A PHP Error was encountered

Severity: Warning

Message: getimagesize(/srv/www/vhosts/mbair/images/figures/no_image.jpg): failed to open stream: No such file or directory

Filename: controllers/figure.php

Line Number: 40

Manitoba from the Air
Image Options
Show Trace
1968 Photo

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 Assiniboine River, which carries more suspended sediment than the Little Saskatchewan River, is lighter toned than the latter. Also some deciduous trees, probably aspen (Populus tremuloides) appear light toned 6 because in this fall photo the leaves have changed colour to bright yellow.

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 Assiniboine River, tree shadows indicate that the trees have lost their leaves so that their branched form can be seen 12.

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-Canada Highway 14, 15, and 16. Given their location it can be assumed that they are trucks or cars; the largest of the four is a truck 16.

Figure 1.1.b

1968 Photo