Digital Database of the Geologic Map of the Athabasca Valles Region, Mars
By Laszlo P. Keszthelyi, Alexandra E. Huff, and Windy L. Jaeger
U.S. Geological Survey
Scientific Investigations Map 3477
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Rationale and Intent:
This geologic map was authored by Laszlo P. Keszthelyi, Alexandra E. Huff, and Windy L. Jaeger in 2021, and has been digitized as a GIS product for public release. Please use the original citation:

Keszthelyi, L.P., Huff, A.E., and Jaeger, W.L., 2021, Geologic map of the Athabasca Valles region, Mars: U.S. Geological Survey Scientific Investigations Map 3477, pamphlet 11 p., 1 sheet, scale 1:1,000,000, https://doi.org/10.3133/sim3477.

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Project specific datasets are projected (meters).
Projection: Mars Transverse Mercator
            Central meridian: 155.0
using the geographic coordinate system "Mars 2000"
Major and minor axes are 3396190.0 m
Also included is the *.prj file for the Mars 2000 Sphere GCS. They are all located in ...\CoordinateSystems.

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File geodatabase contains one feature dataset:
1.) Athabasca_MTM_clon155E
    a) FigureBoundaries_JAN2020 (polygon file)
    b) FigureLeaderLines_JAN2020 (polyline file)
    c) FigureLocations_JAN2020 (point file)
    d) FigureNumbers_JAN2020 (annotation file)
    e) GeoContacts_JAN2020 (polyline file)
    f) GeoContacts_YO_JAN2020 (annotation file)
    g) GeoLabels_JAN2020 (annotation file)
    h) GeoLabelsLeaderLines_JAN2020 (polyline file)
    i) GeoUnits_JAN2020 (polygon file)
    j) LinearFeatures_JAN2020 (polyline file)
    k) MapBoundary_JAN2020 (polygon file)
    l) Nomenclature_JAN2020 (annotation file)

These feature classes are grouped into ÒMapping LayersÓ in the ArcMap project. They are projected as MTM and should house all digitized map information.

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Raster layers are included in the folder ...\BaseMaps\, and include:
1.) MOLA128_hlshd_MTM_clon155E.tif
2.) MOLA128_MTM_clon155E.tif
3.) THEMIS_IR_daytime_MTM_clon155E.tif
4.) THEMIS_IR_nighttime_MTM_clon155E.tif

These feature classes are grouped into ÒRastersÓ in the ArcMap project.  They are projected as MTM.

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Symbols are applied to each of the included feature classes. These symbols are adapted from USGS Open-File Report 99Ð430 (Digital Cartographic Standard for Geologic Map Symbolization). These can be viewed and downloaded at http://pubs.usgs.gov/of/1999/of99-430/

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To add/remove symbols, open ArcMap project, right-click the feature class of interest, click ÒPropertiesÓ, and click ÒSymbologyÓ tab. Highlight the symbol to alter and then click ÒRemoveÓ or double-click to alter.  Each feature class has an associated *.lyr file that houses the symbologies.  Click ÒimportÓ on the ÒSymbologyÓ tab and navigate to the appropriate *.lyr to return to the full symbol list.

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We suggest that all work is contained within the *\Working folder. Create sub-folders as necessary to house relevant GIS data and map data.
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Comments are encouraged to assimilate beneficial GIS-based tools, datasets, and mapping approaches for future mappers.

Contact:

Trent Hare
thare@usgs.gov

Jim Skinner
jskinner@usgs.gov

Corey Fortezzo
cfortezzo@usgs.gov

Marc Hunter
mahunter@usgs.gov