vans specially equipped with state-of-the-art photo imaging cameras and computer-assisted mass appraisal technology will survey and gather data on the more than 140,000 parcels of real property in the District of Columbia. The vans will photograph each building, confirm the street address, verify property characteristics, and geo-code (GPS) each building’s location.

Baltimore recently made news with reports that the city is using photography in a similar manner to detect roof decks and other housing developments that have property tax implications. I guess in DC too we can expect this system to "more accurately" assess our properties, which no doubt will mean even higher property tax payments.