The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part Bl. Beijing 2008 
due to the large project-dependent part of the systematic error. 
It is very important in the future to measure DTM bending on a 
block flown at a different GSD than the one used to produce a 
single correction grid. In case such effect is significantly 
reduced, an array of correction grids needs to be computed to 
cover the span of all probable GSDs. 
The main recommendation delivered in this work is that, given 
a photogrammetric block with sufficient redundancy of image 
observations and precise given EO, the best approach to obtain 
a correction grid is to perform a bundle adjustment with 
collocation. When precise GPS is available, the GPS-derived 
Direct Geo Referencing (DGR) EO is used. When no precise 
GPS is available, the self-calibrating bundle adjustment is 
preformed to obtain precise EO and densified control points. 
The DMC virtual images should be generated using the 
correction grids during DMC Postprocessing. 
Another direction of future work is to capture the systematic 
distortion in the individual four PAN cameras by a collocation 
grid using a calibration flight with proper overlap of PAN 
camera footprints (i.e., all parallel strips flown in one direction). 
This work will take care of 35% of total DMC error. Another 
effort is to refine the geometric platform calibration procedure 
to significantly reduce the remaining 65% of DMC error by 
utilizing strong correlation of platform orientation parameters 
from exposure to exposure along a strip. 
Madani, M., Dôrstel C., Heipke C., Jacobsen K. (2004): DMC 
practical experience and accuracy assessment. In: ISPRS 
Proceedings 2004 Istanbul. 
Madani, M (2001). Z/I Imaging New Automatic Aerial 
Triangulation System, ASPRS Annual Conference, St. Louis, 
MO, April 23-27, 2001. 
Madani M., (1985). Accuracy Potential of Non-Metric Cameras 
in Close-Range Photogrammetry Ph.D. Dissertation, 
Department of Geodetic Science and Surveying, The Ohio State 
University. 
Riesinger, I (2006): Investigations on DMC (Digital Mapping 
Camera) Auto-Calibration, Diploma Thesis, Munich Technical 
University, Germany, 2006. 
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