The SVG WG is working on SVG2, and does not seem to be actively considering this module. This was proposed in June 2011 to tackle the Level of Detail problem when using SVG pictures on mobile devices. W3C Tiling and Layering Module for SVG1.2 Tiny Google Maps and the Google Maps API uses these conventions: Images served through a REST API, with URL like Z is the zoom level, and X, Y identify the tile.The Web Mercator projection is used, with latitude limits of around 85 degrees.This means that about 22 zoom levels are sufficient for most practical purposes. Each zoom level doubles in both dimensions, so a single tile is replaced by 4 tiles when zooming in.At the outer most zoom level, 0, the entire world can be rendered in a single map tile.OpenStreetMap provides Slippy Map Tilenames, or XYZ, interface based on the Leaflet javascript library, which is an off-shoot of OpenLayers, and use these conventions: See OpenGIS Web Map Tile Service Implementation StandardĪn early version was Tile_Map_Service developed by the Open Source Geospatial Foundation, supported by the OpenLayers JavaScript library.
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