Full text: Proceedings of the Symposium on Global and Environmental Monitoring (Part 1)

51 
CIR-FILM 
MULTISPECTRAL DATA 
SOURCE 
KODAK "AEROCHROME INFRARED 2443" 
SCALE 1:3000/10000 
DAEDALUS ATM 
SPATIAL 
KODAK "HIGH DEFINITION AEROCHROME" 
SCALE ABOVE 1:10000 
LANDSAT-TM 
RESOLUTION 
SPECTRAL 
HIGH 
LOW 
REGION 
SPECTRAL 
SMALL: 0,5 - 0,9 mm 
LARGE: 0,4-14 mm 
RESOLUTION 
DYNAMIC 
LOW 
HIGH 
RADIOMETRIC 
RANGE 
LOW 
HIGH 
AVAILABLE 
PRODUCTS 
AERIAL PHOTOGRAPHS 
DIGITAL IMAGERY ON CCT 
REPRODUCTION 
DEGRADED COPIES 
NO DEGRADATION 
RADIOMETRIC 
DEPENDENT ON: EMULSION; 
FIDELITY 
ILLUMINATION/TURBIDITY, STORAGE & 
CALIBRATED RADIANCES/ 
HANDLING, FILM PROCESSING 
REFLECTANCES 
IMAGE 
- SUBJECTIVE 
- OBJECTIVE 
PROCESSING/ 
- TIME CONSUMING 
- COMPUTERIZED PROCESSING 
EVALUATION 
- TEDIOUS 
- NEED OF GEOMETRIC AND 
- TRAINED PERSONNEL REQUIRED 
RADIOMETRIC PROCESSING 
APPLICATION 
STATUS 
OPERATIONAL 
EXPERIMENTAL 
Table 2 COMPARISON OF CIR-FILM AND MULTISPECTRAL DATA PERFORMANCE 
FOR FOREST DAMAGE EVALUATIONS 
if possible already at an early stage 
of development. 
3. Spectral measurements 
Within the frame of the measurement 
program the reflected spectral 
radiance of tree components was 
recorded. 
In the laboratory diffuse radiation, 
absorption and scattering by the 
atmosphere were not simulated. The 
influence of layer staggering 
(biomass), discolouration (yellowing) 
and morphologie of branches of 
healthy and damaged branches of beech 
(fagus silvatica) and spruce (picea 
abies) was measured in a time period 
of high spectral stability, as 
measured by Tanner et al., 1981. 
The suitability of available multi- 
spectral scanner data of Landsat-TM 
SPOT and Daedalus for the detection 
of healthy and damaged vegetation was 
assessed. 
The measurement configuration 
simulated data acquisition of a nadir 
looking scanner at noon, viewing 
angle 0 degrees, illumination angle 
30 degrees. Each measurement was made 
under identical geometrical con 
ditions . 
Selected trees were classified 
according to the German forest damage 
classification scheme, which is 
identical with the UN-ECE scheme in 
table 1. 
Near Oberpfaffenhofen healthy 
branches of beech and spruce were 
selected in July 1988. Spectral 
measurements were done immediately 
after the cut. The results are 
presented in two reports, Hoffmann 
et al., 1989 a, 1989 b, and are 
displayed in figures 1-4. 
In August 1989 healthy and damaged 
beech trees were selected in the 
Grafendorfer forest. These beeches 
were 100 - 120 years old. At 30-35 m 
height branches from the crown in SW 
direction were cut, brought to the 
ground and recut under water. To 
avoid water stress the cut edge of 
each branch was soaked in water, 
covered with a wet tissue paper and 
enveloped by a plastic bag filled 
with water. 
Spruce branches were collected in the 
Hohenkirchner Forst at about 20-25 m 
height in the SW-crown section of 
more than 90 years old Norway spruce 
trees. They were prepared following 
the same procedure as mentioned for 
beech, to avoid water-stress. 
These branches were gathered in a 
joint effort with the Gesellschaft 
fur Strahlen- und Umweltforschung 
m.b.H. (GSF), Neuherberg near 
Muenchen. Branches and branch 
components were measured with the 
IRIS MARK IV spectroradiometer in the 
laboratory for optical information 
processing. Measurement results are 
shown in figures 5-8.
	        
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