After additional columns(i.e. datetime, and monitorID)
have been applied to an EPA dataframe, we are ready to
extract the PM2.5 values and store them in a data dataframe
organized as time-by-monitor.
The first column of the returned dataframe is named datetime and
contains a POSIXct time in UTC. Additional columns contain data
for each separate monitorID.
epa_createDataDataframe(tbl)
| tbl | an EPA raw tibble after metadata enhancement |
|---|
A data dataframe for use in a ws_monitor object.