| Surv Id | Format | Ngdc Id | Params | Create Date | Source Institution | Seq | ||
| 4 | L01434 | HYD93 | 03991065 | SF | 20000301 | National Ocean Survey, N.O.A.A. | 01 |
| Country | Platform Name | Plat Type | Chief Hydrographer(s) | Seq |
| U.S.A. | Unknown Ship | 1SHIP | Sherman Moore | 02 |
| Project | Type of Survey | Strt Yr | End Yr | Scale of Survey | Seq |
| 1923 | 1923 | 20,000 | 03 |
| Area (General) of Survey | Area (Specific) of Survey | Seq |
| NORTH END OF LAKE MICHIGAN | West of Squaw and Trout 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 |
| NOS04 | Standard American Datum (add doc) | NOS04 | Standard American Datum (add doc) | 07 |
| code | Vertical Datum | tide | Original Sounding Units | Seq |
| Great Lake Datum, differs lake to lake | 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) | +45.89 | +45.76 | -85.82 | -85.56 | 12 |
Additional Documentation |
Seq |
| The Standard American Datum used by Army Corps of Eng. may be misnamed. | 13 |
| The most likely datum used was U.S Standard Datum 1901 (Clarke Ellipsoid 1866) | 14 |
| ref: NOAA Professional Paper NOS2: North American Datum of 1983 | 15 |
| 16 | |
| Datum as recorded on the original smooth sheet listed as: | 17 |
| North American Standard Datum, with coordinates of the adjustments of 1919. | 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