Non existant mask tiles should default to transparent about ga-worldwind-suite HOT 1 OPEN

The issue with assuming that tiles with non-existant masks should be transparent is that, when a tileset doesn't have a mask tileset at all, or when the tileset contains an alpha channel already, it would be treated as transparent because the image tile doesn't have an associated mask tile.

Generally the image tileset will be generated at the same time as the mask tileset, in which case the number of image tiles should exactly match the number of mask tiles. If both the image and mask tilesets are generated with the Tiler's "Ignore blank tiles" option enabled, blank tiles will be ignored for both tilesets.

Probably a better option would be to write a script that deletes any tiles which don't have an associated mask file (this script already exists in our internal SVN: see Software/Java/WorldWind/Misc/DataPrepScripts/src/main/java/au/gov/ga/worldwind/dataprep/NoMaskDeleter.java).

from ga-worldwind-suite.