archeological purposes, but made for map making, for forest survey and for other organizations’ use, which 
. 2 ; 
were heterogenous in every respect. The area covers about a 2500 km “land in West Hungary. The Vas County 
Museums’ Direction determined the uniform standpoints and on this basis the survey extending to greater area 
and coordinated with the method of aerial photographic interpretation was completed. 
This job is an important part of the operation of the Archeological Topography of Hungary controlled by the 
Archeological Institute of the Hungarian Academy of Sciences. The authors display the applied method of 
utilisation of the aerial photographs in large quantities, the mutual relation of the interpretation and the 
traditional land survey, the findspots which one could recognize in spite of the unclassified material they 
treated unfavourable for application. The applied method of charting the results of the interpretation, serves 
as a good example of the relationship of the interpretation and the photogrammetry. This is the subject of the 
IV/VII photogrammetry - photointerpretation intercommission of the ISP, committee's proposals, suggested 
in the III International Symposium, Dresden 1970. 
Our experience may contribute to the more effective utilization of the information of the aerial photographs 
taken for various purposes, the method gives considerable and additional results as compared with the 
traditional methods of archeological survey and in case of smaller economic powers the savings cannot be 
neglected either. 
9. Erickson, J.D. 
United States 
AUTOMATIC EXTRACTION OF INFORMATION 
FROM MULTISPECTRAL SCANNER DATA 
The present status of automatic multispectral scanner data processing and interpretation is evaluated with 
problem areas and suggested approaches discussed. The rationale for automatic information extraction is 
given. 
The basis of spectral discrimination is examined indicating sources of systematic variability which tend to 
obscure the spectral attributes of the classes of interest. 
Automatic processing functions, techniques and methods, and equipment are discussed with emphasis on 
preprocessing for feature enhancement and invariance, which accounts for sources of systematic variability and 
reveals the underlying class signature otherwise obscured. Techniques for carrying out the major functions of 
preprocessing, signature extraction discrimination, display, and post-processing are examined in detail. 
Procedures are reviewed for adaptive discrimination and for estimating the proportions of classes within a 
single ground resolution element. A special purpose multispectral parallel-channel and processor system is 
presented. 
Applications and results are discussed briefly in terms of agricultural and geological surveys to indicate the 
substantial success achieved to date. 
It is concluded that despite the potential demonstrated in the many successful feasibility tests in various 
application disciplines that operational uses of information derived from multispectral sensing of earth 
resources and land use will await development of cost effective processing systems. 
10.  Forsell, M. 
Sweden 
REMOTE SENSING ACTIVITIES IN SWEDEN 
In Sweden, aerial photography has been extensively used in map-making, forest inventory, military 
reconnaissance, geomorphological research, etc. The recently developed technologies, the Symposia on Remote 
Sensing sponsored by the Willow Run Laboratories of the University of Michigan and the great interest in 
environmental monitoring, led, in 1969, to the establishment of national remote sensing committee, sponsored 
by the Swedish Board of Technical Development. 
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