ind_long_lat: Return or the index in ncdf object from lat/longitude or...

In HelpersMG: Tools for Environmental Analyses, Ecotoxicology and Various R Functions

Return or the index in ncdf object from lat/longitude or inverse

Description

Return or the index in ncdf object from lat/longitude or reverse.

Usage

ind_long_lat(
  ncdf = stop("The ncdf data must be supplied"),
  long = NULL,
  lat = NULL,
  indice.long = NULL,
  indice.lat = NULL,
  label.longitude = "lon",
  label.latitude = "lat"
)

Arguments

ncdf	An object read from package ncdf4, ncdf or RNetCDF
long	Longitude in decimal format
lat	Latitude in decimal format
indice.long	Index of longitude
indice.lat	Index of latitude
label.longitude	Name of argument for longitude, default is lon
label.latitude	Name of argument for latitude, default is lat

Details

ind_long_lat is used to manage ncdf information

Value

Or the index in ncdf object from lat/longitude or inverse

Author(s)

Marc Girondot [e-mail]

See Also

Other ncdf: format_ncdf()

Examples

## Not run: 
url <- "https://downloads.psl.noaa.gov/Datasets/noaa.oisst.v2.highres/"
url <- paste0(url, "sst.day.mean.2012.v2.nc")
dest <- paste(Sys.getenv("HOME"), "/sst.day.mean.2012.v2.nc", sep="")
download.file(url, dest)
library("ncdf4")
dta2012 <- nc_open(dest)
indices <- ind_long_lat(ncdf=dta2012, lat=5.89, long=-20.56)
coordinates <- ind_long_lat(ncdf=dta2012, indice.lat=20, indice.long=30)
# library("RNetCDF")
# dta2012 <- open.nc(dest)
# indices <- ind_long_lat(ncdf=dta2012, lat=5.89, long=-20.56)
# coordinates <- ind_long_lat(ncdf=dta2012, indice.lat=20, indice.long=30)
# ncdf library is depreciated in CRAN
# library("ncdf")
# dta2012 <- open.ncdf(dest)
# indices <- ind_long_lat(ncdf=dta2012, lat=5.89, long=-20.56)
# coordinates <- ind_long_lat(ncdf=dta2012, indice.lat=20, indice.long=30)

## End(Not run)

HelpersMG documentation built on Sept. 12, 2024, 9:35 a.m.