I tried georeferencing one of these images ( http://www.oera.net/How2/TextureMaps2.htm ) using MapWindow GIS; the pogram generated a .jgw file, which then I fixed by replacing "," by "." and changing something like 179.12345 to 180.0 . Then I tried again this command: >gdalwarp -s_srs "+proj=merc" -t_srs "+proj=laea" world.jpg dest.jpg
Ok, program now does not complain for any error... but what I get as output is EXACTLY the SAME image!!! What's wrong now? And how do I specify the center of the Lambert projection to be on north pole? *********** BEGIN FORWARDED MESSAGE *********** On 09/02/2009 at 13.47 jumpjack <[email protected]> wrote: From: jumpjack <[email protected]> To: "Wendy Fay Stevenson" <[email protected]> CC: [email protected] Date: Tue, 10 Feb 2009 18:48:45 +0100 Subject: Re[4]: [gdal-dev] gdalwarp: mercator to lambert azimutal equeal area >Thanks, but I can't yet understand... >I have a map of the whole world. It is 640 pixel wide. "Planar world" is >44.000.000 meters wide.... so which number should I specify as "A"?? >The same applies for "E". >About C and F: which coordinates should I specify? Lat and Lon? This >would be 90,-180, I guess, being the map centered on Lat,Lon=0,0 and 360° >wide and 180° tall. > >Thanks for your pacience. > >(Please reply on the list, others could be interested!) > >bye, >Jumpjack > > >*********** REPLY SEPARATOR *********** > >On 09/02/2009 at 13.47 Wendy Fay Stevenson wrote: > >>As long as the world file is the same name as the input file to gdalwarp, >>it will work. >> >>As for specifying the world file: >>A: number of meters across / number of pixels across >>D & B: 0 >>E: -1 * number of meters in length / number of pixels in length >>C and F specify the center of the top left pixel in eastings and >>northings, i.e. where on the projection the first pixel corresponds to. > > *********** END FORWARDED MESSAGE *********** _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
