MapCache

Author:Thomas Bonfort Contact:tbonfort at terriscope.fr

MapCache is a server that implements tile caching to speed up access to WMS layers. The primary objectives are to be fast and easily deployable, while offering the essential features (and more!) expected from a tile caching solution.

• Compilation & Installation
• Configuration File
• Supported Tile Services
• Seeder
• Cache Types
• Image Formats
• Tileset Dimensions
• FeatureInfo Requests
• Proxying Unsupported Requests
• Data Sources
• Tile Assembling

See also

MapCache presentation slides at FOSS4G2011

Features

• services WMS, WMTS, TMS, VirtualEarth/Bing and Googlemaps requests: Supported Tile Services
• ability to respond to untiled WMS requests by merging tiles from the cache or forwarding them to the wms source: Tile Assembling
• responds to WMS/WMTS GetFeatureInfo requests (forwarded to source service)
• KML superoverlay generation
• data provided by WMS backends (GDAL supported sources planned)
• cache types:
  • Disk
  • BerkeleyDB
  • Sqlite
  • Memcached
  • Tiled TIFFs
• configurable metatiling
• on-the-fly tile merging for combining multiple tiles into a single image
• image post-processing (recompression and quantization) when arriving from a backend
• interprets and produces cache control headers: Last-Modified, If-Modified-Since, Expires
• multithreaded seeding utility, that can seed specific zoom levels or specific areas ( e.g.: seed levels 0 to 12 of all tiles intersecting Colorado )
• ability to add a custom watermark on stored tiles
• produces a CGI/fastCGI executable for using with other webservers than apache
• configurable symbolic linking of blank tiles to gain disk storage
• configurable error reporting: plain http error code, textual message, or empty (blank) image
• ability to specify vendor params or dimensions to be forwarded to the WMS backend (and build a cache that takes these parameters into account): Tileset Dimensions