Jökull - 01.12.1981, Side 118

A TOPOGRAPHICAL MAP OF
HVERADALUR, KVERKFJÖLL,
ICELAND
J.P.C. Bailey, R.C. Bailey,
A.W. Billinghurst, J. R. Bridges,
N.P. Maxwell, D.G. Powell
and/l.y. Wright,
Cambridge, England
Survey Techmques
Hveradalur was mapped to a scale of 1:2000
by plane table and telescopic alidade. The
spot heights marked on the map were
calculated by triangulation using readings
obtained from the telescopic alidade and were
measured relative to a temporary bench mark.
The extreme limits of error incurred are ±
5.0 m.
Zero and 20 m contour lines were
established for that part of Hveradalur which
lies immediately to the N. E. of the lake with a
Zeiss X 18 automatic builder’s level and a
Vicker’s quickset level and staff. This method
was also used to find the lake level relative to
the temporary bench mark.
The errors incurred were not greater than ±
0.5 m.
116
JÖKULL 31. ÁR