Mër, 02/15/2012 - 06:56
I think because SQL expression for a center and radius is way simpler than for a rectangular area. I may be wrong I never tested the two for performance but I assumed the center and radius would perform better just because it has 4 comparison operators less than the other.
The other reason is that lets say if there was a regional server for Japan, neither a circle nor a rectangle would be fit if they didn't to serve tiles of other countries. To accommodate that we would have to also add polygons. A SQL expression for searching a point inside a polygon would be a lot more complex and it would probably choke the server.
So I gave up on the idea of supporting rectangles and polygons for now.
I like mod_tile a lot. Especially it's ability to render on the fly. Usage of this mod is upto the volunteer that owns the regional server/s. I would recommend to never expire the planet.
We are going to use the style/z/x/y tree structure where style is something like mapnik, osmarender etc. And we'll use plain file copy from the main tile server down to every regional server.
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