[Tilecache] Some definitions

[Andrea Zilio]

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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