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[THREDDS #LUC-457370]: Question on latitude for gridded data set

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  • Subject: [THREDDS #LUC-457370]: Question on latitude for gridded data set
  • Date: Tue, 20 Apr 2010 07:02:14 -0600
2009-12-18T12:00:00Z is universal (greenwich) time


> Hello Ethan,
> 
> Many thanks for the clarification. I have one final question/clarification. I 
> am still a little confused about the time zone. Let us say I am interested in 
> Temperature_surface over a period of time at 40 N & 75W (EST). And I get the 
> following data from your data base.
> 
> date,lat[unit="degrees_north"],lon[unit="degrees_east"],Temperature_surface[unit="K"]
> 2009-12-18T12:00:00Z,40.0,-75.0,266.8
> 2009-12-18T15:00:00Z,40.0,-75.0,271.24
> 2009-12-18T18:00:00Z,40.0,-75.0,274.6
> 
> Do the temperatures [266.8, 271.24 274.6] correspond to [7AM 10AM 1PM] EST or 
> do they correspond to [12PM 3PM 6PM] EST, respectively?
> 
> Thanks
> - Shiva
> 
> -----Original Message-----
> From: Unidata THREDDS Support [mailto:address@hidden]
> Sent: Thursday, December 17, 2009 6:50 PM
> To: Kameswaran, Shivakumar UTRC
> Cc: address@hidden
> Subject: [THREDDS #LUC-457370]: Question on latitude for gridded data set
> 
> Hi Shiva,
> 
> > Many thanks for your response. So if the longitude goes from 0 to 360,
> > what convention is followed to represent points east and west of the
> > Greenwich meridian. Also, if I want the conditions at 75 W (longitude),
> > should I specify -75 or should I specify it as (360-75)? I current
> > specify it as -75 and I do get some numbers out of the database.
> > So what does -75 correspond to?
> 
> The longitude is in degrees east of the Greenwich meridian. So 1 is just east 
> of the meridian and 359 is just west. The prefered input for 75 W would be 
> 285. I'm not sure about what -75 returns. I'm guessing that gets converted to 
> 285 internally as well but I'm not absolutely sure.
> 
> Ethan
> 
> 
> Ticket Details
> ===================
> Ticket ID: LUC-457370
> Department: Support THREDDS
> Priority: Normal
> Status: Closed
> 
> 


Ticket Details
===================
Ticket ID: LUC-457370
Department: Support THREDDS
Priority: Critical
Status: Closed