The International Archives o f the Photogrammetrv. Remote Sensing and Spatial Information Sciences. Vol. XXXVILPart B4. Beijing 2008 
analysis of HiRISE camera. For evaluation, a single CCD pixel 
was projected onto the Martian surface using telemetry EO data 
under the assumption that Mars is a sphere with its radius derived 
from the nearest MOLA point. The projected footprint was 
compared with another projected footprint using EO parameters 
from second-order polynomials under the same spherical 
assumption. A maximum difference of 2 meters, corresponding 
to 7 pixels, was detected from the comparison in this 
20-kilometer track on the Martian surface. However, for a small 
mapping area (for example, one square kilometer), the effect is 
smaller than 0.1 meter on the ground. This corresponds to only 
one third of a pixel on the image which is insignificant. However, 
further investigation on jitter will be performed so that its effects 
can be removed or reduced when mapping large areas. 
potential of further orbital-ground integration. The effect of 
orbital jitter, which is small motions of spacecraft around its 
nominal pointing, is evaluated in this paper. This study suggests 
that the topographic effect of jitter is insignificant when mapping 
small areas; however, further investigation on jitter needs to be 
performed so that its effect can be removed or reduced when 
mapping large areas. 
ACKNOWLEDGEMENT 
This work is sponsored by the National Aeronautics and Space 
Administration (NASA). 
REFERENCES 
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Figure 5. Residuals after subtracting best fitting polynomial from 
original telemetry EO data 
6. CONCLUSIONS 
The rigorous geometric model for HiRISE is developed in this 
paper incorporating the sensor calibration data provided by 
USGS. Mosaic of multiple image strips taken by HiRISE could 
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