[GRASS-user] DAtum Warning while using r.in.gdal

[Kim Besson]

Thanks to Paul and Micha for the help.
About this: I defined my location using this image but instead of being
reprojected with PROJ4 extension I used EPSG:3763 and then r.in.gdal. Then,
using the same original image (in UTM) I reprojected to this CRS but using
PROj4 extension (showed in my original message).

What is the correct one? the bellow expression or the EPSG:3763 in order to
reproject an image?

It was only a warning. It imported the image nevertheless, without using -o
option.

2010/5/31 Micha Silver <micha at arava.co.il>

>  On 05/31/2010 07:25 PM, Kim Besson wrote:
>
> Greetings
>
>  Following a few suggestions made at this list I'm using gdalwarp to
> project a few landsat images and only then yusing r.in.gdal.
>
>  I'm using this expression to reproject image:
>  gdalwarp -t_srs "+proj=tmerc +lat_0=39.66825833333333
> +lon_0=-8.133108333333334 +k=1 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +no_defs
> " L71203033_03320001023_B10.TIF  landsat_out.tif
>
>  And when I run r.in.gdal I get this warning:
>  Datum <unknown> not recognised by GRASS and no parameters found
> Projection of input dataset and current location appear to match
>
>  What does this means?
>
>   There's no +datum=  parameter in the CRS definition, so the new,
> projected tif has no datum information. But, if you're sure the above
> parameters are correct, you can ignore the warning and tell GRASS to ignore
> the warning with the "-o" option to r.in.gdal.
> BTW, how did you define the GRASS Location? with the EPSG:3763 or the above
> definition? If so, then you surely should have no problem importing with the
> -o (over-ride projection check) option.
>
>   Thanks
> kim
>
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> --
> Micha Silver
> Arava Development Co. +972-52-3665918
> http://www.surfaces.co.il
>
>
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