mapbox/mapnik-omnivore — pull request #23 by yhahn (2014-08-07 17:22:10+00:00)
Title: Minzoom for gdal sources

@GretaCB stopgap solution for now -- this uses `maxzoom-6` (bottoming out at z0) for gdal sources.

I gave this a little thought and I think this may actually be a reasonable approach in the future as well.