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Datum
Datum
History Of North American Datums
1.
Brief History of
North American Horizontal Datums New England Datum of 1879 United States Standard Datum of 1901 North American Datum of 1913 North American Datum of 1927 North American Datum of 1983
2.
3.
Fire Island Triangulation
Network – Long Island, New York – Point Judith, Rhode Island. 1851
4.
U.S. Coast Survey
- Chart of Boston Harbor – 1857 – Based on early New England Datum.
5.
6.
7.
Transcontinental Arc of
Triangulation - 1899
8.
9.
10.
Ellipsoid – Geoid
surfaces in comparison with local topography
11.
12.
13.
Relative Datums
14.
15.
16.
Geodetic Latitude &
Longitude
17.
18.
19.
20.
21.
Preparing a station
for observations – North Dakota - 1913
22.
Triangulation setup –
Kaibab Plateau, Arizona - 1914
23.
Triangulation crew, Idaho-Montana
- 1922
24.
Backsighting with a
Heliotrope – Snake River, Idaho - 1922
25.
Measuring a baseline
with an Invar tape, Southeastern Oregon - 1916
26.
Measuring a baseline
with a microwave distance meter – Cook Inlet, Alaska - 1970
27.
NAD-27 Triangulation Network
in The U.S. as of 1931
28.
29.
30.
31.
WGS-84 ellipsoidal parameters
32.
NAD-27 relative to
NAD-83
33.
There are differences
in the two datums ranging from ~100m in the western U.S., to ~1m – 3m in the central and eastern U.S. as show below.
34.
35.
36.
Datum Transformation Algorithm
37.
38.
39.
40.
41.
NGS - Data
Sheets KG0640 *********************************************************************** KG0640 FBN - This is a Federal Base Network Control Station. KG0640 DESIGNATION - MEADES RANCH RESET KG0640 PID - KG0640 KG0640 STATE/COUNTY- KS/OSBORNE KG0640 USGS QUAD - MEADES RANCH (1978) KG0640 KG0640 *CURRENT SURVEY CONTROL KG0640 ___________________________________________________________________ KG0640* NAD 83(1997)- 39 13 26.71169(N) 098 32 31.74579(W) ADJUSTED KG0640* NAVD 88 - 600.3 (meters) 1969. (feet) GPS OBS KG0640 ___________________________________________________________________ KG0640 X - -734,972.577 (meters) COMP KG0640 Y - -4,893,188.523 (meters) COMP KG0640 Z - 4,011,982.818 (meters) COMP KG0640 LAPLACE CORR- -2.96 (seconds) DEFLEC99 KG0640 ELLIP HEIGHT- 573.99 (meters) (08/12/03) GPS OBS KG0640 GEOID HEIGHT- -26.35 (meters) GEOID03 KG0640 KG0640 HORZ ORDER - B KG0640 ELLP ORDER - FOURTH CLASS I
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