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In the latter case use was made of the photography discussed with reference 
to derelict land surveys while sites were mapped at scales of 1:10000 and 
and 1:10560 (part of a map is shown in Figure 4). Certain data were marked 
on the maps indicating the geology and area of the site, whether it was 
disused or active, wet or dry and the number of access points to it. 
More detailed information was given on an accompanying schedule which 
additionally indicated for each site a geocode, the surrounding land use 
and whether tipping was already taking place. 
The survey resulted in a series of maps and schedules which indicated 
potential tipping sites i.e. sites which on the basis of air photo evidence 
might prove of value for tipping purposes. Such sites could be graded 
and those having greatest potential could be checked out in the field and 
supplemented by data from other sources (e.g. depth of watertable below 
site, owner or tenant of site). In addition contoured photogrammetric 
plots could be made of sites in order to assess the amount of waste which 
a site could take. Thus the careful combination of photo interpretation, 
photogrammetry and field survey has usefully aided the solution of one 
of the developed world's more serious problems. 
Tropical environment studies and Third World development 
Although most research in the Remote Sensing Unit has dealt with problems 
of environmental planning and resource management in the United Kingdom, 
attention has been paid to similar problems in the Third World, particularly 
in Jamaica, 
In 1971 an ambitious remote sensing mission by NASA undertaken as part 
of the Earth Observation Aircraft Program largely failed to produce the 
results anticipated. In consequence a project was initiated whereby 
several sets of aerial photography were examined in their ability to ful- 
fill the requirements of the United Nations Development Program/Govern- 
ment of Jamaica Forestry Development and Watershed Management Project, 
for preparing a watershed survey and development plan for an area of approxi- 
mately 20,000 acres in extent. Black and white and colour infrared 
photography, both at scales of 1:50000 and 1:12500 were interpreted for 
land use and soil erosion. These features were mapped and their areas 
measured. The results obtained were compared and conclusions drawn as to 
whether colour infrared photography gives superior results to black and 
white, whether the additional cost of the colour emulsion can be justified 
and whether the larger scale of photography is necessary at the initial 
planning stage. Recommendations have been made for the future use of 
the NASA photography and for the planning of similar projects in the future, 
Soil erosion hazards in Jamaica, are being studied in more detail in a 
current project which is examining black and white photography at scales 
of 1:25000 (taken in 1961 and 1968) and 1:10000 (1973), This multi- 
temporal study is comparing changes in land use with variations in soil 
erision in the Northern half of St Catherine's parish, Jamaica on the 
premise that gullying (the best indicator of erosion) increases with the 
intensity and type of land use. For example peasant cultivation should 
be associated with different rates of erosion to those found within plant- 
ations since the land management is quite different, As yet, it is too 
early to determine the exact erosion/land use relationships which occur, 
but the final results of the project should contribute usefully to land 
management problems in the island.