exercise California chloropleth example

[jonathancallahan]

GOAL -- create compelling chloropleth maps using AirSensor data

I have added a new example in local_examples/2020_California_AirSensor_chloropleth.R.

It requires the AirSensor package which can be installed with:

devtools::install_github("MazamaScience/AirSensor")

The goal of this task to explore the data, modifying the chosen DATE and SPATIAL_DATASET and come up with some compelling visualizations.

The current example allows modifying the date but hardcodes USCensusCounties. This is a reasonable place to start exploring.

Tasks include:

• post issues if something seems awkward or missing or wrong with summarizeByPolygon()
• generate top 5 favorite base plot examples using the counties dataset
• create a test function that can generate the chloropleth map directly given the following parameters: SPDF, data data frame with "longitude, latitude, ..."; varName name of variable to summarize by
• find and convert one or more localized SPDFs in the Bay Area or LA basin and try them out, generating your top 5 favorite examples