FIRST EXPERIENCE WITH STEREOCOMPILATION OF MOMS-02 SCENES ON THE ANALYTICAL PLOTTER 
Egon Dorrer, Werner Maier, Xiuguang Zhou 
Institut für Photogrammetrie und Kartographie, Universität der Bundeswehr München, Germany 
Commission IV, Working Group 2 
KEY WORDS: Mapping, Experiment, Orientation, DEM/DTM, GIS, Analytical Plotter Software, Three Line Push Broom 
Scanner, Along Track Stereo Restitution. 
ABSTRACT 
The paper describes our experience with photogrammetric stereo compilation and 3-D restitution from high precision photo co- 
pies derived from spaceborne digital image data captured with the MOMS-02 three-line stereo scanner camera during the German 
D2 space shuttle mission in the spring of 1993. Basis of the experimental study is a real-time program module, MOMS, developed 
for the Planicomp P-series analytical plotters running both under VMS on VAXstation and UNIX on Silicon Graphics Indigo as 
host. The software package is complemented by ORIMOMS, an adjustment routine for the determination of the kinematic orienta- 
tion of MOMS-02 stereo scenes. Performance and results of several experiments with MOMS-02 stereo imagery at scale 
1:337,500 and 13.5m ground resolution are discussed in detail. The results indicate a surprisingly high accuracy potential, par- 
ticularly for heights. Despite the problem of the identification of ground features and notwithstanding interpretation errors, exter- 
nal accuracy may be characterized by rms-errors in the range 4-10m. Inner precision, however, is in the range of 2-4m. Con- 
ventional contour plots at the scale 1:50,000 with 5m interval confirm this inner geometric consistency. The software package 
MOMS is ready for photogrammetric production work. 
INTRODUCTION purely digital image processing techniques, we have been 
consistently pursuing the analytical photogrammetric way. 
The Modular Opto-electronic Multispectral Stereo Scanner, Obviously, the majority of work in photogrammetric practice 
MOMS-02, developed in Germany, was specifically designed is being carried out in analog/analytical fashion and will cer- 
for the generation of high precision digital terrain models and tainly continue to do so for the next decade. 
ortho imagery from space in order to meet map specifications 
at 1:50,000 and larger. Complementary to this mapping func- 
tion is multispectral imagery to support environmental remote 
sensing (Fritsch, 1994). In April 1993, MOMS-02 was carried 
into space for the first time on board the Space Shuttle, as part 
of the experimental German Spacelab D2 Mission. During a 
period of ten days, digital image data were captured from an 
orbit of 28.5° inclination at 300 km altitude over parts of 
Africa, Asia, South and Central America, and Australia (Seige 
et.al... 1993). 
v 
MOMS-02 is a push-broom scanner type three-line digital 
CCD-camera with three panchromatic channels (fore, nadir 
and aft). The high resolution nadir channel has a ground reso- 
lution of 4.5 m, the two stereo channels and the four multi- 
spectral (nadir) channels furnish 13.5 m. Depending on the 
selected mode, swath widths of 37 and 78 km are obtained. ; : : 
For further details see (Seige et.al., 1993). With its along- Fisure 1: Along track MOMS 02 stereo configuration 
track stereo capability (Fig. 1), MOMS-02 distinguishes fav- 
  
orably from SPOT's across-track stereo configuration, the KINEMATIC MODEL ORIENTATION 
reason being that stereo imagery is captured practically simul- 
tansousiy omth& same orbit: Unlike the static geometric orientation of conventional per- 
hi tive fr. hotography, the orientation of scanned imag 
The responsibilty of analysing and processing the image data SDeceve Eme p Gtograo iy, Cae Orientation OT scd ; T 
; a Bw ery is a kinematic process and must, therefore, be describe 
collected during the experimental mission lies within a Ger- ; : b 
ur accordingly. Although the ultimate goal for future missions 
man research team, the photogrammetry part of which is T e A nn 
: ; : would be a precision onboard position and attitude determina 
being coordinated through the Institute of Photogrammetry at : ; : : ; ; 
Stuttgart "Uni Kv. A temi t of k tion, e.g. by means of kinematic GPS combined with INS, this 
a À b cie y, a preummry aceaum e 99 A Ja) a has not been the case with MOMS-02. Consequently, investi- 
cape N LIS Soup S Een m (Dort. )- e we gations into indirect solutions to the kinematic orientation 
main goal consists in developing automated methods for the x d 
: : es sea : problem have been carried out. (Kornus et al., 1995) an 
extraction of 3D terrain and topographic object information by 
540 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B4. Vienna 1996 
  
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