me is concerned the 
as follows. The pro- 
nvestigations on the 
magery in 1977. At 
nner (EOS) - today 
n Munich - with one 
aircraft; further an 
built. 
sensor of its 1st ge- 
by MOMSO01 — were 
ce Shuttle about ten 
of the technology in 
with an at that time 
| were collected. The 
e of an international 
| a data exchange ag- 
01 camera design the 
developed. This sen- 
301 because it fulfills 
c imagery 
ultispectral imagery 
the second German 
| April 26 till May 6, 
ate automatically di- 
ow-up products with 
iations in height less 
ta fusion of thematic 
dels and to integrate 
ation Systems (GIS). 
s slightly modified to 
ice Station MIR from 
IRODA). The objec- 
an cooperation are as 
eration in Earth Ob- 
ation algorithms for 
strategy for earth ob- 
nowledge up to now 
used for further de- 
1 an open question in 
e discussions about a 
al towards the end of 
erage and a resolution 
2. MOMS02 TECHNICAL PARAMETERS 
The main advantage of the MOMSO2 sensor in compa- 
rison with existing earth oberservation satellites , for 
example LANDSAT TM and MSS as well as SPOT are 
as follows. 
First MOMS02 has the highest resolution of a digital 
earth observing sensor we ever had. The high resolution 
panchromatic channel has about 4.4 m? ground pixel 
resolution considered from an altitude of 296 km. But 
besides that it offers for the first time along-track stereo 
capability which means the stereo-imagery geometry is 
overlapping during flight in one orbit contrary to the 
stereo capability of SPOT generated by data takes from 
different orbits. The MOMS02 stereo imagery concept 
can be seen in figure 1. A stereo image is generated 
by forward and backward looking lenses with a ground 
pixel resolution of about 13.2 m2. These data are to be 
fusioned with the high resolution channel. This reason 
gives the optimism to generate digital terrain models 
of less than 5 m in height accuracy. The base line of a 
stereo scene is about 120 km with a swath width of 78 
km, except the high resolution channel with a swath 
width of 37 km. 
The MOMS02 camera was designed and built by 
DASA Munich (former MBB Munich) in close coope- 
ration with DARA and the MOMS02/D2 science team 
with three principal investigators: Prof. F. Ackermann, 
Stuttgart University (photogrammetry), Prof. J. Bo- 
dechtel, University of Munich (thematics) and Prof. F. 
Lanzl, DLR Oberpfaffenhofen (combination of stereo 
and thematics). Both groups — stereo and thematics — 
are driven by co-investigators and a powerful team of 
12 young scientists. The general tasks of the science 
team was besides the cooperation for camera design 
the software development to process the data taken by 
the D2 mission. 
MOOE 1 STEREO S7 
MODE 2 MS Vry4 
MODE 3 MS 34 STEREO &7 
MOOE 4 MS 14Y4, STEREO 6 
MOOE 5 M8 1/34, STEREO 7 
  
Fig.1: Along-track stereo capability 
How does the technology of the MOMS02 camera 
look like? As indicated before the camera has alto- 
gether five lenses. The stereo module carries one ver- 
tically looking lens with focal distance of 660 mm for 
the high resolution channel and two tilted lenses with 
focal distance 237 mm. In figure 2 one can see that 
these three lenses are quite dominating. The other two 
lenses are used for multispectral imagery, each of it has 
a focal length of 220 mm and two CCD line arrays for 
different spectral recording characteristics located in 
the focal plane. 
To summarize the MOMS technology the stere mo- 
dule consists of generally four Fairchild 191 CCD line 
arrays with each 6000 pixels/line whereby two line ar- 
rays have been merged each other for the high resolu- 
tion panchromatic channel. The tilting of the backward 
and forward channel is about 21.43 degrees - all three 
line arrays are sensitive within the panchromatic spec- 
tral range of 520-760 nanometers and have a resolution 
in radiometry of 7 bit. 
  
Fig. 2: MOMSO02 optics module 
Table 1: Stereo module parameters 
  
four CCD line detectors 
pixel size 10x10um 
FAIRCHILD CCD 191 
high resolution channel 12000 pixel/line 
(8500 are used) 
6000 pixel/line 
6000 pixel/line 
backward channel 
foreward channel 
convergence angle 21.43 deg 
spectral range 520 - 760 nm 
focal length HR: 660 mm 
BW/FW: 237 mm 
radiometric resolution 7 bit 
geometric resolution HR: 4.4 m 
  
  
(296 km altitude) BW/FW: 13.2 m