The passage of California forestry bill AB452 created a need to assess and analyze multiresource forest data on a statewide basis. The California Department of Forestry (CDF), in responding to part of this need, formed a cooperative effort with Ames Research Center (ARC) and the Jet Propulsion Laboratory (JPL) to prepare a land-cover map of the entire state, emphasizing forest types. This map was produced in less than 1 year, as required, by combining the latest techniques in digital image mosaicking at JPL with the high-speed processing capability available on the ILLIAC IV parallel processor and other computer systems at ARC. An operational and very responsive analysis method was developed at ARC that permitted on-time response to weekly workshops conducted with CDF field personnel to identify all 1,200 spectral classes and to produce final products. Over 100,000,000 acres were classified in the period between December 1, 1978, and April 15, 1979. All analyses were conducted using existing software.

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