18
January 2015
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
24˝ E. Rikuraru, code RIK, Φ
o
= 10° 01´ 28.34˝ N, Λ
o
= 169°
00´ 47.77˝ E. Rongelap, at Observation Spot, Φ
o
= 11° 08´ 55˝
N, Λ
o
= 166° 53´ 35˝ E. Rongelap (1952), code ROP, at 25.
Astro, Φ
o
= 11° 09´ 02.5˝ N, Λ
o
= 166° 52´ 03.2˝ E, α
o
= 75° 03´
50.1˝ to 24 from south, International, H
o
= 2.5 m. Rongelap
1959, Φ
o
= 11° 26´ 43.62 N, Λ
o
= 167° 03´ 27.56˝ E. Rongerik
(1952), at 1a. Astro station, Φ
o
= 11° 22´ 27.8˝ N, Λ
o
= 167° 30´
59.0˝ E, α
o
= 174° 00´ 56.2˝ to 2a from south, International,
H
o
= 1.9 m. Rube Point, code RUA, at Observation Spot, Φ
o
=
4° 35´ 13˝ N, Λ
o
= 168° 13´ 23˝ E. Takowa Island, code TAA,
at Observation Spot, Φ
o
= 6° 13´ 36˝ N, Λ
o
= 171° 48´ 14˝ E.
UK requested change from Takowaka. Taongi Astro 1952,
code TAO, at 2. Astro, Φ
o
= 14° 37´ 43.5˝ N, Λ
o
= 169° 01´
04.0˝ E, α
o
= 20° 00´ 23.5˝ to 1 from south, International, H
o
= 5.6 ft. Taroa Island Trig Station, Φ
o
= 8° 42´ 44˝ N, Λ
o
=
171° 13´ 48˝ E. Ujelang (1952), at 3. Astro, Φ
o
= 9° 46´ 07.1˝
N, Λ
o
= 160° 59´ 10.2˝ E, International, elevation = 5.2 ft.
Ujelang, at Observation Spot, Φ
o
= 9° 46´ 29˝ N, Λ
o
= 160°
57´ 43˝ E. USAF 1959, at WAKE (8), Φ
o
= 19° 16´ 19.637˝
N, Λ
o
= 166° 39´ 21.745˝ E, α
o
= 273° 29´ 34.503˝ Bikini (4)
to Rolap (2), Hough. Preliminary determination of position
of Initial Point. Utirik (1951), at 2. Astro, Φ
o
= 11° 13´ 08.5˝
N, Λ
o
= 169° 50´ 42.5˝ E, α
o
= 73° 04´ 55.0˝ to 1. from south,
International, H
o
= 5.9 ft. Wotho (1952), at 3. Astro, Φ
o
= 10°
10´ 24.3˝ N, Λ
o
= 166° 00´ 03.3˝ E, α
o
= 306° 04´ 31.2˝ to 1 from
south, International, H
o
= 9.7 ft. Wotje Atoll 1952, code WOJ,
at 2 Astro Point, Φ
o
= 9° 27´ 58.6˝ N, Λ
o
= 170° 14´ 09.7˝ E, α
o
=
320° 12´ 34.7˝ to 42 azimuth mark from south, International,
H
o
= 6.4 ft. Wotje, at Observation Spot, Φ
o
= 9° 27´ 31˝ N, Λ
o
= 170° 14´ 32˝ E. I never was aware of any classified datums
in the area. There could have been but it would have been on
a need-to-know basis. There could well be duplicates in this
list. JWH”
Majuro Atoll has a local grid system based on the
Azimuthal Equidistant projection with origin at station
Dalap where: latitude of origin,
f
o
= 7° 05´ 14.0˝ N, central
meridian, λ
o
= 171° 22´ 34.5˝ E, scale factor at origin, m
o
= 1.0
(by definition),
False Easting = 85 km, and False Northing
= 40 km. Reference ellipsoid is the Clarke 1866.
(Herbert W.
Stoughton, Ph.D, P.E., P.L.S., C.P., FASPRS, 1 April 2008)
According to
TR 8350.2
,
From
Wake-Eniwetok 1960
Datum
To
WGS84, ΔX = +102 m, ± 3 m, ΔY = +52 m, ± 3m,
ΔZ =
–
38 m, ± 3 m; and
From
Wake Island Astro 1952
To
WGS84, ΔX = +276 m, ± 25 m, ΔY =
–
57 m, ± 25 m, ΔZ =
+
149
m, ± 25 m.
The contents of this column reflect the views of the author, who is
responsible for the facts and accuracy of the data presented herein.
The contents do not necessarily reflect the official views or policies of
the American Society for Photogrammetry and Remote Sensing and/
or the Louisiana State University Center for GeoInformatics (C
4
G).
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Grids & Datums
continued from page 14
