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240,000 volunteers create digital map of world

US: Numbers of volunteer cartographers worldwide in OpenStreetMap has reached 240,000. They are trying to create a digital map of every street in every city and village on the planet. It is a kind of grass-roots Wikipedia for maps that is transforming how map data are collected, shared and used — from the desktop to smart phones to car navigation, according to an article published in Los Angeles Times.

The nonprofit community collaboration model behind OpenStreetMap, which shares all the cartographic data in its maps free of charge, is changing the business of mapping, just as Wikipedia changed the business of reference material. More and more, the accuracy of searches on Google Maps or directions issued by your car’s navigational device are based on data collected by volunteer members of OpenStreetMap’s do-it-yourself army.

“A lot of people thought ‘Garbage in, garbage out’ — if you only had the ordinary Joe on the street contributing data, you’d get bad data,” said Steve Coast, who founded OpenStreetMap as a university student in Britain in 2004. Coast also has co-founded a Menlo Park start-up, CloudMade, which produces a variety of for-profit map software products drawn from OpenStreetMap data.

OpenStreetMap uses public mapping data from government agencies and aerial imagery donated by Yahoo and others. Its master Internet map is also based on large amounts of data uploaded by volunteer mapmakers who use GPS units to trace roads, trails and other features. In November 2009, CloudMade released a free Web application called Mapzen that allows people to edit the shape of a building, trace in a pond or label points of interest from benches to bike shops, together with an iPhone application, Mapzen POI Collector, that simply lets users add points of interest.

Google also increasingly relies on feedback from users to make sure its digital maps are accurate and comprehensive, but it does not allow users to directly upload data into its maps, at least not yet. In the next few months, though, Google plans to introduce a product in the US called Map Maker, which gives users much more power to customise maps. And Tele Atlas now allows individual users to suggest map changes directly from their navigation devices.

Citizen mapping is “an evolution of the entire mapping process,” said Richard Taketa, chairman of the geography department at San Jose State. It “is going to be part of the mapping world as we move on to the future.”

Like orienteering or geocaching, mapping can become a kind of outdoor hobby, with a touch of something more.

“There is a very strong community ethic around it,” said Marc Prioleau of Palo Alto, who has mapped mountain bike trails in the Santa Cruz Mountains and ski trails at Squaw Valley in the Sierra Nevada. “In some parts of the country, in some parts of the world, it’s as much a social group as it is a maps group.”

Shawn Britton, a Santa Clara software engineer, has discovered that adding mapping to the Sierra Club hikes he leads attracts more people. On a recent five-mile hike through Uvas Canyon County Park near Morgan Hill, his group carried two GPS units that tracked the exact location of trails.

Hall, who uploaded some of the first US place names into OpenStreetMap from a government database when the community was first branching out from Britain and Europe, has attended a number of mapping parties in the Bay Area. People get together to map an area, then adjourn to a local watering hole to upload data and socialise.

It took about three years for OpenStreetMap to hit 10,000 users, but in the last 12 months, the community has swelled from about 110,000 members to 244,000.

Google has also been surprised by the emotional response people have had to its Map Maker product, which is available in 181 countries from Africa to the Philippines, with some individual users contributing tens of thousands of edits. “Those local users took that to heart as a way to elevate their local community, to sort of put themselves on the map,” said Lior Ron, group product manager for Google Maps. “The concept of what a map is, is changing. With these tools, this is no longer just something that is owned by a government; it’s owned by the community.”

OpenStreetMap users say that because their data are collected by people who actually live in a place, they are more likely to be accurate. “It’s the people’s map,” said Paul Jarrett, director of mapping for CloudMade.

Source: Los Angeles Times