scene_id lookup table fix and warning on unknown

basically this will warn for anything but HSD FLDK scenes currently

himawari/ahi2cmi.py

@@ -38,7 +38,7 @@ AHI_BIT_DEPTH = dict(zip(range(1,17), [11, 11, 11, 11,
                                        12, 12, 12, 11]))
 
 SCENE_ID_CONVERSION = {
-    "FLDK": "Full Disk",
+    "FLD": "Full Disk",
 }
 
 class HimawariAHIasCMIP(object):
@@ -304,9 +304,12 @@ class HimawariAHIasCMIP(object):
 
     @property
     def scene_id(self):
-        LOG.warning("FIXME scene_id is hard coded")
-        return "Full Disk"
-        # return SCENE_ID_CONVERSION.get(self._hs.observation_area, self._hs.observation_area)
+        oa = self._hs.observation_area
+        sid = SCENE_ID_CONVERSION.get(oa, None)
+        if sid is None:
+            LOG.warning("unable to find GOES-R scene id for observation area {}".format(repr(oa)))
+            return oa
+        return sid
 
     @property
     def central_wavelength(self):