code: def cmd_alt(self, args):
          '''show altitude'''
          print("Altitude:  %.1f" % self.status.altitude)
          qnh_pressure = self.get_mav_param('AFS_QNH_PRESSURE', None)
          if qnh_pressure is not None and qnh_pressure > 0:
              ground_temp = self.get_mav_param('GND_TEMP', 21)
              pressure = self.master.field('SCALED_PRESSURE', 'press_abs', 0)
              qnh_alt = self.altitude_difference(qnh_pressure, pressure, ground_temp)
              print("QNH Alt: %u meters %u feet for QNH pressure %.1f" % (qnh_alt, qnh_alt*3.2808, qnh_pressure))
          print("QNH Estimate: %.1f millibars" % self.qnh_estimate()f cmd_alt(self, args):
          '''show altitude'''
          print("Altitude:  %.1f" % self.status.altitude)
          qnh_pressure = self.get_mav_param('AFS_QNH_PRESSURE', None)
          if qnh_pressure is not None and qnh_pressure > 0:
              ground_temp = self.get_mav_param('GND_TEMP', 21)
              pressure = self.master.field('SCALED_PRESSURE', 'press_abs', 0)
              qnh_alt = self.altitude_difference(qnh_pressure, pressure, ground_temp)
              print("QNH Alt: %u meters %u feet for QNH pressure %.1f" % (qnh_alt, qnh_alt*3.2808, qnh_pressure))
          print("QNH Estimate: %.1f millibars" % self.qnh_estimate())
docs: show altitude