{'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 20 vis, time last 1.710 s.
Cost:18.110
Cost:18.200
Cost:18.210
Cost:18.210
Cost:18.220
Cost:18.220
Cost:18.730
Cost:18.730
Cost:18.820
Cost:18.820
Cost:18.830
Cost:18.830
Cost:18.840
Cost:18.840
Cost:28.130
Cost:28.130
Cost:28.140
Cost:28.140
Cost:28.150
Cost:28.150