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Figure 1. Description of and Relationships between Levels 
of GCRP Data Usage. 
Universe of Data Sets 
Data sets outside of GCRP domain. Not yet 
investigated for use by GCRP personnel. 
GCRP Investigated Level 
Existing data sets investigated by GCRP 
personnel but not yet used or referenced 
in GCRP projects. 
GCRP Accessed Level 
Data sets accessed, used, and/or referenced 
by GCRP personnel but not stored permanently 
in the GCRP information system. 
GCRP Acquired and Generated Levels 
Data sets acquired by GCRP and maintained 
permanently in the GCRP information system. 
GCRP generated data sets designed and 
populated with GCRP data and stored in 
the GCRP information system.