NICTA/nationalmap — pull request #263 by kring (2014-07-29 02:33:58+00:00)
Title: Derive error bounds from the min/max tile heights.

If they're tighter than the tile max geometric error. When zoomed out this makes the error bar a little more sane.

This is Keith's suggestion from #262.

I wonder if it would look better to show a range of heights rather than `random number±big number`...