Flight height: 7,920 feet a.s.l.; lens focal length: 152.4 mm
Scale: 1:15,000 (approx.)
Date: September 30, 1948
Location: Township 18, Range 21 WI
Map sheets: 1:250,000: 62K Riding Mountain
1:50,000: 62K/9 Elphinstone
Tonal Variations North of Elphinstone
Shown here is an area of lake-strewn ground moraine in the east and the valley of the upper part of the Little Saskatchewan River 1 in the west. The lakes are mainly dark-toned 2 except for those in the southeast 3 where specular reflection is occurring. The large lake in the extreme southeast 4 is ThomasLake; it is large enough that winds blowing across it can produce waves leading to slight tonal variations and a silky texture 5. Note also tonal variations in harvested fields in the north centre: light-toned areas 6 are covered by stubble, whereas irregularly shaped dark-toned areas 7 result from stubble burning, a common practice in southern Manitoba in 1947.