Standards of open GIS, like openstreetmap, cloudmade?

Question

I am not familiar with the GIS (or map), but recently I have to do some work related to this field. I know some map providers: OpenStreetMap, CloudMadeMap, OpenCycleMap, OpenAerialMap ...

My questions is: Do those map providers have the same standards? I mean the tile size, zoom levels, scales for each zoom level and so on.

Is there any standard for open GIS? If yes, where can I find them or some one could give me some references or links?

Answer 1

Yes, all the services you mention, along with many others in the open-source GIS mapping world, share the same defacto "z/x/y.png tile standard". The tile numbering, zoom levels, scales and so on are all the same across the these providers.

The "standard" isn't official, but the OCG are formalizing the details under the acronym "TMS", unfortunately in an incompatible way with what is in practice (different origin for the tile numbering. Gah!)

The OpenStreetMap wiki has the best description of the numbering scheme. You can display such tiles in OpenLayers using the XYZ or OSM layers. Note that the projection for all these layers is "Spherical Mercator", aka EPSG:900913 or EPSG:3857.

I run the OpenCycleMap servers, and was the Technical Lead for CloudMade when we chose this scheme. Both were chosen to be identical to OpenStreetMap, which in turn was based on the scheme Google were using at the time.

Answer 2

I am also very new to GIS programming, but it seems GIS is heavily standardized. From the storage layer (WKT, WKB), to the server layer (WMS, WFS, SLD..). Try lookinh those up on wikipedia (I think I can't post this many links with my reputation?).

We started developing using the following open source stack: PostGIS, GeoServer, OpenLayers and so far we are happy with our decision, everything fits together beautifully,