4. GENERATION OF COLOURED MOSAICS 
The generation of products (orthoimages and mosaics) in 
colour follows the same procedure as described before. |f 
appropriate multispectral imagery is available and pro- 
cessed to equivalent geometry the single channels can 
be merged to one RGB file, but the selection and the 
radiometrical preparation of appropriate multispectral data 
for the actual task has to be performed carefully. 
Within the Mars96 Mission HRSC and WAOSS will provide 
imagery with different properties in scale and colour 
(Albertz et al., 1992) These data are going to be used for 
geoscientific interpretation as well as for the generation of 
Topographic Image Maps in various map series. 
While for geoscientific interpretation purposes three 
colours for the RGB file are often derived by the com- 
putation of colour ratios (Wáhlisch et al., 1996), image 
mapping often tries to yield true colour representation. 
Within the production of Topographic Image Maps during 
the Mars96 Mission the IHS colour transformation is going 
to be applied (Tauch et al., 1990). Studies have to be 
made in advance in order to check the capabilities of the 
original HRSC colour data and to derive guidelines for 
processing steps which are necessary to get the targeted 
colour representation. The permanent and unpredictable 
variations in scale within the prospected data as well as 
the possible lack of received image data enforces vari- 
able strategies in the production of colour products. 
5. CONCLUSIONS 
The techniques developed for orthoimage and mosaic 
generation are, together with components for multi-image 
matching, DTM generation and automated cartographic 
software, essential parts of an overall processing line for 
the production of Topographic Image Maps during the 
Mars96 Mission (Albertz et al., 1996). Besides, the de- 
veloped mosaicking approach can be applied to any type 
of imagery. The quality of the products always depends 
on the accuracy of the geometrical processing. 
6. REFERENCES 
Albertz, J., Jeschke, W., Scholten, F., Tauch, R., Zóllner, 
W., 1990. New Developments in Digital Image Map Pro- 
duction. In: Berliner Geowissenschaftliche Abhandlun- 
gen, Berlin, Germany, Reihe A, Band 102.1, pp. 375-398. 
Albertz, J., Ebner, H., Heipke, C., Neukum, G., Scholten, 
F., 1992. The Camera Experiments HRSC and WAOSS on 
the Mars 94 Mission. In: International Archives of Photo- 
grammetry and Remote Sensing, Washington D.C., USA, 
Vol. XXIX, Part B1, pp. 130-137. 
Albertz, J., Ebner, H., Neukum, G., 1996. The HRSC/ 
WAOSS Camera Experiment on the Mars96 Mission — A . 
Photogrammetric and Cartographic View of the Project. 
In: International Archives of Photogrammetry and Remote 
Sensing, Vienna, Austria, Vol. XXXI, Commission IV. 
Jahn, H., Reulke, N., Reulke, R., 1992. Simulation von 
Bilddaten für die Mars-Missionen. Bild & Ton 45 (9/10), pp. 
276-281. 
Kàhler, M., 1989. Radiometrische Bildverarbeitung bei der 
Herstellung von Satelliten-Bildkarten. Deutsche Geodáti- 
sche Kommission, Munich, Germany, Reihe C, Heft Nr. 
348, 101p. 
Lehmann, H., 1996. A New Map Series for the Planet Mars 
— Concept and Realization of the »Topographic Image 
Map MARS 1:200 000«. In: International Archives of Pho- 
togrammetry and Remote Sensing, Vienna, Austria, Vol. 
XXXI, Commission IV. 
Ohlhof, T., 1996. Local, Regional and Global Point De- 
termination using Three-Line Imagery and Orbital Con- 
straints. In: International Archives of Photogrammetry 
and Remote Sensing, Vienna, Austria, Vol. XXXI, Com- 
mission lll. 
Tauch, R., Scholten, F., 1990. Merging and Mosaicking of 
Multisensor Data for the Production of High Quality Image 
Maps. In: International Archives of Photogrammetry and 
Remote Sensing, Tsukuba, Japan, Vol. XXVIII, Part 4, 
pp. 29-38. 
Uebbing, R., 1996. An Automated Digital Approach for the 
Generation of Digital Terrain Models Using HRSC and 
WAOSS Image Data of the Mars96 Mission. In: Inter- 
national Archives of Photogrammetry and Remote Sen- 
sing, Vienna, Austria, Vol. XXXI, Commission Ill. 
Wählisch, M., Zhang, W., Roatsch, T., Oberst, J., Cook, 
A.C., Hiesinger, H., Jaumann, R., 1996. Digital Terrain 
Models and Rectified Color Ratio Mosaics in the Mare 
Orientale Region Derived from Clementine Image Data. In: 
Proceedings of XXVII. Planetary Science Conference, 
Houston, USA. 
Wewel, F., 1996. Determination of Conjugate Points of 
Stereoscopic Three Line Scanner Data of Mars96 
Mission. In: International Archives of Photogrammetry 
and Remote Sensing, Vienna, Austria, Vol. XXXI, Com- 
mission Ill. 
Zhang, W., Albertz, J., Li, Z., 1994. Digital Orthoimage 
from Airborne Line Scanner Imagery Utilizing Flight Para- 
meters. In: International Archives of Photogrammetry and 
Remote Sensing, Munich, Germany, Vol. XXX, Part 3/2, 
pp. 945-950. 
ACKNOWLEDGEMENTS 
Software development for the HRSC/WAOSS camera 
experiment on the Mars96 Mission is supported by DARA 
(Deutsche Agentur für Raumfahrtangelegenheiten). Spe- 
cial thanks to M. Wählisch and Dr. T. Roatsch from DLR 
(German Aerospace Research Establishment) in Berlin- 
Adlershof for their cooperative support. 
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