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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