code: function(layer) {
  		return {
  			type: 'rectangle',
  			northEast: {
  				lat: layer.getBounds()._northEast.lat,
  				lng: layer.getBounds()._northEast.lng,
  			},
  			southWest: {
  				lat: layer.getBounds()._southWest.lat,
  				lng: layer.getBounds()._southWest.lng,
  			}
  		};
  	}
docs: Get the geo representation of the current filter box