hourly: Calculate hourly mean, min or max

In eva3dm: Evaluation of 3D Meteorological and Air Quality Models

Calculate hourly mean, min or max

Description

function to calculate Ozone Maximum Daily 8-hr Average or 8-hr moving Average for a data.frame

Usage

hourly(
  data,
  time = "date",
  var,
  stat = mean,
  min_offset = 30,
  numerical = TRUE,
  verbose = TRUE
)

Arguments

data	data.frame with time column and variable columns to be processed
time	name of the time column (default is date) in POSIXct
var	name of the columns to be calculated
stat	function of the statistics to calculate (default is mean)
min_offset	minutes of observation from previous hour (default is 30)
numerical	TRUE (default) includes only numerical columns
verbose	display additional information

Value

data.frame including only numerical columns

data.frame with time and the hourly mean, min or max

Examples

# in case there is connection issue
load_data <- function(cond) {
  message(paste("conection issue, loading pre-downloaded data"))
  DATA <- readRDS(paste0(system.file("extdata",package="eva3dm"),
                         "/riem_OAHR_jan_2012.Rds"))
  return(DATA)
}

sites <- c("OAHR")
for(site in sites){
  cat('Trying to download METAR from:',site,'...\n')
  DATA <- tryCatch(riem::riem_measures(station    = sites,
                                       date_start = "2012-01-01",
                                       date_end   = "2012-02-01"),
                   error = load_data)
}
data_hourly_mean <- hourly(DATA,time = 'valid')
data_hourly_min  <- hourly(DATA[1:7],time = 'valid',stat = min)
data_hourly_max  <- hourly(DATA[1:7],time = 'valid',stat = max)

eva3dm documentation built on June 8, 2025, 10:44 a.m.