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An expert system shell for inferring vegetation characteristicsThe NASA VEGetation Workbench (VEG) is a knowledge based system that infers vegetation characteristics from reflectance data. VEG is described in detail in several references. The first generation version of VEG was extended. In the first year of this contract, an interface to a file of unknown cover type data was constructed. An interface that allowed the results of VEG to be written to a file was also implemented. A learning system that learned class descriptions from a data base of historical cover type data and then used the learned class descriptions to classify an unknown sample was built. This system had an interface that integrated it into the rest of VEG. The VEG subgoal PROPORTION.GROUND.COVER was completed and a number of additional techniques that inferred the proportion ground cover of a sample were implemented. This work was previously described. The work carried out in the second year of the contract is described. The historical cover type database was removed from VEG and stored as a series of flat files that are external to VEG. An interface to the files was provided. The framework and interface for two new VEG subgoals that estimate the atmospheric effect on reflectance data were built. A new interface that allows the scientist to add techniques to VEG without assistance from the developer was designed and implemented. A prototype Help System that allows the user to get more information about each screen in the VEG interface was also added to VEG.
Document ID
19940015811
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Harrison, P. Ann (JJM Systems, Inc. Arlington, VA, United States)
Harrison, Patrick R. (JJM Systems, Inc. Arlington, VA, United States)
Date Acquired
September 6, 2013
Publication Date
November 1, 1993
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
C931033-U-2R00
NASA-CR-189318
NAS 1.26:189318
Accession Number
94N20284
Funding Number(s)
PROJECT: RTOP 462-61-14
CONTRACT_GRANT: NAS5-30127
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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