International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B4. Istanbul 2004 
  
D atem 
  
  
  
  
  
  
Fig. 7: Left: Small portion of the HRSC swath within the Olympus Mons caldera, obtained during orbit 37. The black 
rectangle (size: approx. 2 x 4 km) marks the area, where SRC images were obtained. Right: Mosaic of two SRC images. 
7. SUMMARY 
Though MarsExpress is still in the commissioning phase 
and though little time has been available for a first image 
data analysis, we can draw the following preliminary 
conclusions: 
Relative Accuracy: 
* Even with nominal navigation data, solid ray intersections 
(+/-20 m) and reliable terrain models can be derived 
Absolute Accuracy: ; 
Excellent qualitative agreement between HRSC and MOLA 
terrain models 
* Typical offsets in absolute height approx. 50 m (more 
orbits to be studied!) 
* Offsets in lateral positioning approx. 100 m, mostly along- 
track (more orbits to be studied!) 
SRC Mapping: 
* Positioning of most SRC images in good agreement with 
context HRSC (Level-3) scenes 
* Mosaicking of SRC-orthoimages is straightforward 
* Time-tag and positioning errors as well as image quality 
issues must undergo further studies 
We expect that the data products from HRSC/SRC will 
stimulate major advancements in the geology and 
geophysics of Mars. 
References: 
Albertz, J., S. Gehrke, M. Wählisch, H. Lehmann, T. 
Schumacher; G. Neukum, and the HRSC Co-Investigator 
team, Digital cartography with HRSC on Mars-Express, this 
meeting. 
Ebner, H., M. Spiegel, A. Baumgartner, B. Giese, G. Neukum, 
and the HRSC Co-investigator team, Improving. the exterior 
orientation of Mars-Express HRSC imagery, this meeting. 
Heipke, C., R. Schmidt, R. Brand, J. Oberst, G. Neukum, and 
the HRSC Co-investigator team, Performance of automatic 
tie point extraction using HRSC imagery of the Mars- 
Express mission, this meeting. 
Neumann, G.A., F.G. Lemoine, D.E. Smith, M.T. Zuber, The 
Mars Orbiter Laser Altimeter Archive: Final Precision 
Experiment Data Record Release and Status of Radiometry, 
Lunar Planetary Science XXXIV, #1978, 2003. 
Oberst, J., B. Giese, T. Roatsch, K. Eichentopf, W. Tost, A. 
Harris, R. Reulke, R. Jaumann, and G. Neukum, Mars '94/'96 
Pushbroom Cameras: Plans for Ground Data Processing and 
Analysis, ISPRS Vol. XXX, Part4, 533-540, 1995. 
Smith et al., Mars Orbiter Laser Altimeter: Experiment 
summary after the first year of global mapping of Mars, J. 
Geophys Res., Vol. 106, No. E10, 23,689-23,722, 2001.