mples are 
LS. 
organized, 
3. This is 
sification 
aerial 
ographs are 
le of the 
    
photography to the mapping scale. One could use a transfer scope but 
this could be very time-consuming. Therefore, the interpreted data is 
transferred first from the aerial photographs directly to photo mosaics. 
This permits the interpreter to see the distribution patterns of 
surficial material which develop as the work proceeds. The work is 
then transferred to 1:250,000-scale Landsat enlargements by visual 
correlation and minor adjustments are made to fit the level of detail 
of the interpretation to the finer, smaller map scale. The advantages 
of the transfer from airphoto mosaic onto the Landsat enlargements over 
the reduction of the airphoto mosaics are as follows: 
1. The satellite image is tonally controlled and virtually an ortho- 
photo map, whereas the mosaics are photogrammetrically and tonally 
uncontrolled. 
2. Interpreted features are visually distinguishable on Landsat, 
providing better boundary delineation. 
3. The Landsat enlargement covers the same area as the topographic 
map, whereas eight photo mosaics would have to be combined to 
reach this size, entailing considerable edge-fit adjustments. 
4. The scale match between the satellite imagery and the topographic 
maps permits transfer by overlay. 
The author estimates that this method of transfer of data takes one- 
tenth of the time it would take to transfer data from the individual 
photographs by means of a transfer scope, without the use of satellite 
imagery. 
This surficial geology mapping program will be completed within 
three years and the map sheets published as they are prepared. Each 
map sheet will be accompanied by a report describing the surficial 
deposits in greater detail and giving illustrations of the interpreted 
landforms. It is anticipated that publication will be completed by 1981. 
Biophysical Classification of 
the Ontario Portion of the 
Hudson Bay and James Bay Lowlands 
Extending into three Canadian provinces, the Hudson Bay and James 
Bay Lowlands are flatlands extending over 250,000 km?, covered with 
organic deposits and composed of many types of wetlands (Figure 1). 
The program to map the Ontario portion of the Lowlands which will 
be described in this section was initiated in May, 1978 (Boissonneau 
and Pala, in press). However, the methodology was previously tested 
in small wetland reference sites.