616 
C D 
p hotographs: Selected photomorohic features presented on colour IR air photographs. Original scale 1*26,000 
A. Linear features representing oaleocoastal environment of proglacial lake* beaches, sand bars, spits, 
troughs 
B. Convoluted features representing ice-collapse, glacio-lacustrine sediments. 
C. Elongated to irregularly shaped oaleo-dunes 
D. Contemporary floodplain of the Thames River. 
4.2 Digital Analysis 
Airborne multispectral scanner data (MEIS-II) have 
been subjected to image analysis procedures using a 
Dipix, (Aries-II) System. Data processing and 
enhancement operations included optimal band 
selection, contrast stretches, spatial filtering 
and principal component transformation, prior to 
visual interpretation. 
5 RESULTS 
5.1 Black & white panchromatic air photographs 
Panchromatic, B&W air photographs, taken in late 
summer provide limited information for surficial 
geological mapping due to the masking effect of 
vegetation and subdued relief. Only broad delinea 
tion of physiographic units likely to reflect 
geological units are possible. 
5.2 Colour 
The colour 
conditions 
emergence 
better exp 
The six ma 
clearly de 
include; (P 
a. Linea 
landforms 
ment of pr 
spits, tro 
b. Convo 
glacio-laci 
c. Elong; 
d. Contei 
e. Moraii 
f. Hummoi 
5.3 Digita: 
a. Selectic 
The select: 
using a rai 
(1985). T1 
nm), CHOO 
Imagery fr< 
enhancement 
visual inti 
b. Contrast 
Histogram-« 
the best r« 
of colour c 
triplet. 
c. Spatial 
Best result 
The enhance 
accentuatir 
glaciolacus 
naleo-dunes 
d. Principa 
A principal 
Waltz, 1979 
material ar 
optimal thr 
e. Band rat 
After elimi 
bands, the 
CH05) were 
images. Be 
surficial m 
features we 
CH05 (blue) 
Enhanced di 
equalisatio 
to better i 
photomorohi 
been oartic 
mation deri 
The incre 
does not al’ 
nition of s 
conditions 
humus conte 
plowing, ca 
after enhan 
nhotomorphi