Web Map Tile Service

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The standard Web Map Tile Service (WMTS) is a geospatial service , specified by the Open Geospatial Consortium (OGC) and defined as a web service to offer and access digital maps on a tile basis. Version 1.0.0 of the standard was adopted by the OGC on April 6, 2010. It was developed as its own standard, but has many conceptual similarities with existing OGC standards such as B. the WMS standard .

target

The aim of the WMTS standard is to provide high-performance cards for applications. To this end, the card is the server side pre-generated and in smaller individual cards, even tiles (Engl. Tiles ) called cut and stored ( Tile cache ). These tiles can then be called up individually by the application.

The WMTS standard serves as an interface for standardized access to tiled maps. In addition to the WMTS standard, there are other solutions for accessing tile-based maps. These include B. the Web Map Service Caching (WMS-C) and the Tile Map Service, a standard of OSGeo .

technical description

The main task of a WMTS service is to provide and deliver existing cards in the form of tiles. Requests to the WMTS server can be made via HTTP POST and HTTP GET. In this case, the parameters and their values ​​are transferred as key-value pairs (KVP). As an alternative, the standard provides requests via SOAP . The WMTS service has different methods:

GetCapabilities
Allows general information about the WMTS service to be obtained. In response, the system delivers an XML document with information, for example on the supported coordinate systems and available data.
GetTile
Individual tiles can be requested via the methods. In response, the system returns the corresponding image in the requested format.
GetFeatureInfo
A WMTS can answer inquiries about a position in the map section shown. As an output, it provides specified thematic information on the underlying data.

Applications

The WMTS standard is supported by several server systems, including the open source projects MapProxy , GeoWebCache and mod-geocache. On the application side, the WMTS standard can currently be integrated into the web application OpenLayers and Leaflet and the desktop GI systems QGIS , Global Mapper and Gaja.

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