135 
the value, 
stock for 
themselves, as do the standard deviations. For regional applica 
tion the method would be very useful. However, for application 
to individual farms, the deviation values indicate that some 
improvements are necessary before the Key itself could be effect 
ively used. 
in 1972 
method 
lected 
From the first application and consequent preliminary 
results the premises concerning the usefulness of new concepts 
do seem to hold. Much more detail about agriculture has been 
obtained from aerial photographs than previously seemed possible. 
Min. Max 
ACKNOWLEDGEMENTS 
The encouragement and financial assistance of the author's 
Ph.D. Supervisor, Dr. Dieter Steiner, University of 
Waterloo is gratefully acknowledged. All special 
computer programs were written by Jonne L. Ryerson. 
-35 +65 
REFERENCES 
-35 +47 
Dominion Bureau of Statistics 
-27 +73 
1972: Livestock and Product Statistics 1971 
Catologue #23-203, Ottawa, Government 
of Canada. 
-27 +27 
-35 +48 
Ontario Ministry of Agriculture and Food 
Various Years: Publication 20: Agricultural Statistics 
Toronto, Canada for Ontario. 
num 
Ontario Ministry of Agriculture and Food 
1971: Ontario Farm Record Book Toronto, Canada 
thout 
effect 
Ontario Ministry of Agriculture and Food 
1971: Farm Business Management Toronto, Canada. 
pt those 
sture), 
ategory 
type. 
Ryerson, R.A. and H.A. Wood, 
1971: Air Photo Analysis of Beef and Dairy Farming, 
Photogram Engineering 37 (2) 157-69. 
Stone, K.H. 
1964: "A Guide to the Interpretation and Analysis of 
Aerial Photos" Annals Association of American 
Geographers (54) 318-26 
ig 
a time 
iuction 
Ly identi- 
a yields, 
am under 
for 
Vink, A.P.A. 
1964: Some Thoughts on Photo Interpretation 
ITC Publications, Series B No. 25, Delft, 
The Netherlands.