The NCDF_VARGET1 procedure retrieves one element from a NetCDF variable. The NetCDF file must be in data mode to use this procedure.
NCDF_VARGET1, Cdfid, Varid, Value [, OFFSET=vector]
The NetCDF ID, returned from a previous call to NCDF_OPEN, NCDF_CREATE, or NCDF_GROUPDEF.
The NetCDF variable ID, returned from a previous call to NCDF_VARDEF or NCDF_VARID, or the name of the variable.
A named variable in which the value of the variable is returned. NCDF_VARGET1 sets Value’s size and data type as appropriate.
A vector containing the starting position of the read. The default starting position is [0, 0, ...].
Suppose that the file dave.nc contains an image saved with the NetCDF variable name “dave”. The following commands extract the value of a single pixel from the image:
; The location of the single element (pixel) whose value we will
; retrieve:
offset = [180,190]
; Open the NetCDF file:
id = NCDF_OPEN('dave.nc')
; Get the variable ID for variable "dave":
varid = NCDF_VARID(id, 'dave')
; Extract the element and return the value in the variable
; single_pixel:
NCDF_VARGET1, id, varid, single_pixel, OFFSET=offset
; Close the NetCDF file:
NCDF_CLOSE, id
|
Pre 4.0 |
Introduced |