Difference between revisions of "WMS Tile Caching"
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* World Wind's tiling scheme: [http://www.ceteranet.com/nww-tile-struct.pdf PDF], [http://www.worldwindcentral.com/wiki/Making_Layers wiki] | * World Wind's tiling scheme: [http://www.ceteranet.com/nww-tile-struct.pdf PDF], [http://www.worldwindcentral.com/wiki/Making_Layers wiki] | ||
| − | == | + | == Possible Tile Scheme Parameters == |
* Maximal extent (typically, the entire world) | * Maximal extent (typically, the entire world) | ||
Revision as of 11:10, 29 March 2006
Goal
The goal of a WMS Tile Caching proposal, perhaps WMS-C for short, is to find a way to optimize the generation of map imagery for transmission across the Internet. The proposal needs to offer ideally a single means by which map clients can fetch tiles from existing servers, in such a way that map tiles can be cached on the server, or at an intermediate location, or even be completely pre-generated, if desired. The proposal should leverage the existing investment in OGC-compliant WMS servers on the 'Net.
Proposal
Existing Tiling Schemes
- Mikel Maron's description of OnEarth's LandSat tiling scheme
- World Wind's tiling scheme: PDF, wiki
Possible Tile Scheme Parameters
- Maximal extent (typically, the entire world)
- Projection (typically, EPSG 4326)
- Number of horizontal and vertical tiles at the maximal extent
- Tile size in pixels
- Scale quantization factor (typically, powers of 2)
- Minimum scale (i.e., the number of zoom levels)
Related Projects
- osgPlanet
- NASA WorldWind (wiki)
- Community MapBuilder
- other AJAX map clients, presumably
Interested Parties
- Schuyler Erle
- add yourself