CO129-505-13 Survey of Hong Kong 22-6-1927 - 13-12-1927 — Page 28

E.

The Colonial Survey Committee.

Notes on the Survey of Hong Kong.

#5

12

Inadequacy of the topographical maps.

Shortage of Trigonometrical

data.

In 1919, G.O.C., Hong Kong drew

attention to the inadequacy of the mapping of Hong

Kong and the Leased Territories. The maps were

on varying scales andof different orders of

accuracy. The only map which was at that time

considered to be sufficiently accurate for military

purposes was the 8" to the mile survey which

covered only a part of the Leased Territories.

The War Office at that time was unable

to send out a party to survey on the ground but

was prepared to grid the existing maps and to incorporate any corrections which were sent home

from Hong Kong. In the course of an investigation

regarding the fitting of a grid on to the ", 24"

and 8" to the mile maps, it was found to be

impossible to grid them accurately using the

trigonometrical points supplied.

Further information regarding these

points and the projection used for the maps was

asked for from the G.O.C., Hong Kong. On 29th

July, 1922, G.O.C.,Hong Kong reported that every

effort to obtain positions of further

trigonometrical points and information about the projection of the 8" to the mile map had been made

but without result.

The 8", 2", " to a mile maps were

gridded during 1923 at the War Office but, owing to

inaccuracies in the maps and the impossibility of

obtaining