After fighting #GDAL, #RasterIO, and a million other tools for a couple evenings, I finally have a pipeline that can create unified Slippy #map tiles from a mix of #GeoTIFFs and other tiles, all across multiple projections!

It feels like a huge win on the way to a scalable raster pipeline.

I'm sure this is child's play for experienced raster data wranglers, but it feels so good for my first major success!