4.0 Using IDL to read netCDF files
IDL can read netCDF files and specifically
has a browser to do this (see page 137 of What's new in IDL 5.3). In addition
IDL has specific routines for reading netCDF files. However, the simplest way
to create the IDL code you need to read a netCDF file is to use the IDL programs
cdf2idl (at the above site or
http://www-c4.ucsd.edu/~cids/software/visual.html ). The concept of this
program is similar cdf2fortran.f, cdf2c.c, and cdf2asc.c programs and is provided
by the same group (C4 Interactive Display System). This program reads a netCDF
file and creates another IDL script which can read the netCDF file.
4.1 Example of using cdf2idl
From within IDL all you need to do,
to read the current meter data file shown for the cdf2fortran example is
IDL> .run cdf2idl.pro
IDL> cdf2idl, 'rcm00683.cdf'
At the completion of this script
all of the current meter data are in memory ready to be analysed. A total of
3 lines of IDL code needed to read this data set. These three lines of code
are so general that they will actually read any of the netCDF files from any
of the WOCE Data Assembly Centres provided as part of the WOCE Global Data V3.0.