> > I think the silence is an indication that there is no way to ask > MapServer to produce an exception in this case at the moment. > > I'd suggest you file a ticket proposing that as an enhancement. > > Daniel > -- > Daniel Morissette > http://www.mapgears.com/ >
Given that mapserver can't do this at the moment have you considered other options? While it probably not as efficient you might be able to set up a cron to watch your cache for new images and do a "gdalinfo -mm" on each new tile in the cache and delete tiles with only one value (ie blank tiles).
