code: def set_ground_width(self, ground_width):
          '''set ground width of view'''
          state = self.state
          state.ground_width = ground_width
          state.panel.re_center(state.width/2, state.height/2, state.lat, state.lonf set_ground_width(self, ground_width):
          '''set ground width of view'''
          state = self.state
          state.ground_width = ground_width
          state.panel.re_center(state.width/2, state.height/2, state.lat, state.lon)
docs: set ground width of view