Manitoba’s location in Canada is best shown on high level satellite images with some cartographic enhancement to show the position of its borders (Figure 2.1). In the case of Figure 2.1, a satellite 900 km above the earth’s surface obtained the individual images used in its construction. Manitoba has borders with the United States to the south; Saskatchewan to the west; Ontario to the east; and Nunavut to the north. These have been added to the image and are not, of course, represented by any physical barrier on the ground. Differences of land use on either side of the international border may make it recognizable even on small-scale satellite images (Figure2.5) as well as on larger scale air photographs (Figures 2.6 and 2.7). However, the border is not always marked by land use differences (Figure 2.8), and in some cases, although there is a clear tonal difference from one side to the other, it is not obvious what this represents on the ground (Figure 2.9).
The inter-provincial borders and the border with Nunavut cannot be distinguished on the basis of land use differences because none exist. In wooded areas (Figure 2.10) the border is often represented by a cut line, but in agricultural areas (Figure 2.11) the border is merely an abstract line symbolically represented on maps.
A high proportion of Manitoba’s total area (15.6 percent) is water including some very large lakes, for example, Lake Winnipeg, Lake Winnipegosis, Lake Manitoba, and Cedar Lake These and many smaller lakes can be identified on satellite images (Figure 2.2, and 2.3). Not only their location can be seen but also information can be obtained about their depth and sediment content (Figure 2.3).
Land south of the border shows as a darker tone, but what does this represent? There must have been some variation in land use north and south of the border when the photos were taken. More light-toned fields 1—probably harvested cereal crops—can be seen in Canada and more east/west field shelterbelts of trees 2 can be seen in the U.S.A., but neither fact fully explains the tonal difference. This is a very flat region, part of the area covered by Lake Agassiz in immediate post-glacial times. Poorly developed strandlines can be seen in the south 3.
Vertical air photograph: A21821-65
Flight height: 24,000 feet a.s.l.; lens focal length, 85.55 mm
Date: August 10, 1970
Scale 1: 84,500 (approx.)
Location: Township 1 and 2, Ranges 2, 3 and 4WI in Canada
Map sheets 1:250,000 62H Winnipeg
1:50,000 62H/4 Altona