- Started after the O'Reilly Where 2.0 conference on June 29-30, 2005
- Motivated by MetaCarta's business needs
- Went through several internal revisions
- Final rewrite took only a month
- Released before Where 2.0 on June 13-14, 2006
Cartography or map making dates back to prehistoric times. Wikipedia provides a history of cartography. Computerized geographic information systems (GIS) were pioneered in the 1960s and 1970s (see Wikipedia on GIS). Soon after the World Wide Web was introduced in the early and mid 1990s, web mapping interfaces started to appear. They typically showed a single map image that was reloaded from a web server after the user clicked to zoom or pan. Panning was implemented either as recentering by clicking on the map image, or by moving one step (half the map size) in one of eight directions (N, NW, W, SW, S, SE, E, NE). Some early names are the Xerox PARC Map Viewer (launched in June 1993, now deactivated), MapBlast (acquired by Microsoft in 2002, closed down and integrated into MSN maps), and MapQuest. The art of adding such pre-2005 web interfaces to pre-web GIS systems using open source software is documented in the book by Tyler Mitchell, Web Mapping Illustrated : Using Open Source GIS Toolkits (O'Reilly, June 2005). Prime names in pre-web open source GIS are MapServer and GDAL/OGR.
Just like many dreams and ideas and less successful approaches predate Wikipedia in creating a free encyclopedia on the Internet, there have also been early attempts in collaborative mapping. So far, none has been more successful than OpenStreetMap, founded by Steve Coast in the summer of 2004. Even though it got a slow start and initially used a simple "pre-2005" web mapping interface, it has proven to scale and improve beyond imagination. Major improvements were made during 2006.
Publisher Tim O'Reilly coined the term "web 2.0" by organizing the "Web 2.0 conference" on October 5-7, 2004. This term attempts to summarize some new developments on the Internet, as it tries to recover from the the dotcom crash a few years earlier. After the advent of Google Maps in February 2005 and the enthusiasm it arose, O'Reilly organized a Where 2.0 conference on June 29-30 the same year.
Beginning of OpenLayers
Apparently, the first Where 2.0 conference inspired MetaCarta to implement an open source software equivalent to Google Maps. A rewrite was made by a group of MetaCarta employees, in the spring of 2006 and OpenLayers was first released before the second Where 2.0 conference, which took place on June 13-14, 2006.
- June 27, 2006: Release 1.0
- August 25, 2006: Release/2.0
- October 2, 2006: Release/2.1
- November 15, 2006: Release/2.2
In November 2006, OpenStreetMap introduced a "slippy map" based on OpenLayers.
In October 2007, the first release of a Slippy Map MediaWiki Extension was announced. Wikis based on the open source software originally developed for Wikipedia can install this extension and give their users access to a <slippymap> tag for the inline display of zoom-and-pan maps.
In 2012, three contributing organizations, Camptocamp, OpenGeo (now Boundless) and terrestris, started raising funds for a complete rewrite of the library. After more than 2 years of development, on Dec 20, 2014, OpenLayers v3.0.0 was released. The OpenLayers 3 API is not backwards compatible with OpenLayers 2, but users that have taken the step to port their applications to OpenLayers 3 have given positive feedback: the library is now leaner, and focuses on its core strengths: a mapping library that supports a wide variety of geospatial data formats. Instead of including its own UI components, like OpenLayers 2 did, the new version makes it easy to integrate with other UI libraries, like React or Bootstrap.
OpenLayers 3 releases are created on a monthly schedule, so it is easy for users to always get the latest and greatest.