investigations. Thermal infrared imagery is amenable to this
type of analysis, for like reasons.
Considering FIGURE 3 again, the letter "C" points to a slope
which meets several parameters for susceptibility to landsliding.
The slope is steep, the bank is high and sand overlies clay.
There is no vegetation on the top of the bank or on the slope,
to lessen infiltration of the earth mass by water. In fact,
water may be seen at the foot of the slope, and moist earth at
the top. As a final note, other landslides have occurred here in
the near vicinity.
SUMMARY
Remote sensing is an ideal tool for the analysis of indivi
dual landslides, the inventory of landslides over a large area,
and the determination of qualitative susceptibility of a slope
to movement. With sufficient knowledge of the nature of landslid
ing in the Leda clays of eastern Ontario, it has been possible
to prepare an inventory for this region, of landslide features.
The utility of this inventory is for regional planning, so as to
keep high population densities, and major traffic routes away
from areas of high landslide incidence. Also, the danger of
severe vegetation changes re - activating landslide - prone
slopes may be recognized.
Parameters for slope instability are observable via remote
sensing, thus it is practical to regularly examine regions of
multiple landslide occurrence.
BIBLIOGRAPHY
Chapman,L.J., Putnam,D.F.
1966: The physiography of southern Ontario, 2d ed.,
University of Toronto Press.
Gagnon,H.
1972: La photo aerienne dans les etudes de glissement de
terrain, Rev. Geogr. Montr., Vol. XXVI
Alfôldi,T.T.
1974: A regional study of landsliding in eastern Ontario
by remote sensing, M.Eng. thesis, University of
Toronto.
Geological aspects of eastern Canadian flow slides,
proc. 10th Can. Soil Mech. Conf., N.R.C.
Gadd,N.R.