Prajjwal,

It works fine for me. I have of course no idea how you generated the error
message. The website has clear instructions on how to install the package.

Changing code between ncdf and ncdf4 is relatively straightforward but
tedious enough to avoid if you can. I do not understand how it is you have
any code if you cannot use the package.

Robert

On Thu, Jan 31, 2013 at 1:51 PM, ppanday <ppanday@clarku.edu> wrote:

> Robert,
>
> The ncdf4 through David Pierce's site seems incompatible with R version
> 2.15.2.
> ( package ‘C:/Data/Downloads/ncdf4_1.4.zip’ is not available (for R
> version 2.15.2).
> Is there an alternate way to get it for R 32 bit windows? Or is it easier
> to switch my code to ncdf package?
>
> Prajjwal
> ________________________________
> From: Robert Hijmans [via R-sig-geo] [
> ml-node+s2731867n7582444h84@n2.nabble.com]
> Sent: Thursday, January 31, 2013 4:04 PM
> To: Panday, Prajjwal
> Subject: Re: Rasterbrick to netCDF
>
> Prajjwal, you can install ncdf4 on windows (not from CRAN, but from here
> http://cirrus.ucsd.edu/~pierce/ncdf/ ) but it may be easier to use the
> ncdf
> library instead. Robert
>
> On Thu, Jan 31, 2013 at 11:21 AM, ppanday <[hidden
> email]<UrlBlockedError.aspx>> wrote:
>
> > Robert
> >
> > Yes, the ncdf4 packages works fine. However, it seems it runs in the unix
> > environment currently. Thank you for your response.
> >
> > Sincerely,
> > Prajjwal
> > ________________________________
> > From: Robert Hijmans [via R-sig-geo] [
> > [hidden email]<UrlBlockedError.aspx>]
> > Sent: Wednesday, January 30, 2013 7:57 PM
> > To: Panday, Prajjwal
> > Subject: Re: Rasterbrick to netCDF
> >
> > Prajjwal,
> > As Thiago shows you can do such things directly via the ncdf(4) package;
> > raster does not provide too many options beyond setting variable names
> > (arguments varname, varunit, longname, xname, yname, zname, zunit), see
> > ?writeRaster. It would be nice to expand that and allow for more flexible
> > ncdf file writing from Raster objects.
> > Robert
> >
> >
> > On Thu, Jan 24, 2013 at 6:37 PM, Thiago V. dos Santos <
> > [hidden email]<UrlBlockedError.aspx>> wrote:
> >
> > > Hi Prajjwal,
> > >
> > > I think the best approach in your case is to create a new, updated
> netcd
> > > file instead of adding a dimension to an existing file. By using the
> > ncdf4
> > > package to create the file, you have lots of options to customize names
> > and
> > > descriptions of variables and dimensions.
> > >
> > > At the end of this message you can see the code that I use to create a
> > > netcdf file with global coverage at 0.5 degree resolution based
> obviously
> > > on a netcdf with the same features. The resulting netcdf will contain
> one
> > > level "slice" and 12 time "slices". One detail about netcdf files is
> that
> > > the coordinates of point refers to the center of the point and not to
> the
> > > edge. That's why I start longitude at -179.75 instead of -180 and
> > longitude
> > > at 89.75 instead of 90.
> > >
> > > If the resulting file looks like longitude and latitude are inverted,
> you
> > > must transpose the data when converting raster to matrix:
> > > data <- t(as.matrix(r))
> > >
> > >
> > > I hope it helps,
> > >
> > > Thiago.
> > >
> > > #--------------------------------------------------------begin of
> > > code-----------------------------------------------------
> > >
> > > # Load required packages
> > > library(raster)
> > > library(ncdf4)
> > >
> > > # Load your data
> > > r <- raster('old_file.nc')
> > >
> > > # Here's the trick: convert your data to a matrix
> > > data <- as.matrix(r)
> > >
> > > # Now that we have the data we need, make output file in the correct
> > format
> > >
> > > # Create dimensions lon, lat, level and time
> > > dim_lon  <- ncdim_def('longitude', 'degrees_east',
> > > seq(-179.75,179.75,by=0.5))
> > > dim_lat  <- ncdim_def('latitude', 'degrees_north',
> > > seq(89.75,-89.75,by=-0.5))
> > > dim_lev  <- ncdim_def('level', 'level/index', 1)
> > > dim_time <- ncdim_def('time', "years since 1990-01-01", 1:12, unlim=T)
> > >
> > > # Create a new variable "precipitation", create netcdf file, put
> updated
> > > contents on it and close file
> > > # Note that variable "data" is the actual contents of the original
> netcdf
> > > file
> > > var_out <- ncvar_def('precipitation', 'mm/day',
> > > list(dim_lon,dim_lat,dim_lev,dim_time), 9.e20)
> > > ncid_out <- nc_create('updated_netcdf.nc', var_out)
> > > ncvar_put(ncid_out, var_out, data, start=c(1, 1, 1, 1), count=c(720,
> 360,
> > > 1, 12))
> > > nc_close(ncid_out)
> > > #--------------------------------------------------------end of
> > > code-----------------------------------------------------
> > >
> > >
> > > ----- Original Message -----
> > > From: ppanday <[hidden email]<UrlBlockedError.aspx>>
> > > To: [hidden email]<UrlBlockedError.aspx>
> > > Cc:
> > > Sent: Thursday, January 24, 2013 3:54 PM
> > > Subject: [R-sig-Geo] Rasterbrick to netCDF
> > >
> > > Hello
> > >
> > > I have an output from R-script in the form of a rasterbrick with 3
> > > dimensions (time, latitude, longitude). I want to be able to write it
> to
> > a
> > > netCDF format, add another dimension (time, level, latitude,
> longitude),
> > > and
> > > be able to edit dimension attributes.
> > > Below you will see the properties when I write my rasterbrick to a
> netCDF
> > > format using writeRaster.
> > > I would like to change 'value' dimension to time, and edit time:units
> as
> > > well.
> > > Alternatively, is there a way I can copy dimensions and attributes from
> > > another netCDF template and put my rasterbrick in that empty netCDF
> file?
> > > Any help is greatly appreciated.
> > >
> > > Sincerely,
> > > Prajjwal
> > >
> > >
> > > dimensions:
> > >     longitude = 720 ;
> > >     latitude = 360 ;
> > >     value = UNLIMITED ; // (12 currently)
> > > variables:
> > >     double longitude(longitude) ;
> > >         longitude:units = "degrees_east" ;
> > >         longitude:long_name = "longitude" ;
> > >     double latitude(latitude) ;
> > >         latitude:units = "degrees_north" ;
> > >         latitude:long_name = "latitude" ;
> > >     int value(value) ;
> > >         value:units = "unknown" ;
> > >         value:long_name = "value" ;
> > >     float prec(value, latitude, longitude) ;
> > >         prec:_FillValue = -3.4e+38 ;
> > >         prec:missing_value = -3.4e+38 ;
> > >         prec:long_name = "prec" ;
> > >         prec:projection = "+proj=longlat +datum=WGS84 +ellps=WGS84
> > > +towgs84=0,0,0"
> > > ;
> > >         prec:projection_format = "PROJ.4" ;
> > >         prec:min = 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0. ;
> > >         prec:max = 663.033325195312, 553.867553710938,
> 595.225219726562,
> > > 577.460388183594, 688.026123046875, 1178.05859375, 1098.39819335938,
> > > 1269.41442871094, 1184.70092773438, 1013.62524414062, 755.313537597656,
> > > 633.667541503906 ;
> > >
> > > // global attributes:
> > >         :Conventions = "CF-1.4" ;
> > >         :created_by = "R, packages ncdf and raster (version 2.0-31)" ;
> > >         :date = "2013-01-24 15:58:09" ;
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > --
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> > >
> >
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