Extension of
framework by the
Colonial Survey Section.
Discrepancies in
the trigonometrical lists.
30
trigonometrical values of all the P.W.D. points
in Hong Kong and the Leased Territories with a
triangulation diagram was obtained by the G.O.C.
Hong Kong and forwarded to the War Office with an
intimation that these were the best available data
for the production of a map, and that
triangulation errors varied between 2" and 9".
These lists were merely coordinate lists in
geographicals and rectangulars with no information
as to the data on which they were based.
On the arrival of the Survey Section it
was found that the P.W.D. were too much occupied
with other work to be able to give any assistance
in checking or extending the triangulation, but
that they had marked some of the trigonometrical
points in the field. It was also found that the
triangulation points observed by King in the area
of the 8" map had been lost and this triangulation
was consequently of no value.
The Officer in charge of the Colonial
Survey Section made efforts to get further
information about the trigonometrical framework
from the Survey Office but was told that no more
information was available.
The Colonial Survey Section extended the
P.W.D. triangulation to cover the whole Colony but
their work was only of the order of accuracy
required for the control of a topographical map on
a scale of 1/20,000, and the points were only
temporarily marked on the ground. It was
arranged with the P.W.D. that they would
subsequently erect permanent marks.
On the return of the Colonial Survey
Section to England the compilation from the air
photographs
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