According to the information from Topographic Survey and
author's investigations, (Kesik,1975),Canadian Landsat mosaics
have the accuracy relative to the base map 1:1,000.000 aproxi-
mately 1 to 1.5 km, with isolated errors up to 3 km.
Mosaics for Yukon Territory are available at the scale
1:1,000.000 and 1:2,500.000. They are distributed as photo
copies or positive film transparencies.Mosaics at scale 1:1,000.000
have overprinted grid of geographical coordinates.The highest
quality for image interpretation have the positive transparencies.
Spectral informations
The use of band 6 for mosaicing has important consequences.
Near IR band with spectral range 700-800 nm records clearly
differences between water bodies and other surfaces. It also
increases the contrast between illuminated and shaded slopes,
put not to such degree as band 7 used for mosaicing in Alaska.
From the comparison with Alaskan mosaics it could be concluded
that channel 7 increases interpretability of lineaments but also
reduces amount of information related to such elements of relief
like slopes, bottoms of large valleys, coastal plains.
So far as vegetation is concerned, visual, manual interpre-
tation of Landsat mosaics allowed to recognize large areas with
vegegation cover or without it. Bare lands appear in northern
part of Yukon and also as azonal phenomena in mountains. The
differentiation between categories of tundra vegetation and
subboreal forest is beyond the capability of manual interpre-
tation, particularly for Yukon Territory, where variable
physiographical conditions are known to limited degree.
Spectral properties of rocks were not used as the guidelines
for the delineation of lithological or morphostructural units.
The variety of spectral responces is affected by the weathering
conditions, moisture content, soil and vegetation cover.
Fortunately other indicators of the image,like texture and
pattern,which integrate spectral variations, contain great
amount of geological and morphological information useful for
regional analysis.
Concept of geomorphological map; methodological considerations
Compilation of small scale geomorphological map of large
area requires clear methodological procedure. The scale of map
determines the content of information, or level of generaliza-
tion and also the procedure of compilation. In the case of
geomorphological map of Yukon Territory in scale 1:2,500.000
the following steps heve been used for the map compilation.
l.Collection and interpretation of existing data
a.Topographic
b.Geologic
c.Remote Sensing
2.Construction of the map legend: Result of conceptual
work combined with regional distinctions.
3.Regional geomorphological analysis: Analysis of structu-
ral,lithological, climatical and phyto variances as well
as topographical representation of relief. Delineation
of morphological units.Analysis of spatial relations
between morphological units.