code: def _get_platform(self):
          
          try:
              return PLATFORMS[self.projection_name]
          except KeyError:
              logger.error('Unable to determine platform: Unknown projection '
                           'name "{}"'.format(self.projection_name))
              return UNKNOWN_PLATFORM
docs: Get the platform name
  
          The platform is not specified explicitly in JMA HRIT files. For
          segmented data it is not even specified in the filename. But it
          can be derived indirectly from the projection name:
  
              GEOS(140.00): MTSAT-1R
              GEOS(140.25): MTSAT-1R    # TODO: Check if there is more...
              GEOS(140.70): Himawari-8
              GEOS(145.00): MTSAT-2
  
          See [MTSAT], section 3.1. Unfortunately Himawari-8 and 9 are not
          distinguishable using that method at the moment. From [HIMAWARI]:
  
          "HRIT/LRIT files have the same file naming convention in the same
          format in Himawari-8 and Himawari-9, so there is no particular
          difference."
  
          TODO: Find another way to distinguish Himawari-8 and 9.
  
          References:
          [MTSAT] http://www.data.jma.go.jp/mscweb/notice/Himawari7_e.html
          [HIMAWARI] http://www.data.jma.go.jp/mscweb/en/himawari89/space_segment/sample_hrit.html