R: Get a NetCDF Attribute

att.get.nc {RNetCDF} | R Documentation

## Get a NetCDF Attribute

### Description

Get an attribute from a NetCDF dataset.

### Usage

    att.get.nc(ncfile, variable, attribute)

### Arguments

`ncfile` | Object of class "`NetCDF`" which points to the NetCDF dataset (as returned from `open.nc`).
`variable` | ID or name of the variable from which the attribute will be read, or `"NC_GLOBAL"` for a global attribute.
`attribute` | Attribute name or ID.

### Details

This function returns the value of the attribute.

### Value

A vector of type `character` if the on-disk type is `NC_CHAR`, otherwise `numeric`. No distinction is made between the different storage types of numeric objects.

### Note

`NC_BYTE` is always interpreted as signed.

### Author(s)

Pavel Michna

### References

http://www.unidata.ucar.edu/software/netcdf/

### Examples

    ##  Create a new NetCDF dataset and define two dimensions
    nc <- create.nc("att.get.nc")

    dim.def.nc(nc, "station", 5)
    dim.def.nc(nc, "time", unlim=TRUE)

    ##  Create two variables, one as coordinate variable
    var.def.nc(nc, "time", "NC_INT", "time")
    var.def.nc(nc, "temperature", "NC_DOUBLE", c(0,1))

    ##  Put some attributes
    att.put.nc(nc, "temperature", "missing_value", "NC_DOUBLE", -99999.9)
    att.put.nc(nc, "temperature", "long_name", "NC_CHAR", "air temperature")
    att.put.nc(nc, "NC_GLOBAL", "title", "NC_CHAR", "Data from Foo")
    att.put.nc(nc, "NC_GLOBAL", "history", "NC_CHAR", paste("Created on", date()))

    ##  Get these attributes
    att.get.nc(nc, "temperature", "missing_value")
    att.get.nc(nc, "temperature", "long_name")
    att.get.nc(nc, "NC_GLOBAL", "title")
    att.get.nc(nc, "NC_GLOBAL", "history")

    close.nc(nc)

[Package RNetCDF version 1.9-1 Index]