Large scale topography of Io

Details Large scale topography of Io Large scale topography of Io

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pggp.rept..522g&link_type=abstract

In NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986 p 522-523 (SEE N87-23341 16-91)

Physics

Geophysics

Io, Jupiter Satellites, Topography, Albedo, Errors, Geoids, High Resolution, Image Processing, Pixels, Planetary Limb, Planetary Surfaces

Scientific paper

To investigate the large scale topography of the Jovian satellite Io, both limb observations and stereographic techniques applied to landmarks are used. The raw data for this study consists of Voyager 1 images of Io, 800x800 arrays of picture elements each of which can take on 256 possible brightness values. In analyzing this data it was necessary to identify and locate landmarks and limb points on the raw images, remove the image distortions caused by the camera electronics and translate the corrected locations into positions relative to a reference geoid. Minimizing the uncertainty in the corrected locations is crucial to the success of this project. In the highest resolution frames, an error of a tenth of a pixel in image space location can lead to a 300 m error in true location. In the lowest resolution frames, the same error can lead to an uncertainty of several km.

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