Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51c1214s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51C-1214
Mathematics
Logic
5464 Remote Sensing, 6225 Mars
Scientific paper
The Mars Orbiter Laser Altimeter, part of the instrument suite onboard the Mars Global Surveyor spacecraft (MGS), mapped the Martian topography between 1999 and 2001. The latest mid-latitude dataset, released in 2003, is a 128 pixel per degree digital elevation model (DEM) of the planet, from -87o to +87o. Due to the orbital characteristics of MGS, the nominal resolution is latitude-dependent, being highest at the poles. We find that only a third of the elevation information at the equator comes from raw measurements, the rest being interpolated. Without questioning the enormous scientific value of this dataset, we investigate its limitations. We find that interpolation, especially at the equator, leads to geomorphological artifacts and smoothing of the terrain that should be appreciated in interpreting features that have length scales on the order of the spacing between orbital tracks. We also re-interpolate the dataset using a natural-neighbor with bias scheme that is shown to reduce interpolation-induced errors, particularly for small-scale, East-West trending geomorphic features.
Greenberg Harvey M.
Montgomery David R.
Som Sanjoy M.
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