[gdal-dev] Re: gdal_merge.py - Missing images

[Jeff Ruby]

You might try building a vrt file first and then converting that.

gdalbuildvrt merge.vrt *.tif

 -or just merge the original IMGs-

gdalbuildvrt merge.vrt *.img

-then-

gdal_translate <your options> merge.vrt output.tif


> Message: 4
> Date: Fri, 7 Oct 2011 11:42:52 -0400
> From: "Jay L." <jzl5325 at psu.edu>
> Subject: [gdal-dev] Fwd: gdal_merge.py - Missing images - sans
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>
> 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