monitor_leaflet: Leaflet interactive map of monitor locations

In AirMonitor: Air Quality Data Analysis

Leaflet interactive map of monitor locations

Description

This function creates interactive maps that will be displayed in RStudio's 'Viewer' tab. The slice argument is used to collapse a mts_monitor timeseries into a single value. If slice is an integer, that row index will be selected from the monitor$data dataframe. If slice is a function (unquoted), that function will be applied to the timeseries with the argument na.rm=TRUE (e.g. max(..., na.rm=TRUE)).

If slice is a user defined function, it will be used with argument na.rm=TRUE to collapse the time dimension. Thus, user defined functions must accept na.rm as an argument.

Usage

monitor_leaflet(
  monitor,
  slice = "max",
  radius = 10,
  opacity = 0.7,
  maptype = "terrain",
  extraVars = NULL,
  jitter = 5e-04,
  NAAQS = c("PM2.5_2024", "PM2.5"),
  ...
)

Arguments

monitor	mts_monitor object.
slice	Either a formatted time string, a time index, the name of a (potentially user defined) function used to collapse the time axis.
radius	radius of monitor circles
opacity	opacity of monitor circles
maptype	optional name of leaflet ProviderTiles to use, e.g. "terrain"
extraVars	Character vector of additional column names from monitor$meta to be shown in leaflet popups.
jitter	Amount to use to slightly adjust locations so that multiple monitors at the same location can be seen. Use zero or NA to see precise locations.
NAAQS	Version of NAAQS levels to use. See Note.
...	Additional arguments passed to leaflet::addCircleMarker().

Details

The maptype argument is mapped onto leaflet "ProviderTile" names. Current map types include:

"roadmap"

– "OpenStreetMap"

"satellite"

– "Esri.WorldImagery"

"terrain"

– "Esri.WorldTopoMap"

"toner"

– "Stamen.Toner"

If a character string not listed above is provided, it will be used as the underlying map tile if available. See https://leaflet-extras.github.io/leaflet-providers/ for a list of "provider tiles" to use as the background map.

Value

Invisibly returns a leaflet map of class "leaflet".

Note

On February 7, 2024, EPA strengthened the National Ambient Air Quality Standards for Particulate Matter (PM NAAQS) to protect millions of Americans from harmful and costly health impacts, such as heart attacks and premature death. Particle or soot pollution is one of the most dangerous forms of air pollution, and an extensive body of science links it to a range of serious and sometimes deadly illnesses. EPA is setting the level of the primary (health-based) annual PM2.5 standard at 9.0 micrograms per cubic meter to provide increased public health protection, consistent with the available health science. See PM NAAQS update.

Examples

## Not run: 
library(AirMonitor)
# Fail gracefully if any resources are not available
try({

# Maximum AQI category at each site
monitor_loadLatest() %>%
  monitor_filter(stateCode %in% CONUS) %>%
  monitor_leaflet()

# Mean AQI category at each site
monitor_loadLatest() %>%
  monitor_filter(stateCode %in% CONUS) %>%
  monitor_leaflet(
    slice = "mean"
  )

# Mean AQI category at each site using the updated NAAQS
monitor_loadLatest() %>%
  monitor_filter(stateCode %in% CONUS) %>%
  monitor_leaflet(
    slice = "mean",
    NAAQS = "PM2.5_2024"
  )

}, silent = FALSE)

## End(Not run)

AirMonitor documentation built on Sept. 27, 2024, 9:06 a.m.