Description Usage Arguments Examples
Write a data.frame containing data on a grid as a netCDF file
1 2 |
d |
data.frame containing coordinates (along dimensions) and variables |
file |
output file path |
dimensions |
names or indexes of columns in d representing the data dimensions |
variables |
names or indexes of columns in d represented the measured variables. If NULL, all columns which are not dimensions are considered as variables |
units |
named vector or list containing character strings which specify the units of dimensions and variables. The names must be those of columns in d. Defaults to no unit |
attributes |
list of lists containing attributes (second-level lists) for each dimension and variable (first level list). The list must be named with names which are dimensions or variables (i.e. columns of d). Each second-level list is also a named list which stores attributes as key/value pairs, where the key is the name of the element of the list and the value is the content of that element |
global.attributes |
list of key/value pairs similar to the variables/dimensions attributes above but stored as global attributes of the file |
missval |
value used to code missing values in the netCDF file |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | # create data, on a grid, stored in a data.frame
x <- 1:3
y <- 1:2
d <- expand.grid(x=x, y=y)
d$V1 <- runif(nrow(d))
d$V2 <- rnorm(nrow(d), mean=90)
file_name <- tempfile()
nc_write(d, file=file_name,
# dimensions are specified, variables are not
# => variables are all other columns (V1 and V2)
dimensions = c("x", "y"),
# units are a named list
units = c(x="m", y="m", V1="degrees Celsius", V2="volts"),
# variables attributes are specified as a list of lists
attributes = list(
x = list(long_name="x coordinate", standard_name="x"),
y = list(long_name="y coordinate", standard_name="y"),
V1 = list(long_name="Temperature at surface", standard_name="temp"),
V2 = list(long_name="Tension between poles", standard_name="tension")
),
# global attributes are not associated with any particular variable
global.attributes = list(
author = "Pr Foobar",
convention = "CF-1.2",
date_created = "2014-06-19"
)
)
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