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92- 10920COLOR-CODED GLOBAL TOPOGRAPHIC MAPS OF MARS, Sherman S. C.
Wu, Annie E. Howlngton-Kraus, and Karyn Ablin, U.S.
Geological Survey, Flagstaff, Arizona 86001
A Digital Terrain Mod_I (DTM) has h--n derived with both
Mercator and Sinusoidal Equal-Area projections from the
global topographic map of Mars at a scale of Iz15 million and
a contour interval of I km [I]. Elevations on the map are
referred to the Mars topographic datum that is defined by the
gravity field at a 6.l-millibar pressure surface with respect
to the center of mass of Mars [2]. The DTM has a resolution
at the equator of 1/59.226 ° (exactly 1 km) per pixel [3]. By
using the DTM, we have generated color-coded global maps of
Mars' topography in both the Mercator projection (Figure i)
and the Sinusoldal Equal Area projection (Figure 2). On both
maps, colors indicate i km increments of height. From the
equal-area dataset, the positive and negative elevation
distributions are calculated to be 67% and 33%, respectively.
The color-coded global topographic map in Mercator projection
will be published as a USGS map.
References
[1] U.S. Geological Survey, 1989, Misc. Inv. Set. Map 1-
2030, 3 sheets.
[2] Wu, S. S. C., 1981, Annales de Geophysique, Centre
National de la Recherche Sclentiflque, Numero 1,
Tome 37, p. 147-160.
[3) Wu, S. S. C., and Howlngton-Kraus, A. E., 1987, LPS
XVIII, p. 1108-1109.
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https://ntrs.nasa.gov/search.jsp?R=19920001702 2018-09-12T14:12:57+00:00Z
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