The New York Times has an interesting article that talks about the growing involvement of the public in the development in online maps:

People have been contributing information to digital maps for some time, building displays of crime statistics or apartment rentals. Now they are creating and editing the underlying maps of streets, highways, rivers and coastlines.

“It is a huge shift,” said Michael F. Goodchild, a professor of geography at the University of California, Santa Barbara. “This is putting mapping where it should be, which is the hands of local people who know an area well.”

That is changing the dynamics of an industry that has been dominated by a handful of digital mapping companies like Tele Atlas and Navteq.

Google is increasingly bypassing those traditional map providers. It has relied on volunteers to create digital maps of 140 countries, including India, Pakistan and the Philippines, that are more complete than many maps created professionally.

Not surprisingly for a product that relies on public input about territorial detail, politics can sometimes enter the fray.

Some of the most remarkable efforts of amateur map makers are in countries where few, if any, digital maps existed. Google first tested a tool called Map Maker in India, where people immediately began tracing and labeling roads and buildings on top of satellite images provided by Google.

When Google released the tool more broadly last year, Faraz Ahmad, a 26-year-old programmer from Pakistan who lives in Glasgow, took one look at the map of India and decided he did not want to see his homeland out-mapped by its traditional rival. So he began mapping Pakistan in his free time, using information from friends, family and existing maps. Mr. Ahmad is now the top contributor to Map Maker, logging more than 41,000 changes.

Maps are political, of course, and community-edited maps can set off conflicts. When Mr. Ahmad tried to work on the part of Kashmir that is administered by Pakistan, he found that Map Maker wouldn’t allow it. He said his contributions were finally accepted by the Map Maker team, which is led by engineers based in India, but only after a long e-mail exchange.

At his request, Google is now preventing further changes to the region, after people in India tried to make it part of their country, Mr. Ahmad said. “Whenever you have a Pakistani and an Indian doing something together, there is a political discussion or dispute.”

Google isn’t the only company to rely on the public to collect map data. Sometimes collecting the information can be a social event, and participants feel as though they are contributing to society:

“Seeing an error on a map is the kind of thing that gnaws at me,” he said. “By being able to fix it, I feel like the world is a better place in a very small but measurable way.”

John L. Kittle Jr., a 55-year-old engineer, was one participant. In the past, Mr. Kittle has corrected street names in Atlanta and improved the map for his home town of Decatur, Ga. Recently an acquaintance mentioned that she lived in a new condo development, and Mr. Kittle added it to the map.

Contributors to OpenStreetMap have turned mapmaking into a social activity. Last month, a group of some 200 volunteers in Atlanta braved the wind and drizzle to collect map data across the city. Armed with GPS devices, cameras and paper maps of neighborhoods, they added missing alleys, public art, restaurants and hotels.