U.S. Geological Survey Data Series 757
InfoBank is a field data catalog for the U.S. Geological Survey (USGS) Coastal and Marine Geology Program (CMGP) with a structured information storage scheme of databases and software that provide access to USGS CMGP data and metadata, both of which can be accessed at http://walrus.wr.usgs.gov/infobank.
InfoBank uses a unique set of file-naming conventions. Dataset names are the combination of a prefix and a suffix. The prefixes are cruise identifiers and the suffix indicates the data type (Steele and others, 1989). The InfoBank cruise IDs are used to identify and name the MGD77T files presented in this report.
The prefixes are cruise identifiers in one of the following forms: SLYYAA, SLLYYAA.
S = ship code
L (or LL) = leg number
YY = last two digits of the year it was obtained
AA = area code (see below section for descriptions)
Each cruise has a unique combination of ship code, leg number, year, and area code.
|A||Alpha Helix, Auriga|
|G||Growler, Robert Gray|
|L||Samuel Phillips Lee|
|O||Ocean Olympic, Outer Limits|
|P||Parizeau, Point Sur, Polar Sea|
|CP||Central Pacific Ocean|
|EG||Eastern Gulf of Alaska|
|NC||Northern California Region|
|NP||Northern Pacific Region|
|SF||San Francisco Bay|
|SP||Southern Pacific Region|
|SC||Southern California Region|
|WO||Washington / Oregon Region|
The suffix number indicates data type by its first digit:
.0xx = fix navigation; examples: Global Positioning System (GPS), Loran-C
.3xx = bathymetry
.6xx = range navigation; examples: radar, miniranger
The xx is the processing sequence number used internally by the USGS. The first x indicates equipment type and the second x is the processing version number. For more information about these sequence numbers a data dictionary is available on the USGS InfoBank website at http://walrus.wr.usgs.gov/infobank/programs/html/definition/datadictionary.html.