Open Knowledge Foundation Definition
Open data is data that can be freely used, reused and redistributed by anyone – subject only, at most, to the requirement to attribute and sharealike.
Use in the government/public sector (from Socrata)
Making data that belongs to the public broadly accessible and usable by humans and machines, free of any constraints.
Data from government satellites and ground stations.
Created industry for:
Global Positioning System (GPS)
US Gov. released GPS data once reserved for military use to the public.
Gave rise to GPS-powered innovations:
Important point: not personally identifiable data
Issues in the past: Journal News, Westchester County, NY, published map with names and addresses of people who had gun permits
White House executive order - http://project-open-data.github.io/