Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...33..417w&link_type=abstract
Icarus, vol. 33, Mar. 1978, p. 417-440.
Astronomy and Astrophysics
Astronomy
9
Mars Surface, Photomapping, Planetary Gravitation, Relief Maps, Topography, Astronomical Maps, Infrared Radiometers, Mariner 9 Space Probe, Radar Maps, Radio Astronomy, Radio Occultation, Stereophotography, Superhigh Frequencies, Ultrahigh Frequencies, Ultraviolet Spectrometers, Mars, Mapping, Topography, Mariner 9, Surface, Infrared, Ultraviolet, Spectrometers, Radar, Coordinate Systems
Scientific paper
Topographic contour maps of Mars are compiled by synthesizing data acquired from various scientific experiments of the Mariner 9 mission, including S-band radio occultation, the UV spectrometer, the IR radiometer, the IR interferometer spectrometer, and television imagery, as well as earth-based radar information. The entire planet is mapped at scales of 1:25,000,000 and 1:5,000,000 using Mercator, Lambert, and polar stereographic map projections. For the computation of map projections, a biaxial spheroid figure is adopted. The semimajor and semiminor axes are 3393.4 and 3375.7 km, respectively, with a polar flattening of 0.0052. For the computation of elevations, a topographic datum is defined by a gravity field described in terms of spherical harmonics of fourth order and fourth degree combined with a 6.1-mbar occultation pressure surface. This areoid can be approximated by a triaxial ellipsoid with semimajor axes of A = 3394.6 km and B = 3393.3 km and a semiminor axis of C = 3376.3 km. The semimajor axis A intersects the Martian surface at longitude 105 deg W. The dynamic flattening of Mars is 0.00525. The contour interval of the maps is 1 km. For some prominent features where overlapping pictures from Mariner 9 are available, local contour maps at relatively larger scales were also compiled by photogrammetric methods on stereo plotters.
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