NOS Survey L01167 - HYD93 Format Header

  Surv Id Format Ngdc Id   Params Create Date Source Institution Seq
4 L01167 HYD93 03NG1248   SF 19960807 National Ocean Survey, N.O.A.A. 01
Country Platform Name Plat Type Chief Hydrographer(s) Seq
U.S.A. Unknown Ship 1SHIP S. Moore 02
Project Type of Survey Strt Yr End Yr Scale of Survey Seq
    1908 1910 1:20,000 03
Area (General) of Survey Area (Specific) of Survey Seq
SOUTH END OF LAKE MICHIGAN GARY HARBOR, INDIANA 04
Quality of Survey Description Processing Status Description Seq
    05
Position Determination Seq
  06
Code Horizontal Datum of Records Code Original Horizontal Datum Seq
NOS04 United States Standard Datum 1901 NOS04 United States Standard Datum 1901 07
code Vertical Datum tide Original Sounding Units Seq
26 Low Water Datum 577.5 ft IGLD-1985 L Michigan,Huron   feet 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. by National Geophysical Data Center 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) +41.74 +41.62 -87.34 -87.13 12
Additional Documentation
Seq
Smooth Sheet: "Soundings, in feet, are reduced to Standard Low Water Datum 13
which for Lake Michigan is 578.50 feet above mean tide at New York." 14
  15
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  19
  20
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  23
  24

Note: You can find the comnplete HYD93 Format Specification, including all code descriptions, at www.ngdc.noaa.gov/mgg/dat/geodas/docs/hyd93.htm