                          THEMIS: Image Detail

                                                                        
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    Processes of Geology                                                
   (Released 16 July 2003)                                              
                                                                        
  [9] Image Context:                                                    
                                                                        
  Context image credit:                                                 
  NASA/Mars Orbiter Laser                                               
  Altimeter (MOLA) Team                                                 
  [ Find on map:                                                        
  Javascript [10]  version                                              
  ]                                                                     
  [ Find on map: CGI [11]                                               
  version ]                                                             
                                                                        
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  This THEMIS visible                                                   
  image captures a complex                                              
  process of deposition,                                                
  burial and exhumation.                                                
  The crater ejecta in the                                              
  top of the image is in                                                
  the form of flow lobes,                                               
  indicating that the                                                   
  crater was formed in                                                  
  volatile-rich terrain.                                                
  While a radial pattern                                                
  can be seen in the                                                    
  ejecta, the pattern is                                                
  sharper in the lower                                                  
  half of the ejecta. This                                              
  is because the top half                                               
  of the ejecta is still                                                
  buried by a thin layer                                                
  of sediment. It is most                                               
  likely that at one time                                               
  the entire area was                                                   
  covered. Wind, and                                                    
  perhaps water erosion                                                 
  have started to remove                                                
  this layer, once again                                                
  exposing the what was                                                 
  present underneath.                                                   
                                                                        
  [Questions? Email                                                     
  images@themis.asu.edu                                                 
  [12] ]                                                                
                                                                        
  [Source: ASU THEMIS                                                   
  Science Team]                                                         
                                                                        
  Note: this THEMIS visual                                              
  image has not been                                                    
  radiometrically nor                                                   
  geometrically calibrated                                              
  for this preliminary                                                  
  release. An empirical                                                 
  correction has been                                                   
  performed to remove                                                   
  instrumental effects. A                                               
  linear shift has been                                                 
  applied in the                                                        
  cross-track and                                                       
  down-track direction to                                               
  approximate spacecraft                                                
  and planetary motion.                                                 
  Fully calibrated and                                                  
  geometrically projected                                               
  images will be released                                               
  through the Planetary                                                 
  Data System in                                                        
  accordance with Project                                               
  policies at a later                                                   
  time.                                                                 
                                                                        
  NASA's Jet Propulsion                                                 
  Laboratory manages the                                                
  2001 Mars Odyssey                                                     
  mission for NASA's                                                    
  Office of Space Science,                                              
  Washington, D.C. The                                                  
  Thermal Emission Imaging                                              
  System (THEMIS) was                                                   
  developed by Arizona                                                  
  State University, Tempe,                                              
  in collaboration with                                                 
  Raytheon Santa Barbara                                                
  Remote Sensing. The                                                   
  THEMIS investigation is                                               
  led by Dr. Philip                                                     
  Christensen at Arizona                                                
  State University.                                                     
  Lockheed Martin                                                       
  Astronautics, Denver, is                                              
  the prime contractor for                                              
  the Odyssey project, and                                              
  developed and built the                                               
  orbiter. Mission                                                      
  operations are conducted                                              
  jointly from Lockheed                                                 
  Martin and from JPL, a                                                
  division of the                                                       
  California Institute of                                               
  Technology in Pasadena.                                               
                                                                        
  Image Credit:                                                         
  NASA/JPL/Arizona State                                                
  University                                                            
                                                                        
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    Full-Size Image (TIF)                                               
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     [ Printer-friendly                                                 
       version [17]  ]                                                  
                                                                        
                  Parameter   Value              Parameter   Value      
                                                                        
                   Latitude   -34.3             Instrument   VIS        
                                                                        
                  Longitude   181.2E            Resolution   19         
                              (178.8W)                 (m)              
                                                                        
        Image Size (pixels)   3061x1198         Image Size   58.2x22.8  
                                                      (km)              
                                                                        
                                [18]  [19]                              
                                                                        
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