topRight = map.project(L.latLng(changeset.bbox.maxlat, changeset.bbox.maxlon)),
width = topRight.x - bottomLeft.x,
height = bottomLeft.y - topRight.y,
topRight = map.project(L.latLng(changeset.bbox.maxlat, changeset.bbox.maxlon)),
width = topRight.x - bottomLeft.x,
height = bottomLeft.y - topRight.y,