layer1_old = vl.markPoint({'opacity': .8, 'strokeWidth':.5, "tooltip": {"content": "data"}})
.data(data_to_map)
.encode(
vl.latitude().fieldQ('lat'),
vl.longitude().fieldQ('lng'),
vl.color().field(groupby)
)
.project(vl.projection('albersUsa'))
.width(560)