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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