A question about ReDem and partial tiles.

[fecrails]

I have two BIL files that join across the middle of a row of tiles. If I don't allow partial tile generation in ReDem I end up with an empty row of tiles. With allowing partial tile generation I can get either the north half of this row of tiles to render or the south half to render depending on which BIL file I use for tile generation. Is there a way to join the two BIL files to avoid this gap? I use QGIS to process the 15'x15', 1/9 arcs downloads from USGS using Hacks instructions.

Update: 11:34 PM
Problem Solved!

I spent quite awhile tinkering with QGIS today and figured out how to merge .img files into a single .bil file to use in ReDem.

1. Start QGIS and select Raster > Miscellaneous > Merge
2. The Merge window will open
3. Check the "Choose input directory instead of files" box.
4. Select the folder where the .img files you want to merge are located for the input files.
5. Select the output file and from the file type drop down menu be sure to select .bil file type and name the output file.
6. Click OK to merge the files.

Then follow Hack's instructions to extract projection to generate the missing .blw file
located here: http://www.3dtrains.com/forums/index.ph ... ap-viewer/