code: def parseFilename(self, filename):
          
          match = self.filename_regex.match(filename)
          if match is None:
              # TODO?: Raise exception?
              '''print("Filename", filename, "unrecognized!")'''
              return None
          lat = int(match.group(2))
          lon = int(match.group(4))
          if match.group(1) == "S":
              lat = -lat
          if match.group(3) == "W":
              lon = -lon
          return lat, lon
docs: Get lat/lon values from filename.