DESCRIPTION OF THE DIGITAL DATABASE FOR 
  Geologic Map of Tooting Crater, Amazonis Planitia region of Mars
  USGS SCIENTIFIC INVESTIGATIONS MAP 3297

  Reference: Peter J. Mouginis-Mark, 2015, Geologic Map of Tooting Crater, Amazonis Planitia Region of Mars: U.S. Geological Survey
  Scientific Investigations Map 3297, scale 1:200,000, available at http://pubs.usgs.gov/sim/3297/ or http://dx.doi.org/10.3133/sim3297

  INTRODUCTION

This represents a digital geologic map for Tooting crater on Mars. Tooting crater has a diameter of
27.2 km, and formed on virtually flat lava flows within Amazonis Planitia ~1,300 km west of the 
summit of Olympus Mons volcano, where there  appears to have been no other major topographic features 
prior to the impact. The crater formed in an area ~185 x 135 km in size that is at an elevation 
between -3,870 m and -3,874 m relative to the Mars Orbiter Laser Altimeter (MOLA) Mars datum. This
fortuitous situation (i.e., a bland, horizontal target) allows the geometry of the crater and the
thickness of the ejecta blanket to be accurately determined by subtracting the appropriate elevation
of the surrounding landscape (-3,872 m) from the individual MOLA measurements across the crater. 
Thus, for the first time, it is possible to determine the radial decrease of ejecta thickness as a 
function of distance away from the rim crest. On the basis of the four discrete ejecta layers 
surrounding the crater cavity, Tooting crater is classified as a Multiple-Layered Ejecta (MLE) crater.
   
  All GIS data are in Transverse_Mercator projection using the
  Mars 2000 geographic coordinate system
  (GCS_Mars_2000_Sphere, 3396190.0 radius). Units are in meters.
  Scale Factor = 1.0
  Center Longitude = -150.0
  Standard Parrallel (Center Lat) = 0.0

  GEOLOGIC CONTENT (contents of "ESRI_FileGeodatabase" Folder,
  SIM3297_TootingCrater_200K.gdb)

  This ArcGIS geodatabase contains one feature dataset
  (SIM3297_feature_dataset) with the following features:

  SIM3297_GeoContacts - Line feature class, geologic unit and map
  boundaries including symbol types: certain, approximate, facies.

  SIM3297_GeoUnits - Polygon feature class, geologic unit polygon
  feature class.  Contains a "Unit_type" field denoting the unit symbol.

  SIM3297_LinearFeatures - Line feature class, denoting structural features.

  SIM3297_facies - Crater ejecta facies

  SIM3297_LocationFeatures - Secondary craters and secondary buried craters  
  
  SIM3297_SurfaceFeatures - Secondary crater fields

  BASE MAP CONTENT
The primary data set used for the mapping came from the Thermal Emission Imaging System (THEMIS) 
visible (VIS) camera. THEMIS VIS data at 18 m/pixel cover almost all of the mapped area, with
only a few data gaps which were filled with THEMIS infrared (IR) data with 100 m/pixel resolution. 

  DIGITAL DATABASE AND METADATA PACKAGE (SIM3297_database.zip)

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

  "SIM_3297_GIS" directory
  --------------------------------------------
   Files                     Description
  ---------------------------------------------------------------------
  ---------------------------------------------------------------------

  SIM3297_README.txt         This readme file.

  SIM3297_metadata.txt       Text-format FGDC-style metadata for the
                             database package

  SIM3297_metadata.xml       XML-format FGDC-style metadata for the
                             database package

  SIM3297_ArcMap10.mxd       ArcGIS (version 10) project for the database package


  "Rasters" basemap directory
  --------------------------------------------
  Tooting_controlled2_MTM.jp2 - THEMIS Vis basemap controlled to MOLA by ASU and Hawaii Univ.
  

  "ESRI_FileGeodatabase" directory
  --------------------------------------------
  "SIM3297_TootingCrater_200K.gdb" - ArcMap 9.3 versioned geodatabase

  "ESRI_Shapefiles" -
    --------------------------------------------
  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.

  Users of the database package may wish to download the PDF version
  of the map for the Description of Map Units.

  The material described above is available on the World Wide Web at
  http:/pubs.usgs.gov/sim/3297/ or http:/dx.doi.org/10.3133/sim3297

  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 v 10, a
  commercial Geographic Information System produced by Environmental
  Systems Research Institute, Redlands, California.

  OBTAINING HARD-COPY OF SIM 3297

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

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