Ralf Reulke
TARGET RELATED MULTISPECTRAL AND TRUE COLOUR OPTIMIZATION OF THE
COLOUR CHANNELS OF THE LH SYSTEMS ADS40
Ralf REULKE , Karl-Heinz FRANKE, Peter Fricker ”, Torsten POMIERSKTI , Rainer Sandau””, Maria von
SCHÔNERMARK’, Carmen TORNOW, Lorenz WIEST"
" German Aerospace Center DLR, Germany
Institute of Space Sensor Technology and Planetary Exploration
ralf.reulke C dlr.de
"" Ilmenau Technical University, Germany
Faculty Computer Science and Automation
karl-heinz.franke @ prakinf.tu-ilmenau.de,
""LH Systems GmbH, Switzerland
fricker @lh-systems.com
Working Group 1/3
KEY WORDS: CCD, Camera, Sensors, Multispectral Data, Radiometric Qualities, Remote Sensing.
ABSTRACT
The LH Systems ADS40 airborne digital sensor is the first commercial digital CCD-line scanner for photogrammetric
applications. CCD sensors allow true radiometric measurements in images. Multispectral channels, in addition to the
stereo channels, can simply be incorporated together in one focal plane. Multispectral imagery with high spatial
resolution opens new remote sensing capabilities. Data fusion between the channels and other sensors together with
additional digital elevation models derived from panchromatic stereo data create new scientific opportunities. Besides
multispectral applications, true colour images become more important for photogrammetric applications and are to be
derived from colour processed multispectral images. When choosing multispectral bands narrow band filters on
interesting spectral features are necessary. Therefore true colour images have to be derived from the multispectral
channels. This paper shows an approach to fulfil both multispectral and true colour requirements.
1 INTRODUCTION
The ADS40 is the first commercial digital CCD-line scanner for photogrammetric applications. The main features of
this airborne digital sensor are:
e High area coverage performance (field of view, swath)
e High resolution and accuracy (spatial and radiometric)
e Multispectral imagery
e Stereo capability
e Direct digital workflow
e Affordable, application oriented sensor.
Spectral | TM ATM SPOT AVNIR | Polder MOMS | AVHRR | BIRD DPA
band (USA) (USA) (France) | (Japan) | (France) | (Germany) | (USA) (DLR) |(Germany)
0.42-0.45 0.42-0.46 P
Blue 0.45-0.52| | 0.45-0.52 0.42-0.5 | 0.42-0.46 | 0.44-0.505 0.44-0.525
0.47-0.51
Green 0.52-0.6 0.52-0.6 0.5-0.59 0.52-0.6 |0.545-0.585| 0.53-0.575 0.52-0.6
0.605-0.625
Red 0.63-0.69| | 0.63-0.69 0.61-0.68 | 0.61-0.69 |0.65-0.69 P| 0.645-0.68 | 0.55-0.68 | 0.6-0.67 F | 0.61-0.685
0.695-0.75
NIR 1 0.76-0.9 0.76-0.9 0.79-0.89 | 0.76-0.89 |0.745-0.785| 0.77-0.81 0.725-1.1 |0.84-0.89 N| 0.77-0.89
0.845-0.885 0.84-0.89 B
NIR2 0.91-1.05 0.89-0.93
Table 1. Spectral channels of selected multispectral instruments (in the visible and near infrared spectral part)
244 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B1. Amsterdam 2000.
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