code: def get_most_recent_images(self, results, types=[], sensors=[], N=1):
          ''' Return the most recent image
  
          Args:
              results: a catalog resultset, as returned from a search
              types: array of types you want. optional.
              sensors: array of sensornames. optional.
              N: number of recent images to return.  defaults to 1.
  
          Returns:
              single catalog item, or none if not found
  
          '''
          if not len(results):
              return None
  
          # filter on type
          if types:
              results = [r for r in results if r['type'] in types]
  
          # filter on sensor
          if sensors:
              results = [r for r in results if r['properties'].get('sensorPlatformName') in sensors]
  
  
          # sort by date:
          #sorted(results, key=results.__getitem__('properties').get('timestamp'))
          newlist = sorted(results, key=lambda k: k['properties'].get('timestamp'), reverse=True)
          return newlist[:Nf get_most_recent_images(self, results, types=[], sensors=[], N=1):
          ''' Return the most recent image
  
          Args:
              results: a catalog resultset, as returned from a search
              types: array of types you want. optional.
              sensors: array of sensornames. optional.
              N: number of recent images to return.  defaults to 1.
  
          Returns:
              single catalog item, or none if not found
  
          '''
          if not len(results):
              return None
  
          # filter on type
          if types:
              results = [r for r in results if r['type'] in types]
  
          # filter on sensor
          if sensors:
              results = [r for r in results if r['properties'].get('sensorPlatformName') in sensors]
  
  
          # sort by date:
          #sorted(results, key=results.__getitem__('properties').get('timestamp'))
          newlist = sorted(results, key=lambda k: k['properties'].get('timestamp'), reverse=True)
          return newlist[:N]
docs: Return the most recent image
  
          Args:
              results: a catalog resultset, as returned from a search
              types: array of types you want. optional.
              sensors: array of sensornames. optional.
              N: number of recent images to return.  defaults to 1.
  
          Returns:
              single catalog item, or none if not found