A a, GL. 
A n aie 
an SCI RATE 
IE ES EE A rl LS 
SEES 
use map has been printed out with the ink jet plotter directly on transparen- 
cies upon the topographic map in 1:50 000. 
The classification results agree with the general distribution of forest 
land, agricultural land, hydrography and urban land, but in details there 
are many deviations if you compare with an ordinarytopographic map. Several 
pixels representing agricultural fallow fields have been classified as forest- 
ry clear cuts and several pixels representing grass-grown clear cuts have 
been classified as agricultural fields. One recently clear cut forest area 
has been classified as an urban area. It is obvious that it is not possible 
to separate different kinds of areas lacking vegetatTon at this registration 
date. Pine and spruce forests can not either be separated in this single 
registration. More details of the project is given in a preliminary report 
by Wastenson et al (1975). 
It can be pointed out that the classification results are not good enough 
in this kind of terrain for practical use in physical planning purposes. 
Probably the multi-date analysis, which we now are going to start, will 
give a higher accuracy. 
Swedish airborne MSS campaign in 1975 
In July 1975, the first project using airborne multispectral scanning radio- 
meter was carried out in Sweden. 
Data were collected with a 10 channel analog Daedalus scanner, on loan from 
CNES in France. During 10 days seventeen test areas were registered for 
forest and agricultural inventories, mapping of vegetation and land use 
and for water quality studies (Figure 6). 
The total length of the registration strips were 500 km and the effective 
recording time 106 minutes. Most of the registrations were made from alti- 
tudes of 3 500 and 6 000 metres with a ground resolution of 9 and 15 metres, 
respectively, About 70 persons were engaged in the ground truth registrations 
during the recording period. A brief description of the data collection phase 
and the various application projects has been given by Wastenson and Borg 
(1977). 
The conversion of the analog MSS-signals to digital data in a desired for- 
mat presents several problems in terms of A/D-conversion, data handling, 
data quality and structure. Most of the data have been converted at the 
National Defense gesearch Institute (FOA) and a description of this phase 
of the project is given by Akersten (1978). 
Several Swedish university departments and government agencies are participating 
actively in the "MSS-75" project. These research groups cooperate with FOA 
in the computer analysis and classification of MSS data. 
Ten projects have finished their classification work and are now evaluating 
their results. Only one project, dealing with identification of crops, has 
published their results (Bertilsson et al, 1977) and evaluated the classifi- 
cation accuracy from a registration altitude of 1000 m and an approximate 
ground resolution of 2.5 m. 
    
   
   
   
  
   
   
   
    
     
  
    
     
  
  
   
    
    
Figure 6. 
Swedish ¢ 
in 1975. 
A summar) 
classifi« 
Table 3. 
Wheat (fe 
Oats 
Barley, 
Barley, i 
Barley ai 
0il-yiel 
Lawn 
Fallow