monitor_subsetData: Subset ws_monitor Object 'data' Dataframe

In PWFSLSmoke: Utilities for Working with Air Quality Monitoring Data

Description

Subsets a ws_monitor object's data dataframe by removing any monitors that lie outisde the specified ranges of time and values and that are not mentioned in the list of monitorIDs.

If tlim or vlim is not specified, it will not be used in the subsetting.

Intended for use by the monitor_subset function.

Usage

monitor_subsetData(
  data,
  tlim = NULL,
  vlim = NULL,
  monitorIDs = NULL,
  dropMonitors = FALSE,
  timezone = "UTC"
)

Arguments

data	ws_monitor object data dataframe
tlim	optional vector with start and end times (integer or character representing YYYYMMDD[HH] or POSIXct)
vlim	optional vector with low and high data value limits
monitorIDs	optional vector of monitorIDs
dropMonitors	flag specifying whether to remove columns – defaults to FALSE
timezone	Olson timezone passed to parseDatetime when parsing numeric tlim

Details

By default, filtering by tlim or vlim will always return a dataframe with the same number of columns as the incoming dataframe. If dropMonitors=TRUE, columns will be removed if there are not valid data for a specific monitor after subsetting.

Filtering by vlim is open on the left and closed on the right, i.e.

x > vlim[1] & x <= vlim[2]

Value

A ws_monitor object data dataframe, or NULL if filtering removes all monitors.

PWFSLSmoke documentation built on Nov. 23, 2021, 5:06 p.m.