NOS Survey L01968 - HYD93 Format Header

  Surv Id Format Ngdc Id   Params Create Date Source Institution Seq
4 L01968 HYD93 03L11106   SF 19791231 National Ocean Survey, N.O.A.A. 01
Country Platform Name Plat Type Chief Hydrographer(s) Seq
U.S.A. Unknown Ship 1SHIP   02
Project Type of Survey Strt Yr End Yr Scale of Survey Seq
    1956 1956   03
Area (General) of Survey Area (Specific) of Survey Seq
LAKE HURON   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 NOS06 North American Datum 1927 07
code Vertical Datum tide Original Sounding Units Seq
  see comments   feet 08
Sounding Method Seq
Digital Echo Sounder w/ Graphical Record assumed 09
c Sound Velocity Correction Seq
1 Corrected for actual sound velocity 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) +43.13 +43.06 -82.50 -82.37 12
Additional Documentation
Seq
VERTICAL DATUM - SOUNDINGS ARE REDUCED TO LOW WATER DATUM WHICH FOR LAKE HURON 13
IS 578.5 FEET ABOVE MEAN TIDE AT NEW YORK, 1935 DATUM. 14
  15
  16
  17
  18
  19
  20
  21
  22
  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