mod-geocache

Development of mod-geocache has moved to the mapserver project under the name "MapCache"

The current site is left online for history purposes only, all ongoing development is on the mapserver infrastructure.

mod-geocache is an open source apache module written in C with a permissive license that aims to implement a subset of the features offered by existing tile caching solutions. The primary objectives are to be fast and easily deployable, while offering the essential features expected from a tile caching solution.

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demo

the demo site has a list of configured services that can be output by mod-geocache

features

services WMS, WMTS, TMS, VirtualEarth/Bing and Gmaps requests
ability to respond to untiled WMS requests by merging tiles from the cache or forwarding them to the wms source
responds to WMS/WMTS GetFeatureInfo requests (forwarded to source service)
KML superoverlay generation
data provided by WMS backends (GDAL supported sources planned)
experimental memcached cache
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
ability to add a custom watermark on stored tiles
can produce a 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)

see the commented configuration file and documentation for the full features.

what's still missing

ability to invalidate a tile, a set of tiles, a level or an area from the cache
ability to report errors inside an image (think EXCEPTIONS=application/vnd.ogc.se_inimage in wms)
misc: planned features.

This list is not set in stone, so feel free to add an enhancement request.

Contributions in terms of code or funding are welcome.

changelog

getting and installing the software

tarballs can be downloaded from the "downloads" tab (last release: 0.4 from 2011/05/18).

mod-geocache is still under active development. For the latest updates, you must checkout the code from the project's subversion repository.