mapbox/millstone — Issue #20: millstone needs to throw if a projection is not known for layer types where it will not be autodetected
Author: springmeyer
Created: 2011-10-17 22:53:55+00:00
State: open

You can easily get blank maps for layer types in tilemill other than geojson and shapefiles, because projections that are unknown are simply passed through as blanks. So, then mapnik aborts rendering and dumps: `proj_init_error:failed to initialize projection with: ''` in the logs.

Millstone should throw and let the api user (in this case tilemill) about the need to manually specify the projection.