Re: [thredds] opendap query base on a list of lat/lon? [SEC=UNCLASSIFIED]

• To: 'Ethan Davis' <edavis@xxxxxxxxxxxxxxxx>, "thredds@xxxxxxxxxxxxxxxx" <thredds@xxxxxxxxxxxxxxxx>
• Subject: Re: [thredds] opendap query base on a list of lat/lon? [SEC=UNCLASSIFIED]
• From: Frank Erjiang Fu <F.Fu@xxxxxxxxxx>
• Date: Tue, 26 Feb 2013 12:04:48 +1100

Hi Ethan,

Thank you for your response. Yes, you are right with my question. 

We are thinking to develop a service to 1)get data from Thredds opendap, 2) 
perform point-in-polygon filter, and 3) return data in either NetCDF or JSON to 
our web application. 

BTW, we have James Gallagher here in Melbourne (Australian Bureau of 
Meteorology). We will ask him the question and many other questions. :)

Regards,
Frank

-----Original Message-----
From: thredds-bounces@xxxxxxxxxxxxxxxx 
[mailto:thredds-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Ethan Davis
Sent: Tuesday, 26 February 2013 11:24 AM
To: thredds@xxxxxxxxxxxxxxxx
Subject: Re: [thredds] opendap query base on a list of lat/lon? 
[SEC=UNCLASSIFIED]

Hi Frank,

I hope I'm interpreting your question correctly ...

The OPeNDAP protocol only supports sequential and regularly spaced array
index requests, e.g.:

- every point from index 0 thru 12 -- [0:1:12]
  (0, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72)

- every 5th point from index 2 thru 12 -- [2:5:12]
  (12, 42, 72)

If you want a list of index points that doesn't fit one of the above
patters, you would need to either extract additional points that you
actually want or make multiple requests.

Ethan

On 2/24/2013 5:22 PM, Frank Erjiang Fu wrote:
> Hello,
>  
> Does anyone know how to make opendap url query base on a list of
> lat/lon? For example, can we do things like lat[0:1:0; 3:1:3];lon[2:1:2;
> 5:1:5]?
>  
> Thanks!
>  
> Regards,
> ** 
> *Dr Frank Erjiang Fu*
> Senior Environmental IT Specialist
>  
> Climate and Water Division
> Australian Bureau of Meteorology

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• References:
  • [thredds] opendap query base on a list of lat/lon? [SEC=UNCLASSIFIED]
    • From: Frank Erjiang Fu
  • Re: [thredds] opendap query base on a list of lat/lon? [SEC=UNCLASSIFIED]
    • From: Ethan Davis