Vertical air photo: A20811-97
Flight height: 7,200 feet a.s.l.; lens focal length: 152.07 mm.
Scale: 1:12,000 (approx.)
Date: September 29, 1968
Location: Township 10, Range 20 WI
Map sheets: 1:250,000 62F Virden
1:50,000 62F/16 Alexander
Twenty years after photo 1.1a was taken, the Little Saskatchewan River 1 takes a more direct route to the Assiniboine River 2 (the 1948 route is indicated by a dashed line) and has deposited sediment 3 in the larger river.
This photograph also illustrates several of the criteria used in air-photo interpretation.
1) Tone. Tones are in shades of grey, ranging from almost white, to almost black. Fields on which crops have been grown, and at least partly harvested, appear in light tones 4 whereas the relatively clear water of the Little Saskatchewan River is dark toned 5. The
2) Texture. A field east of the Little Saskatchewan River 7, which has been left fallow, exhibits a smooth texture because of its uniform medium grey tone. On the other hand the treed area south of the Assiniboine River 8 has a mottled texture resulting from the various tones of the constituent trees.
3) Pattern. East of the fallow field are two other fields exhibiting the characteristic pattern of grain crops that have been harvested. The westernmost 9 has a pattern of narrow lines typical of a field that has been swathed whereas the field to its east 10 has wider rows resulting from the fact that it is being combined.
4) Shape/shadow. Shadows thrown by trees west of the Little Saskatchewan River are rounded 11, indicating that they are deciduous rather than coniferous. South of the
5) Location and size. At the north end of the field being combined are eight vehicles 13. Given their location it is a reasonable assumption that they are combine harvesters accompanied by trucks to receive the grain. At least four vehicles can be seen on the Trans-