Use Byte instead of Int16 for overviews #7120
Use Byte instead of Int16 for overviews #7120

That should be enough for overviews and otherwise overview tables can
turn out to be pretty big. Actually running a regression I ran into the
"TIFFAppendToStrip:Maximum TIFF file size exceeded" error described
here: http://www.gdal.org/frmt_gtiff.html

splashblot/dronedb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,splashblot/dronedb,CartoDB/cartodb,CartoDB/cartodb,splashblot/dronedb,splashblot/dronedb,CartoDB/cartodb