Change name to be more readable

sohstationviewer/model/mseed/mseed.py

@@ -380,13 +380,13 @@ class MSeed(DataTypeModel):
         # Start pass the end of the string and look backward one
         # index every iteration so we don't have to add 1 to the
         # final index.
-        i = len(height_str)
-        current_char = height_str[i - 1]
+        current_idx = len(height_str)
+        current_char = height_str[current_idx - 1]
         while current_char != '.' and not current_char.isnumeric():
-            i -= 1
-            current_char = height_str[i - 1]
-        height = float(height_str[:i])
-        height_unit = height_str[i:]
+            current_idx -= 1
+            current_char = height_str[current_idx - 1]
+        height = float(height_str[:current_idx])
+        height_unit = height_str[current_idx:]
 
         # Latitude and longitude are encoded in the format
         # <degree><decimal minute><cardinal direction>. For