Jökull - 01.12.1973, Blaðsíða 77

each station represents the root mean square
(RMS) propagated error for the station value,
holding fixed the gravity value for Reykjavík
A. The results of the adjustment are shown in
Table 4.
TABLE 4 - TAFLA 4
Analysis of errors in base station network
Greining á mceliskekkjum i grunnneti
Number of stations ................ 46
Number of loops ................... 58
Number of observations...... 444
RMS error of a single
observation ............... ± 0.018 mgal
Mean standard propagated
error ........................ ±0.011 mgal
Maximum standard propagated
error ........................ ± 0.016 mgal
RESULTS
The results of the gravity survey are given
ln Appendix I and Appendix II. Appendix I
gives the principal facts of the gravity base
stations including station bench mark number,
station name, geographical coordinates, eleva-
tIon> observed gravity after adjustment, and
propagated error interval. Appendix II gives
descriptions and photographs of the base stations
together with other pertinent information. Sta-
tion Reykjavík M, located at Keflavík Airport,
has become obsolete, and is omitted.
ACKNOWLEDGEMENTS
The gravity base station network described
here forms a part of a regional gravity survey
of Iceland which is carried out by the National
Energy Authority, Reykjavík. The field work
and initial processing of the data was sponsored
by the U. S. Artny Topographic Command
under Contract No. DACA71-68-C-Ol 11.
The assistance of Mr. Kristinn Thorbergsson
and Mr. Asmundur Jakobsson of the NEA in
carrying out the field measurements is grate-
fully acknowledged.
REFEREN CES
Einarsson, T. 1954: A survey of gravity in Ice-
land. Soc. Scientiarum Islandica, Publ. 30.
22 pp.
Saxov, S., and R. Spellauge. 1967: Gravity ties
Denmark—the Faroes—Iceland. Boll. Geo-
fis. Teor. Applicata, 9, 66—84.
Sömod, Th. 1957: Gravimetric ties. Geodetic
publication No. 10. Geographical Survey of
Norway, Oslo.
Torge, W. 1971: Determination of the calibra-
tion factors of LaCoste-Romberg gravity
meters and time variations in the calibra-
tion. Boll. Geofis. Teor. Applicata, 13,
298-305.
Whalen, C. T. 1966: The Euro-African second-
ary calibration line survey: U. S. Air Force,
138lst Geodetic Survey Squadron, Wyom-
ing.
Ziegler, R. E. 1969: Draft instructions for com-
puter program GRASS. Army Topographic
Command, Washington, D. C.
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