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U.S. Geological Survey Data Series 757

Appendix 1

InfoBank File Naming Conventions

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

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.

Cruise Identifier

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.

Ship Codes Used Within these Datasets

Code Ship
A Alpha Helix, Auriga
C Carmel
D Discoverer
F Farnella
G Growler, Robert Gray
J David Johnston
K Karluk, Kila
L Samuel Phillips Lee
M McArthur
O Ocean Olympic, Outer Limits
P Parizeau, Point Sur, Polar Sea
S Sea Sounder
T Tamnik

Geographical Area Codes for these Datasets

Code Area
AR Arctic Ocean
BS Bering Sea
CP Central Pacific Ocean
EG Eastern Gulf of Alaska
GB Glacier Bay
HB Humboldt Bay
HW Hawaii
MB Monterey Bay
NC Northern California Region
NP Northern Pacific Region
SF San Francisco Bay
SP Southern Pacific Region
SC Southern California Region
WO Washington / Oregon Region
YB Yakutat Bay

Data Type Numbering of Data Files from InfoBank

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

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