8 
severe damaged 
0 
damaged 
Stand 24 (A) □ 
healthy/slightly 
Stand 20 (B) 
Stand 16 (C) 
damaged 
Fig.(3): showing classification results 
from different data acquisition methods 
of same stand: 
1: results of visual interpretation of 
CIR photographs . 
2: Airborne multispectral scanner 
acquired from 1000m altitude above ground 
3: Airborne multispectral scanner 
acquired from 3000m altitude above ground 
4: Landsat-TM from 19S5. 
5: Landsat-TM from 1986. 
also been counted in each stand also 
according to different damage levels, and 
respective numbers in percentage have 
been calculated. Both percentages have 
been set off against and compared with 
each other. Fig.(3) Contains the results 
of of CIR photo interpretation, Airborne 
multi spectral scanner and the results of 
2 landsat-TM acquired at Sept.13. 1985 
and June 27. 1986. Fig. (3) also shows 
the development of the percentage of the 
damage level from 1985 to 1936 for three 
stands. All the data set (CIR photo 
graphs, Airborne multispectral scanner 
and landsat-TM 1935) have been acquired 
approximately in the same time during the 
summer in 1985. 
As far as the test site at Erzgebirge is 
concerned it was not possible to carry 
out a verification and analysis of the 
results obtained from landsat images on 
the same method such as the test sit--, at 
St.Blasien., due to the lack of field 
and/or CIR photographs. The user deter 
mined a certaine damage levels especially 
for this test site (see ch.2). The main 
verification methodology of the results 
was the comparison with the interpreta 
tion of infra red color composit from the 
original data. 
Results of supervised classification are 
shown in photo (4 and 5). 
To estimate the forst decline development 
between 1976 and 1985, results of the 
evaluations have been taken as a basis 
for the calculation. A part of the test 
site Erzgebirge has been delinated by a 
poligon on classified images of 1976 and 
1935. The area covers about 51.717 ha. 
And is estimated by pixel number and 
pixel size. 
All the classified pixel in this poligon 
on the results of 1976 and 1935 have been 
counted according to the damage levels. 
(Tab.2) gives information about the 
situation of the forest area changing 
between above mentioned period. 
Damage Landsat 
Level MSS 
26.06.1976 
healthy/ 8 Ga 
slight ly 
sever ely 
dead forest 
and clear 20% 
cut area 
Landsat 
TM 
30.09.1985 
48% 
52% 
Tab. 2: Forest damage development- in the 
period 1976-1935. 
431