[Tilecache] Some definitions

Andrea Zilio andrea.zilio at gmail.com
Mon May 18 14:38:29 EDT 2009


Hi all,

I'm pretty new to OpenLayers and, generally, to the "maps world"...

I'm trying to use OpenLayers not to show any map but an enormous image (made
of a lot of other images) and let users move and zoom around it.

Server side we're using tilecache with a GDAL layer and a tiled TIFF (as
suggested here to a friend of mine:
http://openlayers.org/pipermail/tilecache/2009-May/001832.html).

In the service we're developing we will use javascript to move the
openlayers view to a specific area of the enormous image (so centering it on
a specific pixel) also with a specific zoom.
So we need to translate pixel coordinates and zoom of the enormous image to
latitude/longitude coordinates and openlayers zoom levels/resolutions.

To do so I think I should better understand the various terminology such as
"bounding box","resolution","extent", "projection" etc...

So... Where can I find a good definitions and explanations for these terms?

Thanks in advance
Andrea Zilio
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