absolute
jart of the
of these
NE AT) of
the band-
eter data
; airborne
zalibration
salibration
ollimator.
ght from
absolute
contains:
lass. The
« 100 cm?
- and the
els of the
ion (0.4 -
200-Watt
lightened
idiance at
nd a well
Munich -
2-24 1995
43
.g. 1.5-1.8m
Kochel 5500 150 24 Fig. 2 3-5m i
Had 410m N
hel 8000 130 12 Fig. 3 eee >
Koche ig.
812m COLUMATING
spect | LENSES
: > 2.0-2.5m
Table 2: DAIS-7915 Test flight conditions on Do228 A spect
Time: 22 Nov., 1994, 2:30 PM Y
UPPER FOLDING
MIRRORS
The image fragments demonstrated on Fig. 2 and 3
are raw data of the following channels (see Table 3).
ROTATING
45 742 28 POLYGON
LOWER FOLDING
25 925 29 MIRRORS
35 1592 52 llght from
target area
75 9300 560
Table 3: DAIS-7915 wavelengths and bandwidths Figure 1: Principal Optical Scheme of DAIS-7915
The sun elevation angle during these data registration was of about 20 degree only. The sky was partly covered by
clouds.
(The weather was quiet, but mostly overcast. There was only one more or less cloud free region but with relatively
weak illumination due to the low sun angle and clouds in the surroundings.)
The test-site area is located close to Garmisch Partenkirchen at the border of the German Alps. The test-site displays
strong differences in soil moisture due to the variations in organic components in the grassland and moorland area.
The variation in soil moisture can be clearly observed in the thermal band (channel 75).
Although the sun elevation is only of about 20 degrees, differences in vegetation cover and vegetation water content
are clearly displayed in the center of the image comparing the two near infrared bands (15 and 25) and the SWIR
band 35.
Regarding the bad illumination conditions, the dynamic range and various features in the image can be stated as a first
and reasonable result of a qualitative analysis.
References
4. T.G. Chrien, R.O. Green, M.L. Eastwood, "Accuracy of the Spectral and Radiometric Laboratory Calibration of
the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS)", Proc. SPIE, Vol. 1298, pp. 37-49.5, 1990.
2 D. Oertel, B. Zhukov, "On-ground calibration facility and calibration algorithms for wide-angle imaging and video
spectrometric airborne sensors in the VIS-TIR spectral range”, DLR-FB 93-44, DLR, Wessling, 1993.
3. S. H. Chang, M.J. Westfield, F. Lehmann, D. Oertel, R. Richter, "79-Channel Airborne Imaging Spectrometer",
SPIE Vol. 1937 pp 164 - 172, 1993.
IAPRS, Vol. 30, Part 5W1, ISPRS Intercommission Workshop “From Pixels to Sequences’, Zurich, March 22-24 1995
