Billy, You might consider creating a warped image with a larger pixel size (a multiple of your real target size, say 3000m) to calculate the "correct" extents and then throwing it away.
Etienne On Sat, May 5, 2012 at 6:22 PM, Billy Newman <newman...@gmail.com> wrote: > Still very confused. > > I have a tiff file. I want to get the metadata for that tiff but in > EPSG:4326, without actually warping the image. I can use > CoordinateTransformation to do this, but again it gives me different results > than gdalwarp. > > I will use gdalwarp later (realtime) to serve out an image. But if the > metadata I store (from CoordinateTransformation) is different than the > metadata when I warp I will run into problems. > > gdalwarp gives something like minLon = 30.300001234, but > CoordinateTransformation gives minLon = 30.29988787. I want to gdalwarp > number but without actually warping the entire image. > > I am not sure what .vrt file you are talking about. > > Thanks again > > > On Sat, May 5, 2012 at 3:15 PM, Frank Warmerdam <warmer...@pobox.com> wrote: >> >> On 12-05-05 01:19 PM, Billy Newman wrote: >>> >>> Can you think of a way that I can get the same metadata as gdalwarp would >>> give >>> for a warped image without actually warping the image? >> >> >> Billy, >> >> Just open the .vrt and read the corners (that is compute them from the >> size and geotransform). There will not be any actual warping done just >> to get this metadata from the .vrt but you will get the result >> representative of the reprojected image. >> >> >> Best regards, >> >> -- >> >> ---------------------------------------+-------------------------------------- >> I set the clouds in motion - turn up | Frank Warmerdam, >> warmer...@pobox.com >> light and sound - activate the windows | http://home.gdal.org/warmerda >> and watch the world go round - Rush | Geospatial Software Developer >> > > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev