New answers tagged utfgrid
I once wrote a UTFgrid function for PostGIS to be used with OSM data. It's not particularly what you're looking for, but it might give you a start. I don't know how it would work with raster though. https://github.com/nationalparkservice/places-api/blob/7f048c2addebd9772e4718a4f0df4e44e981d0a3/scripts/sql_scripts/pgs/func_o2p.sql#L338-407
Sorry, the issue is resolved. It wasn't an issue with TileMill, but the way I was converting MbTile's binary data to ASCII character map is wrong. ASCII only support up to 128 characters thus any binary above 128 got converted incorrectly. I convert the binary data into UTF-8 and it works perfectly.
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