The netCDF operators NCO version 3.9.2 are ready.
http://nco.sf.net (Homepage)
http://dust.ess.uci.edu/nco (Homepage "mirror")
First, the NCO licenses have changed from GPL2 (code) and FDL1.1
(documentation) to GPL3 (code) and FDL1.2 (documentation).
Second, 3.9.2 also introduces ncap2 printing and type-conversion
and beta-support for UDUnits2. As usual the latest build
and compile tweaks have been made to improve portability.
Finally, the major user-visible change is that the default attribute
if any, specifying the value of data to ignore has (finally) changed
from "missing_value" to "_FillValue".
Supporting both of these attributes simultaneously is not practical.
Hence the behavior NCO used to apply to missing_value's now applies to
_FillValue's---missing_value's are now treated as normal data.
The NCO user's guide shows how to ease migration to this new behavior.
A. Change from GPL2 to GPL3
http://www.gnu.org/copyleft/gpl.html
B. UDUnits2 beta-support. Compile with 'UDUNITS2=Y', send us feedback.
Binaries (RPMs, Debs) still use UDUnits1. Thanks to Steve Emmerson.
http://nco.sf.net/nco.html#UDUnits2
C. Ignore data equal to _FillValue (rather than missing_value)
Hints and examples to handle new or to revert to old behavior:
http://nco.sf.net/nco.html#_FillValue
D. Improved Documentation:
Working with non-standard grids, e.g., 2D grids fxm
http://nco.sf.net/nco.html#grd
E. ncap2 continues to grow more powerful (Henry Butowsky)
All functions (e.g., cos(), avg()) are now available as methods
(e.g., var.cos(), var.avg(x,y))
Demonstration scripts ~/nco/data/[bin_cnt.nco,psd_wrf.nco]
F. ncap2 supports type conversion (Henry Butowsky)
ncap2 -s 'big_int=uint64(small_int)+double(small_int);' in.nc out.nc
http://nco.sf.net/nco.html#ncap2
G. ncap2 now prints variables and metadata (Henry Butowsky)
ncap2 -s 'foo=1;print(foo)' in.nc out.nc
http://nco.sf.net/nco.html#ncap2
H. Pre-built, up-to-date, Debian Sid & Ubuntu binaries are available.
http://nco.sf.net#debian
I. Pre-built, up-to-date, RPM packages are available.
http://nco.sf.net#rpm
J. Reminder: NCO support for netCDF4 features is tracked at
http://nco.sf.net/nco.html#nco4
NCO currently supports netCDF4 atomic data types and compression.
NCO 3.9.2 with netCDF4 support should work with HDF5 1.8 beta2
and netCDF4 snapshot20070822 and newer.
export NETCDF4_ROOT=/usr/local/netcdf4 # Set netCDF4 location
cd ~/nco;./configure --enable-netcdf4 # Configure mechanism -or-
cd ~/nco/bld;./make NETCDF4=Y allinone # Old Makefile mechanism
The next release will debut a user-friendly version of SWAMP, the NCO
server-side processor (http://dust.ess.uci.edu/ppr/ppr_WZJ073.pdf).
Enjoy,
Charlie
--
Charlie Zender, Department of Earth System Science, UC Irvine
Visiting LGGE until 20080715 :) Voice: 011+33+476+824236
Laboratoire de Glaciologie et Geophysique de l'Environnement
BP 96, 54 rue Moliere, 38402 Saint Martin d'Heres Cedex, France
