Photogrammetric and Glaciological Studies of Salmon Glacier

Résumé

Reports results of work as geodesist-glaciologist on Univ. of Toronto-National Research Council of Canada Second Salmon Glacier Expedition, 1957, to this glacier on the Alaska-British Columbia border. A dense and accurate ground control network was established to ensure accuracy for photogrammetric processing of photographs. Surveying and mapping was done by aerial photogrammetry; the methods, and such for supplementary terrestrial photogrammetry are described. General physical setting is outlined. Recession of the Salmon and associated glaciers is described, for the period 1949-1957, and tentative data for 1920-1957 recession are tabulated. Compilation of a map at scale 1:25,000 provided an accurate basis for glaciological investigations. A second mapping in 1962, with relative flying elevations not to exceed 2,500 m is recommended.