Merge pull request #874 from TAlonglong/feature-correct-mersi2-invali…

…d-valid-range

Hardcoding of mersi2 l1b reader valid_range for channel 24 and 25 as these are wrong in the HDF data

satpy/readers/mersi2_l1b.py

@@ -100,6 +100,10 @@ def get_dataset(self, dataset_id, ds_info):
         else:
             new_fill = np.nan
         if valid_range is not None:
+            # Due to a bug in the valid_range upper limit in the 10.8(24) and 12.0(25)
+            # in the HDF data, this is hardcoded here.
+            if dataset_id.name in ['24', '25'] and valid_range[1] == 4095:
+                valid_range[1] = 25000
             # typically bad_values == 65535, saturated == 65534
             # dead detector == 65533
             data = data.where((data >= valid_range[0]) &