I got this working this morning. Again, I simply need to explore the documentation better! My issue was not with format or projection, but with image size. My final mosaic kept hitting the 3.7GB mark, regardless of whether I used a .vrt, a GTiff, or worked with gdalwarp.
Reading the GTiff driver documentation, I needed to set BigTiff to yes. Thanks all who responded. Using a vrt definitely sped the process as I no longer needed to batch translate from IMG to tif. On Fri, Oct 7, 2011 at 6:59 PM, Chaitanya kumar CH <chaitanya...@gmail.com>wrote: > Jay, > > The gdal_merge script needs the images to match in the coordinate system > and the number of bands. > > One likely problem is could be different data types. Provide the gdalinfo > outputs of the images. > > Before you try that, use the gdalbuildvrt program to create a vrt file and > then gdal_translate to convert the vrt file into a single image. The result > is usually the same. > > > On Fri, Oct 7, 2011 at 9:12 PM, Jay L. <jzl5...@psu.edu> wrote: > >> Sent with an example attachment, which is awaiting approval. Here is the >> mail without attachement. >> >> >> I have 8 large Gtiffs which I am trying to mosaic. Tiffs were created >> from .IMG files downloaded from PDS. I converted to tif using: >> >> gdal_translate -of GTiff -scale -co "TILED=YES" -co >> "COMPRESS=JPEG" <input> >> >> The format conversion is working without a problem. Gdalinfo is reporting >> the correct NDV and projection information. Viewing each tif also returns >> the expected raster iamge. So far, so good. >> >> >> I then use: >> >> gdal_merge.py -o wacmos.tif -of GTiff -v --optfile tiff_list.txt >> >> >> Six of the eight tiles are added to the mosaic correctly. Varying the >> order in the list, or using *.tif does not change the output. It is always >> the same two images which are missing. Watching the verbose output, it >> looks like the images are mosaicing correctly. What would cause these >> images to be merged as totally black tiles? >> >> >> Thanks for any insight, >> Jay >> >> >> >> >> >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/gdal-dev >> > > > > -- > Best regards, > Chaitanya kumar CH. > > +91-9494447584 > 17.2416N 80.1426E >
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