Difference between revisions of "WMS Tile Caching"

Revision as of 10:10, 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

Tiling 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

@@ Line 9: / Line 9: @@
 * Mikel Maron's description of [http://lists.eogeo.org/pipermail/tiling/2006-March/000017.html OnEarth's LandSat tiling scheme]
 * World Wind's tiling scheme: [http://www.ceteranet.com/nww-tile-struct.pdf PDF], [http://www.worldwindcentral.com/wiki/Making_Layers wiki]
+== Tiling 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 ==