Selkirk Mountains and phototopography, 1906

The topographic map of the Selkirk Mountains in British Columbia was produced using phototopography, which allowed hard-to-reach places to be mapped quickly. The technique was also adapted to oblique aerial photography when it became available in 1925.

Catalogue entry:
Canada. Dept. of the Interior.
Topographical map of part of the Selkirk Range, British Columbia adjacent to the Canadian Pacific Railway / from photographic surveys by Arthur O. Wheeler ; assisted by H.G. Wheeler and M.P. Bridgland, 1901-2. — Scale 1:60 000. — Ottawa : Topographical Surveys Branch, 1906. — 1 map on 3 sheets : col. ; 111 x 177 cm, mounted on linen, sheets 117 x 71 cm or smaller. —

Ref. Nos.: NMC 044265-1, 044265-2, 044265-3