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Technical Note An evaluation of interpolation methods for Mars Orbiter Laser
 

Summary: Technical Note
An evaluation of interpolation methods for Mars Orbiter Laser
Altimeter (MOLA) data
O. ABRAMOV* and A. MCEWEN
Lunar and Planetary Laboratory, University of Arizona, 1629 E. University
Boulevard, Tucson, AZ 85721-0092, USA
(Received 26 February 2002; in final form 29 April 2003 )
Abstract. The Mars Orbiter Laser Altimeter (MOLA) instrument on the Mars
Global Surveyor (MGS) spacecraft has returned a large amount of data on the
topography of Mars. It is possible to generate high resolution digital elevation
models (DEMs) from these data by employing data interpolation techniques.
Four interpolation algorithms were selected for testing on MOLA data:
Delaunay-based linear interpolation, splining, nearest neighbour, and natural
neighbour. These methods were applied to the MOLA data of Korolev crater for
qualitative analysis. In addition, a DEM of a part of Iceland was used for
quantitative testing by simulating MOLA data acquisition, interpolating those
data, and then calculating the mean absolute error (MAE) between the
interpolated and original DEM. Execution speeds were measured for the four
algorithms. The natural neighbour method proved superior both quantitatively
and qualitatively to other methods tested, but is relatively slow computationally.

  

Source: Abramov, Oleg - Lunar and Planetary Institute

 

Collections: Geosciences; Physics