Dark Bilious Vapors

Hacking Google Maps to add value to Google's mapping software:

Tracking sexual predators in Florida. Guiding travelers to the cheapest gas nationwide. Pinpointing $1,500 studio apartments for rent in Manhattan.

Geeks, tinkerers and innovators are crashing the Google party, having discovered how to tinker with the search engine's mapping service to graphically illustrate vital information that might otherwise be ignored, overlooked or not perceived as clearly.

"It's such a beautiful way to look at what could be a dense amount of information," said Tara Calishain, editor of Research Buzz and co-author of "Google Hacks," a book that offers tips on how to get the most out of the Web's most popular search engine.

Yahoo and other sites also offer maps, but Google's four-month-old mapping service is more easily accessible and manipulated by outsiders, the tinkerers say.

As it turns out, Google charts each point on its maps by latitude and longitude - that's how Google can produce driving directions to practically anywhere in the nation. Seasoned developers have figured out how to match these points with locations from outside databases that can contain vast amounts of information - anything from police blotters to real estate listings.

Thanks to Adrian Holovaty, 24, who overlayed Chicago Police Department crime statistics on a Google map, house-hunters in the Albany Park neighborhood can pinpoint all the sexual assaults in the district between May 19 and April 19 on a single map. With each crime marked by a virtual pushpin, Chicagoans can quickly learn what dangerous train stations, pool rooms and alleys to avoid.

Holovaty hopes to make the maps more current by persuading Chicago police to provide the data directly, rather than forcing him to glean it from the department's Web site. Police seem amenable - he's got a meeting with them next week. But community activist James Cappleman is already impressed with Holovaty's Chicagocrime.org - no longer do citizens have to trust politicians crowing about safer streets.

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Visitors to Floridasexualpredators.com, which combines Google Maps with data on convicted sex offenders, can call up maps of their communities and click on the pushpins to see the name, last known address and mug shot of each offender.

Drivers searching for their area's cheapest gas can go to www.ahding.com/cheapgas, which blends Google Maps with data from Gasbuddy.com's database of prices at individual gas stations.

Home buyers can pinpoint the locations of houses in their price range at Cytadia.com. And renters can turn to Housingmaps.com, which melds the technologies of Craigslist and Google, to spot available housing in 29 cities including San Francisco, New York, Los Angeles and Chicago.

All these sites are operating without Google's permission, clearly violating the company's user agreement. But none charges any fees, and Mountain View-based Google, which declined to comment through a spokesman, has made no effort to shut them down.

"Why would they?" asks Kenneth Tan, who works for a Chicago-based media research firm and is relying on Housingmaps.com to find a new place in New York. "This is fantastic publicity for the company."

Len on 06.09.05 @ 07:06 PM CST