[Matplotlib-users] function to create netcdf file
Hello, I'm trying to write a function to create a 'vanilla' NetCDF file to
which I can add data.
So far I have created the following, which is designed to set up a netcdf
file for the addition of global or at least lat/lon datasets. My question
has to do with attribute setting. Is it valid to do what I'm doing below
nco.attribute = attributevalue or do you have to use the setattr function
as outlined in some tutorials?
Thanks!
def default_netcdf(nco_filename,
lon0=-179.5,lat0=-89.5,
nx=720,ny=360,
dx=0.5,dy=0.5):
add default attributes and dimensions to the nc file
nco = NetCDFFile(nco_filename,'w')
nco.author = Some One
nco.createdate = dt.datetime.now().ctime()
nco.contact = some@python.com
nco.Conventions = CF-1.4
nco.createDimension('lon',nx)
nco.createDimension('lat',ny)
nco.createVariable('lat','d',('lat',))
nco.createVariable('lon','d',('lon',))
lon = np.arange(lon0,lon0+(nx*dx),dx)
lat = np.arange(lat0,lat0+(ny*dy),dy)
nco.variables['lat'][:] = lat
nco.variables['lon'][:] = lon
nco.createVariable('data','d',('lon','lat'))
return nco
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Re: [Matplotlib-users] function to create netcdf file
On Wed, Nov 11, 2009 at 7:31 AM, John [H2O] washa...@gmail.com wrote:
Hello, I'm trying to write a function to create a 'vanilla' NetCDF file to
which I can add data.
So far I have created the following, which is designed to set up a netcdf
file for the addition of global or at least lat/lon datasets. My question
has to do with attribute setting. Is it valid to do what I'm doing below
nco.attribute = attributevalue or do you have to use the setattr function
as outlined in some tutorials?
Thanks!
def default_netcdf(nco_filename,
lon0=-179.5,lat0=-89.5,
nx=720,ny=360,
dx=0.5,dy=0.5):
add default attributes and dimensions to the nc file
nco = NetCDFFile(nco_filename,'w')
nco.author = Some One
nco.createdate = dt.datetime.now().ctime()
nco.contact = some@python.com
nco.Conventions = CF-1.4
nco.createDimension('lon',nx)
nco.createDimension('lat',ny)
nco.createVariable('lat','d',('lat',))
nco.createVariable('lon','d',('lon',))
lon = np.arange(lon0,lon0+(nx*dx),dx)
lat = np.arange(lat0,lat0+(ny*dy),dy)
nco.variables['lat'][:] = lat
nco.variables['lon'][:] = lon
nco.createVariable('data','d',('lon','lat'))
return nco
That should work fine for settings attributes. Are you having a
problem? If so, can you paste the actual traceback?
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
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Re: [Matplotlib-users] function to create netcdf file
No problem.. just wanted to make sure it would work and is 'pythonic'.
I guess the biggest concern is that for others using the netcdf file, say
from matlab or somewhere else, will be able to access the attributes.
It seemed so easy to do it this way, I was curious why the tutorials suggest
using setattr(), and I wonder if perhaps what I'm setting is not 'global' or
perhaps wouldn't match some ISO or otherwise NetCDF standard??
Thanks!
On Wed, Nov 11, 2009 at 4:03 PM, Ryan May rma...@gmail.com wrote:
On Wed, Nov 11, 2009 at 7:31 AM, John [H2O] washa...@gmail.com wrote:
Hello, I'm trying to write a function to create a 'vanilla' NetCDF file
to
which I can add data.
So far I have created the following, which is designed to set up a netcdf
file for the addition of global or at least lat/lon datasets. My question
has to do with attribute setting. Is it valid to do what I'm doing below
nco.attribute = attributevalue or do you have to use the setattr
function
as outlined in some tutorials?
Thanks!
def default_netcdf(nco_filename,
lon0=-179.5,lat0=-89.5,
nx=720,ny=360,
dx=0.5,dy=0.5):
add default attributes and dimensions to the nc file
nco = NetCDFFile(nco_filename,'w')
nco.author = Some One
nco.createdate = dt.datetime.now().ctime()
nco.contact = some@python.com
nco.Conventions = CF-1.4
nco.createDimension('lon',nx)
nco.createDimension('lat',ny)
nco.createVariable('lat','d',('lat',))
nco.createVariable('lon','d',('lon',))
lon = np.arange(lon0,lon0+(nx*dx),dx)
lat = np.arange(lat0,lat0+(ny*dy),dy)
nco.variables['lat'][:] = lat
nco.variables['lon'][:] = lon
nco.createVariable('data','d',('lon','lat'))
return nco
That should work fine for settings attributes. Are you having a
problem? If so, can you paste the actual traceback?
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
--
Configuration
``
Plone 2.5.3-final,
CMF-1.6.4,
Zope (Zope 2.9.7-final, python 2.4.4, linux2),
Five 1.4.1,
Python 2.4.4 (#1, Jul 3 2007, 22:58:17) [GCC 4.1.1 20070105 (Red Hat
4.1.1-51)],
PIL 1.1.6
Mailman 2.1.9
Postfix 2.4.5
Procmail v3.22 2001/09/10
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Re: [Matplotlib-users] function to create netcdf file
On Wed, Nov 11, 2009 at 9:26 AM, John washa...@gmail.com wrote: No problem.. just wanted to make sure it would work and is 'pythonic'. I guess the biggest concern is that for others using the netcdf file, say from matlab or somewhere else, will be able to access the attributes. It seemed so easy to do it this way, I was curious why the tutorials suggest using setattr(), and I wonder if perhaps what I'm setting is not 'global' or perhaps wouldn't match some ISO or otherwise NetCDF standard?? It's actually just a nice part of the python language, setattr(a, 'foo', 'bar') is the same code as a.foo = bar. When working with NetCDF, the only time I've needed to use setarr (or getattr) is when the name of the attribute I want isn't a valid python identifier (like if an attribute has a - in it, e.g. 'unit-type'). Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] function to create netcdf file
It's actually just a nice part of the python language, setattr(a, 'foo', 'bar') is the same code as a.foo = bar. When working with NetCDF, the only time I've needed to use setarr (or getattr) is when the name of the attribute I want isn't a valid python identifier (like if an attribute has a - in it, e.g. 'unit-type'). Slick! Another great reason for python. Thanks for the rapid response. -- Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
