Chapter 2: Location, Borders, and Lakes
The inter-provincial borders and the border with
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).
2.3: Lakes of West Central Manitoba
On this LANDSAT image the radiation recorded from the earth’s surface is processed so that vegetation appears red/brown and water bodies appear as shades of blue.
In the southwest is Riding Mountain National Park 1 with orange/brown patches 2 representing coniferous woodland (radiating infrared radiation at the time of the image). A lighter coloured area in the west 3 is the location of a forest fire that destroyed much of the vegetation. Also seen is the eastern edge of Duck Mountain 4 with some patches of coniferous trees 5. Another area of coniferous woodland (red/orange) can be seen in the northeast 6.
North-northwest/south-southeast lineations in the north 7 are grooves etched by southward moving glaciers. Agricultural land is located east of Duck Mountain 8 and Riding Mountain 9 as well as between the two highlands 10. Northwest/southeast trending lines, particularly noticeable east of
Variation in the shades of blue in the water bodies is an indication of the amount of suspended sediment in the water. Where there is a lot of suspended sediment (usually in shallow lakes) the water is imaged as milky blue, but where there is little (usually in deep lakes) the water appears as dark blue; compare for example Whitewater Lake 12 with Clear Lake 13. Shallow lakes with large suspended sediment concentrations include
Figure 2.3: Lakes of West Central Manitoba
LANDSAT image: May 16, 1973
Bands: 4 0.5-0.6 micrometres (green)
5 0.6-0.7 micrometres (red)
7 0.8-1.1 micrometres (infrared)
Scale: 1:1,000,000 (approx.)