In other words, When I ask GDAL for: *gdalwarp -s_srs EPSG:23030 -t_srs EPSG:4258 rast_23030.tif rast_4258.tif*
GDAL knows that 'EPSG:23030' means '+proj=utm +zone=30 +ellps=intl +units=m +no_defs'. So my question is: From witch file GDAL gets that information from? Cheers, Eloi Ribeiro GIS Analyst 39,45º -4,40º http://eloiribeiro.wordpress.com On Mon, Oct 11, 2010 at 14:55, Eloi Ribeiro <eloi.ribe...@gmail.com> wrote: > Hi all, > > I would like that every time a I use gdalwarp for some EPSG codes [1] > transformation it would use by default the nadgrids [2] (for Portugal and > Spain) that I have under the folder '/usr/share/proj/'. > > For that purpose in PostGIS I needed to add > '+nadgrids=nadgrid_file_name.gsb' at the end of the line of the 'proj4text' > field text in table 'spatial_ref_sys' for each EPSG code I wonted to use the > nadgrid. > > So I suppose there must be a similar way of doing this with GDAL. How can I > achieve this with GDAL? > > Thank's! > > [1] 27492,27493,20790,20791,23029,23030,23031,3763,4258,4326 > [2] pt73_e89.gsb, ptLX_e89.gsb, ptLB_e89.gsb, ptED_e89.gsb, R2009V9.gsb, > BALR2009.gsb > > > Eloi Ribeiro > GIS Analyst > 39,45º -4,40º > http://eloiribeiro.wordpress.com >
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