raster I want to work
>>>>> with in the fcell, cellhd, and cell directories
>>>>> (grass/location/mapset), but none of these are working...  thanks!
>>>>>
>>>>
>>>>
>>>> --
>>>> Sarah Goslee
>>>> http://www.functionaldiversity.org
>>>>
>>>
>>> _______________________________________________
>>> R-sig-Geo mailing list
>>> R-sig-Geo at stat.math.ethz.ch
>>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at stat.math.ethz.ch
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>