Fig. 1 Spectral signature of forest classes for the 
SPOT - Simulation bands ( SS ) 
Fig. 2 Forest classes in the feature plans of the 
SPOT - Simulation bands SS 1 & SS 2 
8- 
Spru 
Cult 
Clea 
Fig. 3 Spi 
TM 
Fig . 4 For 
TM 
Tab. 5 Minimum and Maximum for stratification of 
forested areas 
Minimum 
Maximum 
TM 
1 
71 
90 
TM 
2 
26 
38 
TM 
3 
22 
47 
TM 
4 
31 
70 
TM 
5 
9 
53 
TM 
6 
93 
116 
TM 
7 
9 
31 
a) Old timber and young timber 
b) Pole timber and saplings 
c) Cultures 
d) clearings 
However the overlapping of signatures between the age 
classes is possible, as for example between cultures 
and saplings. It depends on the mixture and the in- 
homogenity of the stands. 
The evaluation of the multitemporal Landsat 5/TM scene 
offered the following possibilities of differentia 
tion: 
Within the different tree types, stands of poplar 
could only be clearly seperated from mixed deciduos 
stands in the summer scene by using the signature 
difference in the middle of the infrared (Fig. 5); 
This difference may be caused by the differing mois 
ture levels of site conditions and leaves. 
For the coniferous trees band TM4 offered the best 
possihilit: 
young pine 
higher levc 
pines. How* 
site, but 1 
(Fig. 6). 
In the sumr 
of pine frc 
seperation 
well as frc 
ble just b} 
scene (Fig. 
of the Apri 
ces. 
Ihe summer 
able sepere 
mixed decic 
a) Cultui 
b) Pole t 
c) Young