[GRASSLIST:6699] Re: Export routine

[Jachym Cepicky]

the best way is r.out.gdal

jachym

On Mon, May 02, 2005 at 12:53:43PM -0400, Nivedita Candade wrote:
> Hello !
> 
> I am having problems exporting a grass raster to ERDAS. I have tried these:
> 
> 1. r.out.erdas: doesn't produce the .img file. Gives me the error "raster
> has no layers" when I try to open it in ERDAS
> 
> 2. I tried directly importing the grass file (w/ respective files in cell,
> cellhd, cats etc. directories) in ERDAS but this method doesn't work. This
> is the error message when trying to import: "The instruction at
> "0x78009047" referenced memory at "0x00000000". The memory could not be
> "read"
> 
> 3. r.out.ascii: created ascii file and tried to "import" ASCII raster in
> ERDAS. This works and creates the img file, HOWEVER, it does not maintain
> classification. I have a classified map w/ 7 classes. Once exported to
> erdas img file, the numbers are treated as DNs and not classes anymore. I
> am unable to assign colors or perform accuracy assessment. I am able to
> open it successfully in ArcGIS but still can't perform accuracy assessment
> in ArcGIS.
> 
> 4. r.out.tiff: works but resulting map is not a classified map anymore. it
> has gray values ranging from 0-255.
> 
> Anyone knows a method to successfully export a classified map from grass
> to erdas ?
> 
> Thanks in advance
> 
> --
> Nivedita V. Candade
> Research Assistant
> Geospatial Analytics Lab
> University of South Florida
> St. Petersburg, FL 33701
> 

-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
URL: http://les-ejk.cz
GPG: http://www.fle.czu.cz/~jachym/gnupg_public_key/