How do I automate the import of raster tiffs into tile mill?
I have well over 100 files.
I have many warped tiff files ready to be imported as individual layers into tile mill so they can be saved out as a single mbtiles file.
If you really need 100 of layers, use
gdal_merge 1.tif 2.tif ... 100.tif -o single.tif to merge them into one.
Alternatively, you may use the fact
project.mml is a plain-text JSON file. Open in in a text editor (notepad will do), find a block corresponding to one of your raster layers, and copy it required number of times, changing tiff file name.