{'field': 'Lat', 'type': 'quantitative'}
{'field': 'Long', 'type': 'quantitative'}
{'field': 'region', 'type': 'nominal'}
{'field': 'USMapID', 'type': 'nominal'}
{'field': 'death', 'type': 'quantitative'}
{'field': 'confirmed', 'type': 'quantitative'}
{'field': 'date', 'type': 'temporal'}
Generate 16 vis, time last 1.483 s.

Cost:62.697

Cost:62.697

Cost:62.720

Cost:62.720

Cost:63.665

Cost:63.665

Cost:63.700

Cost:63.700

Cost:63.700

Cost:63.700

Cost:63.735

Cost:63.735

Cost:64.190

Cost:64.190

Cost:64.213

Cost:64.213