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Title
Remote sensing for resources development and environmental management
Author
Damen, M. C. J.

439
Fig. 5 Farmland 1950 (left) & 1972 (right) ;
one dot = 2 ha.
distribution and their effects can be studied. As
Chisholm (1979) pi40 says "Any technical change
creates conditions of disequilibrium which may
be of long or short duration according as the
innovation in question is or is not major, and
also according to the nature of the adjustment
mechanism". One technical change that certainly
started to occur between the chose dates is the
increase in accessibility of most areas due to
better roads and the introduction of small
vehicles. These show up in the correlation between
the proportion of woodland in a particular area
and its distance from its potential consumers,
mainly in Kaduna. Accessibility correlates in a
strong negative way with the percentage of
woodland in 1972, while in 1950 the relationship
was in the opposite sense.
10.2 Farmland, as would be expected, is more
plentiful near to a road or a railway station,
significantly correlated in 1972, less so in 1950.
Other factors are at work here. As with respect
to Kaduna, the correlation is significantly high
in both years with time. This shows that
topographical and soil factors in the S.E. of the
test area may restrict farming activities.
11. CONCLUSION
Using sample from aerial photographs and dot grids
it is possible to estimate land use changes in
savannah areas with acceptable precision.
Studies of this nature could provide a useful
inexpensive way of obtaining land resources
information in developing countries.