WG: gdalwarp utility

Hello,

I have downloaded the FWtools 2.4.3. And I am using the utility gdalwarp to converter a georeferencied imaged (WGS84) to the Swiss coordinate System, but without sucess:

The Swiss system has as projection = Oblique Mercator, or Bessel ellipsoid 1841. And as datum the CH1903. What I have written  is the code 19841, that coresponds to an Oblique Mercator and datum_code =6149, that correspond to the CH1903 datum according to the files gdal_datum.csv and projop_wparm.csv under the folder FWTOOLS2.4.3/data.

L:\Inventis\User\POD\SRTM_DATA\FWTools2.4.3\bin>gdalwarp -t_srs "+proj=19841 +da

tum=6149" -tr 90 90 L:\Inventis\User\POD\SRTM_DATA\srtm_38_03\srtm_38_03.tif C:\

temp\suiza1.tif

ERROR 1: Translating source or target SRS failed:

+proj=19841 +datum=6149

Could you please tell me what I should write exactly? Or do you have a user manual of the aplication where is explained this.

Yours Sincerely

Diana

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