80 
Tab. 1 
Spectral resolutions of the SPOT - and Thematic Mapper scanner 
and of the Landsat 5 / Thematic Mapper 
SPOT - Simulation 
pm 
TM Simulation 
pm 
Landsat 5/TM 
pm 
SS 1 0,50 - 0,59 
TMS 1 0,44 - 0,49 
TM 1 0,45-0,52 
SS 2 0,61 - 0,68 
TMS 2 0,54-0,58 
TM 2 0,52 - 0,60 
SS 3 0,79 - 0,89 
TMS 3 0,62-0,66 
TM 3 0,63 - 0,69 
TMS 4 0,76-0,86 
TM 4 0,76 - 0,90 
TMS 5 1,535-1,705 
TM 5 1,55-1,75 
TMS 6 8,00-13,00 
TM 6 10,4-12,5 
TMS 7 2,105 - 2,368 
TM 7 2,08-2,35 
Tab. 2 Correlation coefficients of forest test areas 
SPOT - Simulation 
SS 1 
SS 2 
SS 2 
0,91 
SS 3 
-0,13 
-0,02 
TM - Simulation 
TMS 2 
TMS 3 
TMS 4 
TMS 5 
TMS 6 
TMS 7 
TMS 1 
0,93 
0,85 
_ 0,27 
0,64 
0,71 
0,72 
TMS 2 
— 
0,94 
0,23 
0,65 
0,76 
0,84 
TMS 3 
— 
1 
o 
o 
NJ 
0,49 
0,71 
0,88 
TMS 4 
— 
0,67 
0,31 
-0,0002 
TMS 5 
— 
0,82 
0,50 
TMS 6 
— 
0,69 
Landsat 5/TM 
Mixed forest testsite 
TM 2 
TM 3 
TM 4 
TM 5 
TM 7 
TM 1 
0,80 
0,82 
0,46 
0,66 
0,72 
TM 2 
— 
0,89 
0,64 
0,75 
0,79 
TM 3 
— 
0,42 
0,67 
0,80 
TM 4 
— 
0,31 
0,65 
TM 5 
— 
0,94 
Landsat 5./ TM 
Deciduous forest 
testsite 
TM 2 
TM 3 
TM 4 
TM 5 
TM 7 
TM 1 
0,87 
0,89 
CM 
O 
1 
0,44 
0,72 
TM 2 
— 
0,94 
-0,22 
0,51 
0,79 
TM 3 
— 
cn 
o 
1 
0,50 
0,80 
TM 4 
— 
0,42 
0,01 
TM 5 
— 
0,82 
4 RESULTS 
4.1 Selection of bands 
An analysis of the correlation coefficients from the 
SPOT-simulation showed very high values between the 
bands in the visible spectral range, suggesting a 
very similar information content. The possibility of 
a good differentiation between the forest classes was 
offered by the selection of bands SS1 (green) and SS3 
(near infrared), further analysis showed that the 
band SS2 (red) had limited value for the research in 
question. 
As in previous research a high correlation was estab 
lished between the visible wavelength of the TM-si- 
mulation bands. However in comparison a lower corre 
lation was to be found between the visible and the 
near infrared wavelengths. In the scene presented 
here, there is a high correlation between bands IMS4 
(near infrared) and TMS5 (middle infrared) for forest 
classes but not for agricultural areas (Tab. 2). 
Therefore the TM-simulation bands TMS2 (green), TMS3 
(red), TMS4 (near infrared) and TMS5 (middle infra 
red 1500 nm) were selected for further interpretation. 
Owing to atmospherical influences band TMS1 (blue) 
was not chosen, band TMS7 (middle infrared 2300 nm) 
because of its limited dynamic range and its high 
correlation with band TMS5 was also not used. 
The correlation values of two forest areas in the 
Landsat 5/TM scene from the 7.7.84 are presented in 
table 2. On the whole they confirm the results of the 
simulation. There exists a high correlation of the 
bands TM4 and TM5 for mountainous mixed forest areas 
similar: to that for the mixed deciduos forest of the 
TM-sirnulation. In comparison there is a low correla 
tion between bands TM4 and TM5 for the lowland-forest 
areas of the Rhine valley in Landsat/TM scene from 
July 1984, which could be a result of different 
moisture content in the forest areas, for example in 
poplar stands. 
Corresponding to the results of the simulation, the 
bands TM2, 3, 4 and 5 were chosen, the bands TM1 and 
7 were also left out here for reasons already ex 
plained . 
4.2 Signati 
The differ« 
fig. 1 was 
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ble bands £ 
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