-— 2143. - 
APPLICATION OF LANDSAT MOSAICS FOR THE COMPILATION 
OF SMALL SCALE GEOMORPHOLOGIC MAP OF YUKON TERRITORY 
A.B.KESIK 
DEPARTMENT OF GEOGRAPHY, UNIVERSITY OF WATERLOO 
WATERLOO, ONTARIO, CANADA 
Characteristic of Landsat Mosaics for Yukon Territory 
Landsat Mosaics for Yukon Territory,Canada, have been 
compiled in 1975 by the Canada Centre for Remote Sensing, 
(CCR8) and Topographic Survey. Mosaics for the Territory 
belong to the set which covers the whole country (Kesik,1975) 
Mosaics are based on the Landsat 1 images generated by 
the Multispectral Scanner. For the Yukon Territory only ima- 
ges from channel 6, with spectral range 700-806 nm, have been 
used for mosaicing. The images were recorded in period 1972-74 
Selection of the images for mosaicing took into account 
minimum of ice, snow and cloud cover.Limited number of good 
images caused application of those which show frozen lakes, 
snow cover and offshore ice. To eliminate clouds, segments 
of successive images have been used to compose one scene. 
Images used for mosaicing were corrected for earth's 
rotation. Such a correction was done at CCRS centrum in the 
later stage of Landsat operation. Early, noncorrected for 
earth's rotation images were reproduced,segmented and composed 
with required tolerancy od error. 
It is worth to mention that Landsat MSS data is subjected 
to many distortions.Some of the errors have dynamic character 
with unpredictable magnitude and direction, other are syste- 
matic and easy for correction. Interaction of dynamic and 
systematic errors results in total distortion, changina from 
image to image. 
Distortions due to earth's rotation, scan nonlinearity and 
processing errors were removed at CCRS. Remaining residual 
errors are less significant and not important for the scale 
of Landsat mosaics. 
Precise processed MSS data has, according to Colvocaresses 
(1974), sufficient resolution and geometric fidelity to treat 
it as a true map projection - Space Oblique Mercator, Tt is 
unique projection which may be could be used for mosaic 
compilation, but the relevance of such a projection is limited 
by the lack of general or thematic maps produced in this 
projection. 
All existing Landsat mosaics produces in different count- 
ries have been constructed on the base Of projection applied 
to the general maps. The technique of image mapping( Tomlinson, 
1972) is used as the most practical, 
In Canada, Lambert's Conformal Conic Projection was used 
for matching MSS images. This projection is used in Canada 
for 1:1,000.000 maps. Due to the characteristic of Lambert's 
projection compiled area sheets of mosaics could be joint 
only in east-west direction. 
   
  
  
  
  
   
   
  
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
  
     
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