(v) an investigation into the occurrence of fires in relation to the 
distribution of vegetation; 
(vi) the delineation of potential forest conservation areas, and 
(vii) the delineation of palaeo—drainage systems in the western part 
of South Africa. 
A drawback of the ERTS 1 imagery is its relatively poor resolution of 
approximately 80m. For this reason the use of ERTS images is prin— 
cipally in defining regional, as opposed to detailed, relationships. 
. Research & Development 
Research continues on the potential uses of multi—spectral imagery in 
certain specific applications, but much more basic data is still required to 
permit both visual and computerized analogue matching of local ground 
emission spectra with the image characteristics, so that spectral bands can 
be selected with confidence to meet specific needs. 
Progress has recently been made in the application of Airborne infra—red 
Scanning Radiometer images in geology. 
. Special References 
Malan, O.G. : The ERTS programme and its achievements. 
The S.A. Jnl. of Photogrammetry, Vol. 6, No. 1, 
1974. 
Partridge, T.C. : The Witwatersrand — a study in metropolitan 
research and analysis undertaken for Metrocom 
to assist the Central Guideplan Committees for 
the East & West Rand: Special Report: Terrain 
and Engineering Geological Constraints. Urban 
& Regional Research Unit, University of the 
Witwatersrand, 1974. 
Pretorius, J.P.G. and Partridge, T.C. : The analysis of angular stypicality of 
lineaments as an aid to mineral exploration. 
Jnl. of the S.A. Inst. of Mining & Metallurgy, 
Vol. 74, No. 10, 1974. 
Viljoen, R.P., and M.J., Grootenboer, J. and Longshaw, T.G. : ERTS—1 
imagery: An appraisal of applications in geology 
and mineral exploration. Minerals, Science & 
Engineering, Vol. 7, 1975. 
Proceedings : Third Symposium on Terrain Evaluation — S.A. 
Inst. of Civil Engineers, Feb. 1975.