208 
Band 
Scale 
Date 
Enhancement 
technique 
7 
1:250,000 
19.2.73 
Destriped 
7 
1:250,000 
21.12.75 
High Pass Filter 
4,5,7 
(FCC) 
1:250,000 
19.2.73 
Standard Mixed 
Boxcar 
4,5,7 
(FCC) 
1:250,000 
27-3.73 
Differential Edge 
Enhancement 
Table 2. Enhanced Landsat scenes. 
Black and white aerial photographic cover at 1:60,000 scale was 
obtained locally, comprising 68 stereo pairs. 
Preliminary field reconnaissance surveys were organised. These were 
used to gain a general overview of the regions physiography and resource 
units so as to establish preliminary map legends. 
The Landsat frames were visually examined (using a light table to 
improve contrast) in a conventional manner and tentative interpretation 
for each theme recorded on acetate film overlays. The standard FCC 
formed the basis of these interpretations with other imagery 
supplementing where necessary. Interpretation took 2-5 days depending 
on the theme. 
The aerial photographs were stereoscopically examined, the interpret 
ations being drawn on acetate film fixed to one of each stereopair. 
Interpretation took 15-20 man days for each theme. 
A series of field investigations were conducted to visit photomorphic 
units identified on the imagery. Those areas considered representative 
of mapping units were selected to collect geomorphological, soil and 
vegetation data. Interpretations were verified by visiting 
photomorphically similar areas. 
The identification legends used are as follows: 
Geomorphological/Geological Units 
These were identified and mapped with varying degrees of success. 
A. Solid Geology 
(a) Structure 
(b) Bedrock/alluvium boundaries 
(c) Lithology 
B. Geomorphology 
(a) Features of Geological origin 
(i) Residual hill 
(ii) Cliff 
(iii) Steep bedrock slope 
(iv) Pediment 
(v) Basalt boulder covered slopes