Python modules for NetCDF, udunits, OPeNDAP?

[Johnolulu]

Hi All,
What Python modules are people using for reading NetCDF data and
converting units via udunits? OPeNDAP access would also be a huge
plus. There seem to be several packages available with varying degrees
of complexity/functionality (http://www.unidata.ucar.edu/software/
netcdf/software.html#Python) and rather than try them all myself, I'm
hoping to get recommendations here. CDAT looked promising at first
(http://www2-pcmdi.llnl.gov/cdat) but the installation has proven
beastly. I want to do simple things like read in a variable, gets its
min/max values, convert time units to seconds since the epoch, etc.
for simple sanity checks. Later I will also want to make map and line
plots as well but may end up using something besides Python.
Thanks!,
John Maurer
Hawaii Ocean Observing System (HiOOS)

[MBAR...@gmail.com]

Hi John,

I just saw this post and hope you've gotten some responses. 

I've been using pydap from pydap.org.  Make sure you also install the coards module which performs conversions to & from Python's datetime.datetime to index space.

-Mike

[Rich Signell]

Gang,

I've been promoting NetCDF4-Python over pydap, since this allows you
to access NetCDF files and OpenDAP datasets using exactly the same
methods.

It also handles time nicely, and has the ability open a "multifile
collection", just in case you find yourself trying to access data from
a collection of data that should have been aggregated, but was not.

This is built directly on top of the Unidata C NetCDF library, which
can make building it a pain, but luckily, NetCDF4-Python with OPeNDAP
support is part of the recent Enthought Python Distribution, which
means you can install with a one-line command on 32/64 bit Windows,
Mac and Linux.

-Rich

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Dr. Richard P. Signell   (508) 457-2229
USGS, 384 Woods Hole Rd.
Woods Hole, MA 02543-1598