Emanuele,
You can also use the TDS NetCDF Subset Service "Grid as Point
Dataset", if what you want is to extract time series at a point. It
can return XML. Here's an example extracting surface pressure for the
next two days from the NAM model for Boston, MA:
http://thredds.ucar.edu/thredds/ncss/grid/grib/NCEP/NAM/CONUS_12km/best?var=Pressure_surface&latitude=42.37&longitude=-71.03&time_start=2014-01-14T00%3A00%3A00Z&time_end=2014-01-16T00%3A00%3A00Z&vertCoord=&accept=xml
If you click the NCSS service link for a particular dataset on the
TDS, there is GUI that helps folks construct these RESTful queries,
for example:
http://thredds.ucar.edu/thredds/ncss/grid/grib/NCEP/NAM/CONUS_12km/best/dataset.html
-Rich
On Tue, Jan 14, 2014 at 10:21 AM, Jeff McWhirter
<jeff.mcwhirter@xxxxxxxxx> wrote:
> Hi Emanuale,
>
> We've been building out various text formats for access to point and model
> data in RAMADDA. The TDS and RAMADDA provide time series extraction services
> for grids. Currently there isn't any good standard for writing gridded data
> as a text file.
>
> In RAMADDA we've been working on a JSON encoding. We use Unidata's Java CDM
> for the heavy lifting and the transform the CSV timeseries into JSON. We are
> looking for some feedback on this JSON format. It is really (really) new and
> I will be writing up documentation today as a matter of fact.
>
>
> -Jeff]
>
>
>
> On Tue, Jan 14, 2014 at 8:05 AM, Ben Domenico <bendomenico@xxxxxxxxx> wrote:
>>
>> Hi Emanuele and Sean,
>>
>> There are other approaches to doing at least part of what you suggest.
>>
>> For example, if you use the WCS or WMS interface to a THREDDS Data Server,
>> you can make your request in coordinate (lat/long) space. At one point, it
>> was possible to request the output in certain dialects of XML. In
>> particular NcML and NcML-GML. I'm not sure option for these formats is
>> still supported in the more recent versions of the TDS, but we are working
>> on a draft standard for such an encoding in the OpenGeospatial Consortium.
>>
>> I am working on two projects that may have a bearing on your needs. One
>> involved writing python clients for WMS and WCS. The other involves using
>> a technology called brokering that could run in concert with your TDS to
>> produce the XML output if it is no longer an option in the TDS.
>> Unfortunately these projects are under development so they may not be of
>> help immediately, but it will be good for us to keep your needs in mind as a
>> practical use case.
>>
>> Also note that we are working with Stefano Nativi's team at the Italian
>> CNR on these projects. Perhaps you know Stefano.
>>
>> -- Ben
>>
>>
>> On Tue, Jan 14, 2014 at 7:48 AM, Sean Arms <sarms@xxxxxxxxxxxxxxxx> wrote:
>>>
>>> Hi Emanuele,
>>>
>>> Are you looking to return a grid or time series from a given lat/lon
>>> point?
>>>
>>> Cheers!
>>>
>>> Sean
>>>
>>> On 1/14/14, 3:31 AM, emanuele lombardi wrote:
>>> > Hi,
>>> >
>>> > we need to build an IOS app (and also an Android one) to display on
>>> > smartphones data coming from our THREDDS server. Programming would be
>>> > easier
>>> > if the
>>> > app could:
>>> >
>>> > 1) send to TDS the values of lat & lon (instead of I and J index) to
>>> > define the requested area
>>> > 2) get data from TDS in XML format (insted of ascii or netcdf)
>>> >
>>> > Am I out of look?
>>> >
>>> > Do you think it is possible to have the Netcdf Java library run on IOS
>>> > and Android?
>>> >
>>> > Thank you very much,
>>> > Emanuele
>>> >
>>> >
>>>
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>>
>>
>>
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>
>
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