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The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B4. Beijing 2008
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uncontrolled mosaics from the VEXCEL Level 2 files. We are
also developing (with the assistance of colleagues at Arizona
State University) an ISIS sensor model that will allow Level 1
products to be orthorectified by projection onto a DTM of
choice. With further development based on this sensor model,
bundle adjustment of Mini-RF Level 1 images in ISIS and the
production of controlled mosaics will be possible. Finally, we
are developing the software to import Level 1 images into
SOCET SET and a SOCET sensor model that will permit
bundle adjustment and DTM extraction. The design of the ISIS
and SOCET sensor models for Mini-RF is tremendously
simplified by the availability of the Level 1 products. After
calculating the range-Doppler coordinates of a ground point by
the same calculations used for Magellan and Cassini, it is
necessary merely to iterate to find the time at which the
Doppler shift is zero, then carry out a simple transformation to
Level 1 line and sample coordinates. In particular, there is no
need for a database or bit map to determine what radar burst
observed the given ground point. We expect confidently to be
able to make controlled image mosaics by performing bundle
adjustments in ISIS and/or SOCET SET, and to make stereo
DTMs with useful post spacing on the order of 200-300 m.
Although such products may ultimately be superseded by the
very accurate, high density laser altimetry data expected from
LRO and several of the other missions, they may provide the
best interim topographic information about polar regions
hidden from the sun and from Earth-based radar mapping.
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