Re: update on trajectory support in idv?

• To: Nick Bower <nick.bower@xxxxxxxxxxxxxxxxxxxxx>
• Subject: Re: update on trajectory support in idv?
• From: Don Murray <dmurray@xxxxxxxxxxxxxxxx>
• Date: Thu, 08 Feb 2007 06:02:43 -0700

Hi Nick-

We currently support trajectories with a vertical dimension of
Altitude, but it looks like yours is pressure.  Do you have
an Altitude variable in your file?

You also need to select the Data Source Type in the chooser
as a Track File instead of using the default (I'm Feeling Lucky).
For .nc files, the default tries to open it as a grid.

Don Murray

Nick Bower wrote:

Hello.  Can someone update me on the state of trajectory support in IDV?

I'm trying to load the following netcdf but complains it isn't recognised as a grid (ok granted it has uppercase Latitude/Longitude, and no :cdm_datatype as UODC suggests, but then neither does your sample either at http://www.unidata.ucar.edu/software/netcdf-java/formats/TrajectoryCDL.txt ;)

netcdf WNISE.Clare.op..2006.Std.v1_2 {
dimensions:
       records = UNLIMITED ; // (66 currently)
       timedim = 2 ;
variables:
       int Time(records, timedim) ;
               Time:long_name = "Time" ;

Time:description = "For each record, the first element in the ti medim dimension is YYYYMMDD in decimal, where YYYY is the four-digit year, MM th e two digit-month, and DD the two digit day. The second element in the timedim d

imension is the number of milliseconds past midnight." ;
               Time:timezone = 0. ;
       float Latitude(records) ;
               Latitude:long_name = "Latitude" ;
               Latitude:units = "degrees_N" ;
               Latitude:_FillValue = -8888.f ;
               Latitude:missing_value = -8888.f ;
               Latitude:quality_group = 0 ;
       float Longitude(records) ;
               Longitude:long_name = "Longitude" ;
               Longitude:units = "degrees_E" ;
               Longitude:_FillValue = -8888.f ;
               Longitude:missing_value = -8888.f ;
               Longitude:quality_group = 1 ;
       float CentralPressure(records) ;
               CentralPressure:long_name = "Central Pressure" ;

CentralPressure:description = "Minimum value of the mean sea lev el atmospheric pressure, measured or estimated, at the centre of a tropical low

or tropical cyclone." ;
               CentralPressure:units = "hPa" ;
               CentralPressure:_FillValue = -8888.f ;
               CentralPressure:missing_value = -8888.f ;
               CentralPressure:quality_group = 2 ;
       float MaxWindSpd(records) ;
               MaxWindSpd:long_name = "Maximum Wind Speed" ;
               MaxWindSpd:units = "m s-1" ;
               MaxWindSpd:averaging_period = 600. ;
               MaxWindSpd:_FillValue = -8888.f ;
               MaxWindSpd:missing_value = -8888.f ;
               MaxWindSpd:quality_group = 3 ;
       float RadiusMaxWind(records) ;
               RadiusMaxWind:long_name = "Radius to Maximum Winds" ;

etc...

--
*************************************************************
Don Murray                               UCAR Unidata Program
dmurray@xxxxxxxxxxxxxxxx                        P.O. Box 3000
(303) 497-8628                              Boulder, CO 80307
http://www.unidata.ucar.edu/staff/donm
*************************************************************

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