code: def validate_sceneInfo(self):
          
          if self.sceneInfo.prefix not in self.__satellitesMap:
              logger.error('Google Downloader: Prefix of %s (%s) is invalid'
                  % (self.sceneInfo.name, self.sceneInfo.prefix))
              raise WrongSceneNameError('Google Downloader: Prefix of %s (%s) is invalid'
                  % (self.sceneInfo.name, self.sceneInfo.prefix))
docs: Check scene name and whether remote file exists. Raises
          WrongSceneNameError if the scene name is wrong.