A layered overlay provides a separate tile layer, with the image overlaid on these tiles.
In order to locate the image on the underlying map you have to provide a couple of anchors, specifying the world location of two or more image points.
Once specified you can then use the tile set produced by Cilogi Overlay as a layer on top of a third party tile set. We only provide a limited cover in the area around the image. Requests for tiles outside this area return an HTTP 404 return code. This should not be a problem. If performance is an issue, which it can be for mobile, then you may be better off using fully baked tiles. For more information see here
Our tiles are not always as memory-efficient as they should be, due to limitations of the App Engine platform whihc doesn't support 8-bit PNG images.
© Copyright Cilogi 2012. All rights reserved.