[gdal-dev] reprojection from BNG to WGS84 -- using gdalwarp

Andreas Joisten mail at andreas-joisten.de
Mon Mar 22 13:02:58 EDT 2010

Hi all,

I have problem to reproject a raster file in BNG British National Grid to WGS84.

gdalwarp -s_srs EPSG:27700 -tps -t_srs EPSG:4326 -co TFW=YES -r near input.tif geo_output.tif

I have some questions:

Must be the input file a GeoTiff file? 
Which requirements must be met by the input file?
If the input file is a GeoTiff, do I need ground controlpoints?

Thanks for help.

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