Hi, I am contacting you regarding the calculation of centers of areas in OSM.
Our product, OpenMaps (currently available on the iPhone and the iPod touch), is the only one which lets you tap on POIs on the map. We use the default OSM map as the default map type in our app, but the user can change to OpenCycleMap and OpenPisteMap as well; also the user can add custom map types (e.g. OSM Osmarender). We need to know the exact location of the symbol inside an area (currently we use an algorithm which doesn't always match the rendered symbol's location). The best solution (from our perspective) would be to request the calculated center from OSM, but I'm not sure that it's possible. Otherwise we will implement the algorithm. If I'm not mistaken slightly different algorithms are implemented in different renderers. We are interested in the Mapnik version for now. Point me in the right direction, please; where can I find a description of the algorithm and which source files contain the implementation? Thank you, Csongor Nemes, IZE, Ltd.
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