Mars Express data workshop 21-23 May 2008: HRSC & OMEGA Washington University in St. Louis Surface dating using Craterstats program Greg Michael Planetology.

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Presentation transcript:

Mars Express data workshop May 2008: HRSC & OMEGA Washington University in St. Louis Surface dating using Craterstats program Greg Michael Planetology and Remote Sensing Institute of Geosciences Freie Universitaet Berlin

2 Craterstats software - dating Production function – constant size-frequency distribution Chronology function – changing rate (constant back to 3 Ga, then exponentially increasing) Diameter range Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

3 Import, bin and plot crater counts Fit a production function Obtain an age from a chronology function Plot isochrons Apply resurfacing correction Export graphic Detailed instructions: Craterstats software - overview Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

4 Craterstats software – data #Model.diam file for Craterstats # Area = # #diameter, km area diameters binning (Neukum’s pseudo-log bins, Hartmann’s root-2 bins, unbinned) error bars Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

5 Craterstats software – resurfacing events Distribution falls below PF Simple fit in error because of excess in larger diameter range Slope appears shallower Find excess by fitting slope Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

6 Craterstats software – resurfacing events Distribution falls below PF Simple fit in error because of excess in larger diameter range Slope appears shallower Find excess by fitting slope Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

7 Craterstats software – resurfacing events Distribution falls below PF Simple fit in error because of excess in larger diameter range Slope appears shallower Find excess by fitting slope Obtain age from chronology function in the usual way Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008

8 Craterstats software – sample measurement Start - Download from: On Windows, double-click craterstats.sav; on linux: type idl -vm=craterstats.sav Make cumulative histogram plot - Use pre-binned count (Echus Chasma, Mary Chapman): - sample/ECHUS_CHAP_AR1_A.stat - Select the source file for the count using the ‘Browse…’ button - Set the axis ranges Make first fit - Duplicate first plot (File-duplicate), and change plot-type to ‘fit’ - Choose production function - Select fit range - Options: age, error bars, isochron Make 2 nd fit (younger part) - Duplicate previous plot - Modify fit range - Hide plot Make resurfacing correction - Duplicate first plot - Change colour/symbol - Modify diameter range - Enter minimum fitting diameter for correction - Check ‘resurfacing correction’ box Make fit to corrected points - Duplicate previous plot - Change plot type to ‘fit’ - Set minimum diameter equal to the ‘minimum fitting diameter’ - Display age/isochron - Option: align left Export graphic - Export image as.png file, or as postscript - Save composite plot (File-Save…) - Examine.plt and.txt output files (both ASCII) Mars Express HRSC/OMEGA data workshop, St. Louis, May 2008