  DESCRIPTION OF THE DIGITAL DATABASE FOR GEOLOGIC MAP OF
  THE MTM 85200 QUADRANGLE, OLYMPIA RUPES REGION OF MARS
  U.S. GEOLOGICAL SURVEY SCIENTIFIC INVESTIGATIONS MAP 3197

  INTRODUCTION

  This digital database for the Geologic Map of the MTM
  85200 quadrangle, Olympia Rupes Region, Mars includes
  multiple GIS features that collectively present the
  entire content of the geologic map, along with supporting
  files and metadata.  Data is in shapefile and ArcGIS
  geodatabase format, including attribute domains, and is
  collated within a single feature dataset that preserves
  the relevant geographic information. Together with the
  geologic map, the GIS database provides georeferenced
  information on the geologic units, structure, and
  morphology of the MTM 85200 quadrangle.  

  All GIS data are in Stereographic projection using the
  Mars 2000 polar sphere geographic coordinate system
  (GCS_Mars_2000_Sphere_Polar).  Units are in meters.

  GEOLOGIC CONTENT

  This ArGIS geodatabase contains one feature dataset with
  the following features as geologic content:

  CrossSection_endpoints - Origin and termination of two
  geologic cross-sections, used to annotate each, as a
  point feature class.  Contains an "Endpoint_id" field
  denoting the cross-section number and origin and/or
  termination.

  CrossSection_locations - Locations of the two cross-
  sections located within the quadrangle as a polyline
  feature class. Contains a "Section_no" field denoting the
  cross-section number.

  MTM85200_annotation - Unit symbols and leader lines as an
  annotation feature class.

  MTM85200_boundary - Quadrangle boundary as a polygon
  feature class.

  MTM85200_figure_locations - Locations of figures included
  on the geologic map as a polygon feature class.  Contains
  a "Figure" field denoting the figure number.

  MTM85200_geocontacts - Final geologic contact polyline
  feature class.  Contains a "Type" field denoting the type
  of geologic contact.

  MTM85200_geounits - Final geologic unit polygon feature
  class.  Contains a "UName" field denoting the unit name,
  a "USymbol" field denoting the unit symbol, a "UQueried"
  field denoting whether the unit is tagged as
  questionable, and a "Sph_Area" field containing the area
  of each polygon, as calculated using the spheroid.

  MTM85200_nomenclature - Annotation feature class showing
  the location and extent of approved planetary
  nomenclature for features located wholly or partly within
  the quadrangle boundary.

  MTM85200_point_features - Final location landforms as a
  point feature class.  Contains a "Type" field denoting
  the type of location landform, a "Strike" field denoting
  the 0-360 degree direction of the landform (as needed),
  and a "Reference" field denoting an instrument and image
  number that depicts the location landform.

  BASE MAP CONTENT

  The primary base for this geologic map consisted of a 
  "blended" product created by overlaying a time-controlled
  mosaic of Viking Oribiter images (acquired during 1976
  Martian northern summer) at and the Mars Orbiter Laser
  Altimeter (MOLA) gridded elevation. This base map served
  as the primary discriminator of discrete geologic unit
  boundaries as the means to characterize their appearance,
  morphology, and spatial distribution.  The base map was
  provided by USGS Astrogeology Science Center as a 8-bit
  raster image in Stereographic projection using the Mars"
  2000 polar sphere geographic coordinate system
  (GCS_Mars_2000_Sphere_Polar).  Supplemental information
  used in the identification and description of geologic
  units and features included MOLA-derived products (cell-
  to-cell slope, aspect, and color-shaded relief maps), a
  Context (CTX) camera image mosaic, and the full range of
  Thermal Emission Imaging System (THEMIS), Mars Orbiter
  Camera (MOC), High Resolution Imaging Science Experiment
  (HiRISE), and CTX images via web-linked image footprints
  within the project GIS.

  These data are available for download at: 

       http://ode.rsl.wustl.edu/mars
       
  DIGITAL DATABASE AND METADATA PACKAGE
  (SIM3197_database.zip)

  The geologic map files, basemap, and supportive files are
  included in the database package, as described below:

  File                          Description
  ---------------------------------------------------------

  SIM3197_readme.txt          This readme file.

  SIM3197_MTM85200_500K.gdb   ArcGIS geodatabase containing
                              all digital geologic map
                              information

  SIM3197_metadata.txt        Text-format FGDC-style
                              metadata for the database
                              package

  SIM3197_metadata.xml        XML-format FGDC-style
                              metadata for the database
                              package

  SIM3197_MTM85200.mxd        ArcGIS project for the
                              database package


  "BaseMaps" directory
  ---------------------------------------------------------

  mola_115mpx.tif             TIFF-format MOLA elevation
                              data

  mola_115mpx.tfw             World file that locates MOLA
                              elevation data

  mola_115mpx_hlshd.tif       TIFF-format MOLA-derived
                              topographic hillshade
  
  mola_115mpx_hlshd.tfw       World file that locates MOLA-
                              derived topographic hillshade

  mola_viking_merge.tif       TIFF-format "blended'
                              topography and image base map

  mola_viking_merge.tfw       World file that locates the
                             "blended" base map

  viking_50mpx.tif            TIFF-format Viking Orbiter
                              image mosaic

  viking_50mpx.tfw            World file that locates
                              Viking Orbiter image mosiac


  "LayerFiles" directory
  ---------------------------------------------------------

  MTM85200_geocontacts.lyr    ArcGIS layer file containing
                              contact symbol look-up table
 
  MTM85200_geounits.lyr       ArcGIS layer file containing
                              unit color look-up table

  MTM85200_point_features.lyr   ArcGIS layer file
                                containing location feature
                                symbol look-up table

  MTM85200_structure.lyr      ArcGIS layer file containing
                              structure symbol look-up
                              table


  "Shapefiles" directory
  ---------------------------------------------------------

  This directory contains GIS shapefiles exported from the
  ArcGIS geodatabase described above. As such, the names
  and  descriptions for each shapefile are identical to the
  content of the included geodatabase.  See above "GEOLOGIC
  CONTENT" for details.


  "SupplementalData" directory
  ---------------------------------------------------------

  ctx_6mpx.jp2             JPEG2000-format CTX image mosaic

  ctx_6mpx.j2w             World file that locates CTX
                           image mosaic 

  mola_115mpx_aspect.tif   TIFF-format MOLA-derived aspect
                           (slope direction) map

  mola_115mpx_aspect.tfw   World file that locates MOLA-
                           derived aspect map

  mola_115mpx_slope.tif    TIFF-format MOLA-derived cell-
                           to-cell slope map

  mola_115mpx_slope.tfw    World file that locates MOLA-
                           derived slope map


  Users of the database package may wish to download the
  technical and/or nontechnical pamphlet
  (sim3197_technical.pdf) for the contained Description of
  Map Units.

  The material described above is available on the World
  Wide Web at http:/pubs.usgs.gov/sim/3197/.

  ZIP FILES

  The files described above are packaged within a ZIP file.
  Utilities to uncompress ZIP files are available for most
  operating systems and may be found readily with a simple
  web search.

  DIGITAL DATABASE FORMAT

  The digital information compiled in this report used
  ArcGIS v 9.3 and v 10, a commercial Geographic
  Information System produced by Environmental Systems
  Research Institute, Redlands, California.

  OBTAINING HARD-COPY OF SIM 3197

  USGS Information Services
  Box 25286
  Denver Federal Center
  Denver, CO  80225-0046

  (303) 202-4200
  1-888-ASK-USGS
  Email: infoservices@usgs.gov

  World Wide Web: http://www.usgs.gov/pubprod

  ACKOWLEDGMENTS

  We thank Eric Kolb and Corey Fortezzo for technical map
  reviews.





