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.