Subset ws_monitor Object

Source: R/monitor_subset.R

Creates a subset ws_monitor based on one or more optional input parameters. If any input parameter is not specified, that parameter will not be used to subset ws_monitor.

monitor_subset(
  ws_monitor,
  xlim = NULL,
  ylim = NULL,
  tlim = NULL,
  vlim = NULL,
  monitorIDs = NULL,
  stateCodes = NULL,
  countryCodes = NULL,
  dropMonitors = TRUE,
  timezone = "UTC"
)

Arguments

ws_monitor

ws_monitor object
xlim

optional vector with low and high longitude limits
ylim

optional vector with low and high latitude limits
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 monitor IDs used to filter the data
stateCodes

optional vector of state codes used to filter the data
countryCodes

optional vector of country codes used to filter the data
dropMonitors

flag specifying whether to remove monitors with no data
timezone

Olson timezone passed to parseDatetime when parsing numeric tlim

Value

A ws_monitor object with a subset of ws_monitor.

Details

By default, this function will return a ws_monitor object whose data dataframe has the same number of columns as the incoming dataframe, unless any of the columns consist of all NAs, in which case such columns will be removed (e.g. if there are no valid data for a specific monitor after subsetting by tlim or vlim). If dropMonitors=FALSE, columns that consist of all NAs will be retained.

Examples

library(PWFSLSmoke)

N_M <- monitor_subset(Northwest_Megafires, tlim=c(20150701,20150731))
xlim <- c(-124.73, -122.80)
ylim <- c(47.20, 48.40)
Olympic_Peninsula <- monitor_subset(N_M, xlim, ylim)

monitor_map(Olympic_Peninsula, cex=2)

rect(xlim[1], ylim[1], xlim[2], ylim[2], col=adjustcolor('black',0.1))