Andreas Joisten wrote:
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?
Andreas,
No, gdalwarp will accept any GDAL supported raster format as input
as long as it has georeferencing.
Which requirements must be met by the input file?
It must be georeferenced in some fashion.
If the input file is a GeoTiff, do I need ground controlpoints?
By default gdalwarp will look for an affine transform, but I
see you have selected -tps which requires control points as input.
So yes, with -tps the input file would need to have 3 or more ground
control points.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
_______________________________________________
gdal-dev mailing list
[email protected]
http://lists.osgeo.org/mailman/listinfo/gdal-dev
