Update to take orbital_slot position from input files

gridded_glm/libexec/gridded_glm/_minute_gridder.py

@@ -66,7 +66,7 @@ warnings.filterwarnings("ignore")
 import dask
 dask.config.set(num_workers=1)
 
-GOES_SAT_POSITIONS={'G16': 'east', 'G17': 'west', 'G18': 'west', 'G19': 'east',}
+GOES_SUPPORTED_SATS=['G16', 'G17', 'G18', 'G19']
 
 
 def create_parser():
@@ -121,16 +121,19 @@ def get_resolution(args):
     return resln
 
 
-# if provided "auto" position, we determine the sensor from the filename
-def get_goes_position(filenames):
+def get_goes_position(files):
+  
+    position=""
+#Check that all files are the same position
+    for file in files:
+        new_position = Dataset(file, 'r').getncattr('orbital_slot')
+        if not position:
+            position=new_position
+        if not new_position == position:
+            raise ValueError("Input files contain a mix of positions. Check them and try again.")
+    position=position.split('-')[1]  
+    return position.lower()
 
-#Check that all files are the same sat
-    for key, value in GOES_SAT_POSITIONS.items():
-        if all(f"_{key}_" in f for f in filenames):
-            return value
-
-    # we require that all files are from the same sensor and raise an exception if not
-    raise ValueError("could not determine GOES position - did you provide a mix of satellites?")
 
 def glm_filename_to_minute(glm_filename):
     glminfo = parse_glm_filename(os.path.basename(glm_filename))