tidy_nc: Set the time period and the geogprahical extension, as well...

In synoptReg: Synoptic Climate Classification and Spatial Regionalization of Environmental Data

Description

This function allows to subset the time series and geogprahical area of your atmospheric variable. In addition, even if no argument is given, the anomaly of the atmospheric variable/s will be computed. The anomaly value is provided in order to facilitate the visualization of the results after use the synoptclas function. It is mandatory to pass the tidy_nc even if you do not want to change the time period or the geographical extension.

Usage

tidy_nc(
  x,
  time_subset = NULL,
  geo_subset = NULL,
  monthly_subset = NULL,
  name_vars = NULL
)

Arguments

x	data.frame. A data.frame with the following variables: lon, lat, time, value. The same structure returned when using download_ncep.
time_subset	vector. Starting and ending date, or a vector of dates of interest.
geo_subset	vector. A vector providing the xmin,xmax,ymin,ymax.
monthly_subset	an integer or a vector of integers. Number of the month/s desired.
name_vars	character or a vector of characters. Name of the atmospheric variable/s. If name is not specified, then will be coded as integers.

Value

A data.frame with the following variables: lon, lat, time, value, anom_value

See Also

download_ncep

Examples

# Load data (mslp or precp_grid)
data(mslp)
data(z500)
# Tidying our atmospheric variables (500 hPa geopotential height
# and mean sea level pressure) together.

# Time subset between two dates
atm_data1 <- tidy_nc(x = list(mslp,z500), time_subset = c("2000-05-01","2001-04-30"))

# Time subset using a vector of dates of interest. Including a geographical crop
dates_int <- c("2000-01-25","2000-04-01","2000-07-14","2001-05-08","2002-12-20")
atm_data1 <- tidy_nc(x = list(mslp,z500),
                     time_subset = dates_int,
                     geo_subset = c(-20,10,30,50),
                     name_vars = c("mslp","z500")) # following the list sequence

synoptReg documentation built on April 22, 2021, 1:06 a.m.