Re: [thredds] Constraint expression when choice of longitudinal extent spans prime meridian

• To: "ashwinD12 ." <winash12@xxxxxxxxx>
• Subject: Re: [thredds] Constraint expression when choice of longitudinal extent spans prime meridian
• From: Sean Arms <sarms@xxxxxxxx>
• Date: Fri, 3 Jun 2016 09:56:10 -0600

Greetings Ashwin,

In many cases, yes, but it is not always going to be located at the prime
meridian. The actual issue is querying data that crosses the edges of a
data array for global grids. Since OPeNDAP is array index based, you must
make two calls.

In the next major version of the netCDF-Java library (version 5), you can
do this in one call using the new Coverage API. Note that this can be used
when accessing data from any DAP enabled server (that is, this is not
limited to accessing data from a TDS running the next major version).

Cheers,

Sean


On Fri, Jun 3, 2016 at 9:44 AM, ashwinD12 . <winash12@xxxxxxxxx> wrote:

> Hello,
>            I had an associate of mine inform me that when an OpenDAP
> expression's longitudinal extent spans the prime meridian then we must
> query the data on both sides of the prime meridian and join the results. Is
> that accurate ?
>
> Regards,
> Ashwin.
>
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• References:
  • [thredds] Constraint expression when choice of longitudinal extent spans prime meridian
    • From: ashwinD12 .