I have built an alternative to GTileLayerOverlay for sparsely
populated tile sets. It does not allocate DOM elements for tiles not
contained in their bounding boxes. It supports multiple overlapping
tile sets in the same overlay without transparent PNG images to fill
the voids. Too many transparent PNG images cause performance to
suffer especially for Internet Explorer which must use
AlphaImageLoader.
The file:
www.polyarc.us/sparsetile.js
is still expermental but feel free to test it knowing it may change.
Feedback will be appreciated.
The file:
www.polyarc.us/sparsetile
demonstrates it in action.
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