The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
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Figure 8. Shaded relief HRSC DTM mosaic
Figure 9. Detail HRSC DTM
Figure 10. Detail MOLA DTM The mean percentage of 5-ray
points for all six orbit strips is 78.5%.
The mean intersection accuracy of all object points used for the
DTM mosaic is 0.6 multiplied by the nominal nadir resolution.
This is equivalent to approximately 7.5 m.
The quality of the derived DTM is well-reflected in the shaded
relief (see Fig. 8, Fig. 9 and Fig. 10). Of course, compared to
the MOLA DTM the higher resolution HRSC DTM mosaic
includes more detail and is altogether more complete.
Figure 11. Ortho mosaic with superimposed color-coded
elevation
Figure 12. 3D-View (part of DTM with false color)
5. CONCLUSIONS AND OUTLOOK
The exterior orientation parameters can be improved for a single
orbit and for image blocks using the bundle adjustment. The
exterior orientation data that were adjusted in a strip can be used
for ortho-image mosaics and DTMs, and provides good results
apart from the elevation difference to the MOLA DTM. The
results of bundle block adjustment provided the best accuracy
and adapt the HRSC-derived data to the global Mars-reference
system very well. So far, four further DTM mosaics of between
two and eleven orbits have been adjusted using bundle
adjustment with good results. Further studies shall show that a
block adjustment with more orbit strips is possible.
REFERENCES
Ebner, H., Spiegel, M., Baumgartner, A., Giese, B., Neukum, G.
and the HRSC Co-Investigator Team, 2004. Improving the