NOS Survey H06143 - HYD93 Format Header

  Surv Id Format Ngdc Id   Params Create Date Source Institution Seq
4 H06143 HYD93 03031059   S 19791231 National Ocean Survey, N.O.A.A. 01
Country Platform Name Plat Type Chief Hydrographer(s) Seq
U.S.A. Discoverer 1SHIP I.R. RUBOTTOM 02
Project Type of Survey Strt Yr End Yr Scale of Survey Seq
    1936 1936 40,000 03
Area (General) of Survey Area (Specific) of Survey Seq
ALASKA PENINSULA NORTH OF SANAK ISLANDS 04
Quality of Survey Description Processing Status Description Seq
    05
Position Determination Seq
  06
Code Horizontal Datum of Records Code Original Horizontal Datum Seq
NOS31 North American Datum 1983 MGGAL Early Alaska Datums 07
code Vertical Datum tide Original Sounding Units Seq
04 Mean Lower Low Water   fathoms 08
Sounding Method Seq
Lead Line assumed 09
c Sound Velocity Correction Seq
5 Non-acoustic depth measurement 10
Data Processing Methodology Seq
Smooth sheets digitized for N.O.S. under Ashville Contract 11
Format of Data Records Top Lat Bottom Lat Left Lon Right Lon Seq
SURV,LAT,LON,VAL,TYP,CCODE(A8,F9.6,F10.6,F6.1,I1,I3) +54.70 +54.38 -162.83 -162.19 12
Additional Documentation
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Note: You can find the comnplete HYD93 Format Specification, including all code descriptions, at www.ngdc.noaa.gov/mgg/dat/geodas/docs/hyd93.htm