Re: track plots

       lat = addfile("$PATH/TRACK_lat_200704.nc","r")
       lon = addfile("$PATH/TRACK_lon_200704.nc","r")

As noted by Andrea, the above are incorrect. In fact, they are
incorrect in two ways: (a) the path and (b) the way
the file is opened.

      path = getenv("PATH")

      f = addfile (path+"TRACK_lat_200704.nc","r")
      lat = f->lat
      f = addfile (path+"TRACK_lon_200704.nc","r")
      lon = f->lon

Please note that both "lat" and "lon" should have the missing value
attribute _FillValue

http://www.ncl.ucar.edu/Document/Functions/Built-in/getenv.shtml

I suggest that you download/read the mini-language manual at:
 http://www.ncl.ucar.edu/Document/Manuals/

Good luck

Hahmann, Andrea N. wrote:
> Christine
>
> The correct syntax for what you want to do is:
>
> ff = addfile(<lat file name>,"r")
> lat = ff->lat (or name of field in netcdf file)
> ff = addfile(<lon file name>,"r")
> lon = ff->lon (or name of field in netcdf file)
>
> You need to open the files first, then read from them.
> Hope this helps,
>
> Andrea
>
> Andrea Hahmann, PhD.
> Senior Scientist
> Phone direct +45 4677 5471
> andrea.n.hahmann_at_risoe.dk
>
> Wind Energy Department
> Risø National Laboratory for Sustainable Energy
> Technical University of Denmark
> Building 118, P.O. Box 49
> DK-4000 Roskilde, Denmark
> Tel +45 4677 4677
> Fax +45 4677 5083
>
> -----Original Message-----
> From: ncl-talk-bounces_at_ucar.edu [mailto:ncl-talk-bounces_at_ucar.edu] On Behalf Of Christine.Radermacher_at_gfi.uib.no
> Sent: Wednesday, April 22, 2009 4:05 PM
> To: ncl-talk_at_ucar.edu
> Subject: track plots
>
>
> Hello,
>
> I would like to plot storm tracks with ncl.
> The tracks are stored in NetCDF and the latitude and longitude
> variables both have the form
>
> 1: lat1 lat2 lat3 missing missing ......
> 2: lat1 lat2 lat3 lat4 missing missing .....
> .
> .
> .
>
> so that each track is filled with missing values to a certain length.
>
> I tried to modify the traj_1.ncl script for that problem and modified
> the beginning like that:
>
> ;*************************************************
> ; traj_1.ncl
> ;*************************************************
> load "/usr/share/ncarg/nclscripts/csm/gsn_code.ncl"
> load "/usr/share/ncarg/nclscripts/csm/gsn_csm.ncl"
> ;**************************************************
> begin
> ;*************************************
> ; read in data
> ;************************************
>
> lat = addfile("$PATH/TRACK_lat_200704.nc","r")
> lon = addfile("$PATH/TRACK_lon_200704.nc","r")
> ntime=105
>
> Then I get the following error:
> warning:TextItem:libncarg Error:PLCHHQ - DATASET NOT LOADED CORRECTLY
> Segmentation fault
>
> I hope you could help me.
>
> Regards
> Christine
>
>
>
>
>
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>
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-- 
======================================================
Dennis J. Shea                  tel: 303-497-1361    |
P.O. Box 3000                   fax: 303-497-1333    |
Climate Analysis Section                             |
Climate & Global Dynamics Div.                       |
National Center for Atmospheric Research             |
Boulder, CO  80307                                   |
USA                        email: shea 'at' ucar.edu |
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