Get a NetCDF Attribute
Get an attribute from a NetCDF dataset.
att.get.nc(ncfile, variable, attribute, rawchar=FALSE, fitnum=FALSE)
ncfile |
Object of class " |
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variable |
ID or name of the variable from which the attribute will be read, or |
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attribute |
Attribute name or ID. |
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rawchar |
This option only relates to NetCDF attributes of type |
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fitnum |
By default, all numeric variables are read into R as double precision values. When
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This function returns the value of the attribute.
Vector with a data type that depends on the NetCDF variable. For NetCDF variables of type NC_CHAR, the R type is either character or raw, as specified by argument rawchar. For NC_STRING, the R type is character. Numeric variables are read as double precision by default, but the smallest R type that exactly represents each external type is used if fitnum is TRUE.
NC_BYTE is always interpreted as signed.
Pavel Michna, Milton Woods
## Create a new NetCDF dataset and define two dimensions
file1 <- tempfile("att.get_", fileext=".nc")
nc <- create.nc(file1)
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", "_FillValue", "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", "_FillValue")
att.get.nc(nc, "temperature", "long_name")
att.get.nc(nc, "NC_GLOBAL", "title")
att.get.nc(nc, "NC_GLOBAL", "history")
close.nc(nc)
unlink(file1)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.