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Abstract
Our efforts to put the possibilities of remote sensing for exploration and
monitoring of the earth’ s surface into practice show that this cannot be
done without the use of complex evaluation methods. In this connection,
the following experience was gained in Niger and Upper Volta:
The main cause for greater expenditures of time and money for interpre-
tation is the use of multispectral sensing methods. This system delivers
information on the state of vegetation which in general was not previously
possible by remote sensing. Conclusions can be drawn from the data on
vegetation about the type of rock and soil, and about nearsurface ground-
water. Thus, an exhaustive interpretation is possible in the fields of geology,
hydrogeology, soil science, and land use only if it is carried out in close
connection with all of thesc disciplines, For a successful interpretation
it is also of decisive importance that several images taken during different
seasons are available for comparison. The time span required for making
the images of important features may take only a few days. Consequently,
it becomes necessary to increase the number of the LANDSAT type satellites
currently in orbit by additional satellites of technically comparable performance.
By use of the multidisciplinary interpretation techniques, large-scale surveys
can be made quickly on geological structures, the distribution of soils and
their suitability for land use, current land use, groundwater potential, and,
under certain conditions, also population distribution. It is possible to
identify land areas that are used too intensively and the resulting damages,
as well as areas whose potential is not being fully used. Repeated mapping
at intervals of several years will allow the monitoring of critical developments
in the desert-near regions of the Sahel Zone.
