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Title
Proceedings of the Symposium on Global and Environmental Monitoring

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.