Read XieArkin's precipitation data by ddf file

[Sara Rauscher]

Hi,

You can download a more grads-friendly version of the CMAP (Xie-Arkin)
precipitation from the IRI data library at

http://iridl.ldeo.columbia.edu/SOURCES/.NOAA/.NCEP/.CPC/.Merged_Analysis/.monthly/.v0411/

You can select time and spatial chunks and download it in multiple formats.

Or you can get it from the CDC at their web site:

http://www.cdc.noaa.gov/cdc/data.cmap.html

You should be able to open these netcdf files using the "sdfopen" command.

good luck.
sara

Ji-Yun SEO wrote:

>Hi ^^ HAPPY NEW YEAR!!
>
>I've been trying to draw a XieArkin's precipitation data netcdf file.
>when i downloaded it there is a referencing page to read these data using
>a Grads .ddf file
>Unfortunately, i coulnd't read it properly although i followed the
>direction.
>this's my prec.ddf file
>
>DSET ^XieArkin-1979-2002.nc
>*UNDEF 1E36
>UNDEF -999.f
>XDEF lon 144 Linear 0.0 2.5
>YDEF lat 73 Linear -90. 2.5
>TDEF time 288 Linear Jan1979 1mo
>VARS 1
>PRC2 => prc2 1 99 Precipitation
>ENDVARS
>
>i did gradsnc ; sdfopen prec.ddf
>but this error message comes out
>
>scanning self-describing file:  prec.ddf
>prec.ddf does not exist or is not a netCDF file.
>
>Couldn't ingest SDF metadata.
>If this was an HDF-SDS file, try gradshdf.
>
>please help me
>i would be grateful if i get any advice from you guys!!!
>
>

--
Dr. Sara A. Rauscher, Staff Associate
International Research Institute for Climate Prediction
Lamont Doherty Earth Observatory of Columbia University
101 Monell Building
PO Box 1000
Palisades NY 10964-8000
Phone: 845-680-4515
Fax: 845-680-4864