Maps - US

Leonard Patterson took a picture of a parcel of land on Detroit’s northwest side earlier this month as part of an emerging database. Credit Fabrizio Costantini for The New York Times

nytimes.com - by Monica Davey - February 17, 2014

DETROIT — A midnight blue Chevy rolls slowly down a snow-covered street, an emergency strobe light on its roof and a sign on its side that promises this is “official business.” At each house, business, even vacant lot, workers in the car pause to decide whether someone lives there and what shape the place is in before snapping a photo and beaming it to “mission control” miles away.

All over Detroit, scores of these workers — on some days as many as 75 three-person teams — have been wending their way through the streets since December, cataloging on computer tablets one of this bankrupt city’s most devastating ailments: its tens of thousands of abandoned and dilapidated buildings.

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