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Geologic Investigations Series Map I-2785

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### Prepared for The National Aeronautics and Space Administration

# Topographic Map of the Northwest Loire Valles Region of Mars MTM 500k -15/337E OMKT

#### By U.S. Geological Survey

| Summary
This map, compiled photogrammetrically from Viking Orbiter stereo image pairs, is part of a series oftopographic maps of areas of special scientific interest on Mars.MTM 500k –15/337E OMKT: Abbreviation for Mars Transverse Mercator; 1:500,000 series; center ofsheet latitude 15° S., longitude 337.5° E. in planetocentric coordinate system (thiscorresponds to –15/022; latitude 15° S., longitude 22.5° W. in planetographic coordinatesystem); orthophotomosaic (OM) with color coded (K) topographic contours andnomenclature (T) [Greeley and Batson, 1990]. 

The figure of Mars used for the computation of the map projection is an oblate spheroid (flattening of          1/176.875) with an equatorial radius of 3396.0 km and a polar radius of 3376.8 km (Kirk and others,          2000). The datum (the 0–km contour line) for elevations is defined as the equipotential surface (gravitational          plus rotational) whose average value at the equator is equal to the mean radius as determined by          Mars Orbiter Laser Altimeter (Smith and others, 2001).

The image base for this map employs Viking Orbiter images from orbit 651. An orthophotomosaic wascreated on the digital photogrammetric workstation using the DTM compiled from stereo models. IntegratedSoftware for Imagers and Spectrometers (ISIS) (Torson and Becker, 1997) provided the softwareto project the orthophotomosaic into the Transverse Mercator Projection.           | First posted April 4, 2003
-  **Map** PDF (22.7 MB) 
-  **Map** EPS (80.4 MB)    This map is 28 x 40 inches and is best reproduced on a large-format plotter at 600 dpi or greater. 

For questions about the content of this report, contact Mark Rosiek

**For additional information, contact:**Astrogeology Science CenterU.S. Geological Survey2255 N. Gemini DriveFlagstaff, AZ 86001http://astrogeology.usgs.gov/

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### Suggested citation:

Geological Survey (U.S.), 2003, Topographic Map of the Northwest Loire Valles Region of Mars MTM 500k -15/337E OMKT: U.S. Geological Survey Geologic Investigations Map I-2785, 1 plate, *https://pubs.usgs.gov/imap/2785/*.

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U.S. Department of the Interior |            U.S. Geological Survey           	URL: *http://pubsdata.usgs.gov/pubs/imap/2785/index.html*            Page Contact Information: GS Pubs Web Contact           	Page Last Modified: Wednesday, 30-Nov-2016 17:41:10 EST