Web Map Tile Service
| WMTS | |
|---|---|
| Developed by | OGC |
| Type of format | Container format |
| Container for | XML, JPEG, PNG, others |
| Free format? | Yes, with Copyright[1] |
A Web Map Tile Service (WMTS) is a standard protocol for serving pre-rendered georeferenced map tiles over the Internet. The specification was developed and first published by the Open Geospatial Consortium in 2010.[2]
History
The Open Geospatial Consortium (OGC) became involved in developing standards for web mapping after a paper was published in 1997 by Allan Doyle, outlining a "WWW Mapping Framework".[3]. The oldest and most popular standard for web mapping is WMS. However, the properties of this standard proved to be difficult to implement for situations where short response times were important. For most WMS services it is not unusual to require 1 or more CPU seconds to produce a response. For massive parallel use cases, such a CPU-intensive service is not practical. To overcome the CPU intensive on-the-fly rendering problem, application developers started using pre-rendered map tiles. Several open en proprietary schemes were invented to organize and address these map tiles. The first OGC standard for tiled maps is the Tile Map Service. WMTS is a successor the TMS standard and has with more features.
Requests
WMTS specifies a number of request encodings:
- KVP (key-value-pairs) encoding
- REST (Representational state transfer) encoding
- SOAP (SOAP) encoding
The syntax for the WMTS request types is different for each of these encodings. Some request types are:
- Capabilities: returns information about the WMTS service parameters
- Tile: returns a map tile
- FeatureInfo: returns (alphanumeric) information for a given map location
- Legend: returns a legend image for the map
See also
- Open Source Geospatial Foundation (OSGeo)
- Web Coverage Service (WCS)
- Web Feature Service (WFS)
- Tile Map Service, a specification by Open Source Geospatial Foundation (OSGeo) for tiled map layers
References
- ^ "OGC Document Notice". Retrieved 2 February 2011.
- ^ http://portal.opengeospatial.org/files/?artifact_id=35326
- ^ Doyle, Allan (1997). "WWW Mapping Framework". Open GIS Consortium.
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