333 
statistics, 
examining 
tion plot 
m. Also 
shows that 
r pair of 
hetic data 
3ng set 
.nder the 
\ 
this stage that the results were sufficiently promising to generate 
the map. The classified data was passed to the Electron Beam Recor 
der (EBB) to produce an image (Plate I), and this was then enlarged 
to a more usable size for the field program. 
FIELD CHECKING 
Field checking was carried out in mid-August, 197^, using 
spectral intensity > 
Figure 3. Class separability plot showing: 1) Clear water; 2) Marine 
silts; 3) Silty water; 4) Bedrock; 5) Till; 6) Gravel. 
all-terrain vehicles supported by helicopter. The work consisted 
of checking the accuracy of the unit boundaries and the identificat 
ion of materials on the ERTS map, supported by high altitude air 
photographs and a topographic map to maintain ground control. 
RESULTS 
A map of the Arrowsmith River area was compiled showing 
heck on the actual disposition of surface materials, subdivided into ^eget 
ras noted, ated and non -vegetated areas, and the relative concentrations of 
felt at