NASA Photo ID: S91-50684           File Name: 10063356.jpg
  Film Type: 4x5                     Date Taken: 11/07/91
  Title: Global view of Venus from Magellan, Pioneer, and Venera data
  Description:
  Global view of Venus is created from Magellan, Pioneer, and Venera data. 
  The  northern hemisphere of Venus is displayed in this global view of
  Venus'  surface.  The north pole is at the center of the image. Zero
  degrees, 90  degrees, 180 degrees, and 270 degrees east longitude are at
  the 6, 3, 12, and  9 o'clock positions, respectively, of an imaginary clock
  face.  Magellan  synthetic aperture radar mosaics from the first cycle of
  Magellan mapping are  mapped onto a computer-simulated globe to create this
  image.  Data gaps are  filled with Pioneer-Venus orbiter data, or a
  constant mid-range value.   Simulated color is used to enhance small-scale
  structure.  The simulated hues  are based on color images recorded by the
  Soviet Venera 13 and 14 spacecraft.  The image was produced at the Jet
  Propulsion Laboratory (JPL) Multimission  Image Processing Laboratory and
  is a single frame from a video released at  the JPL news conference,
  10-29-91.         
  Subject terms:
  LANDFORMS                               
  MAGELLAN SPACECRAFT (NASA)              
  MOSAICS                                 
  PIONEER VENUS SPACECRAFT                
  RADAR DATA                              
  VENERA SPACECRAFT                       
  VENUS SURFACE                           
  VOLCANOES                               
  

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