Re: [idvusers] Issues opening NetCDF trajectory file in IDV and ToolsUI

Hi John,

Yes it's a single trajectory. Thanks to check the NetCDF, we will add the
"trajectory" variable.

I will wait the IDV handle CF 1.6 point files.

Thanks


El 6 de marzo de 2012 17:16, John Caron <caron@xxxxxxxxxxxxxxxx> escribió:

> HI Kristian :
>
> Your file appears to be trying to follow CF 1.6 point conventions. Which
> form are you intending to use? It looks like a single trajectory (H.4.2) ?
>
> http://cf-pcmdi.llnl.gov/**documents/cf-conventions/1.6/**
> cf-conventions.html#idp8388800<http://cf-pcmdi.llnl.gov/documents/cf-conventions/1.6/cf-conventions.html#idp8388800>
>
> it seems to be missing:
>
>       char trajectory(name_strlen) ;
>          trajectory:cf_role = "trajectory_id";
>
>
> Anyway, the problem is that the IDV cannot yet handle CF 1.6 point files.
> Its on our list to get this working.
>
> John
>
>
> On 3/6/2012 6:34 AM, Kristian Sebastián wrote:
>
>> Hi,
>>
>> The attached NetCDF file is a valid "Track file" Data type. The IDV can
>> open it and  display the parameters (platform speed, temperature...). What
>> modifications have I do?
>> I must rename the latitude, longitude and altitude coordinates variables .
>> The original name was "LAT", "LON" and "ALT", now "latitude, "longitude"
>> and "altitude".
>> Maybe, the NetCDF library looks for the coordinate variable from the
>> variable name, not the standard name. It should look for the standar
>> name... no?
>>
>>
>> El 6 de marzo de 2012 09:38, Kristian Sebastián <ksebastian@xxxxxxxx<mailto:
>> ksebastian@xxxxxxxx>> escribió:
>>
>>
>>    Hi Yuan Ho,
>>
>>    We have also glider trajectories and we can open them with the IDV
>>    as "Track file" data type. But if I open the surface drifter
>>    NetCDF file as track file the IDV throws the exception attached in
>>    the TrackFileError image. That's why testing the "Trajectory
>>    Sounding files" Data type is see the time issue. I can't change
>>    the time units to seconds since 1980-01-06 00:00:00, so more
>>    testing is needed!.
>>
>>    Thanks a lot!
>>
>>    2012/3/6 Yuan Ho <yuanho@xxxxxxxxxxxxxxxx
>>    <mailto:yuanho@xxxxxxxxxxxxx**edu <yuanho@xxxxxxxxxxxxxxxx>>>
>>
>>
>>        On 3/5/2012 2:13 AM, Kristian Sebastián wrote:
>>
>>            Hi,
>>
>>            We save the surface drifter data in NetCDF format and
>>            CF-1.6 ( like the
>>            "dep0002_idrifter003_scb-**idrifter003_L1_2012-02_depth.**nc"
>>            attached file).
>>            When we try to display it through the IDV some issue :
>>
>>               - The "Data Source type" selected to open the NetCDF
>>            file is "Trajectory
>>
>>               Sounding Files" no "Track files" (throws a
>>            BadDataexpception). Is the data
>>               type correct?
>>
>>
>>        Trajectory sounding Files is designed for the COMSIC dataset,
>>        if you want to use this type, you need to modify unit of time
>>        of your dataset to seconds since 1980-01-06 00:00:00, and the
>>        values too.
>>
>>
>>
>>        Yuan
>>
>>               - We can display the trajectory and the parameters like
>>            temperature,
>>
>>               platform speed ... but the displayed time in IDV is
>>            wrong "3645241-01-9"
>>               (view MapViewSurfaceDrifterWrongTime image)
>>               - The axis Z is defined with the ALT (standard_name =
>>            altitude)
>>
>>               variable, but if the axis Z with the DEPTH
>>            (standard_name = depth)
>>               variable, only the bounding box is displayed in the
>>            "Map View" (view
>>               MapViewSurfaceDrifterOnlyBound**ingBox image)
>>
>>            I have also tried to open the file with the ToolsUI-4.2.18
>>            but I can't open
>>            it as "Trajetory" in the "FeatureType" (view
>>            FailedTodFindDataTypeFactory
>>            image).
>>            The coordinate system seems to be ok, I have checked it
>>            opening the file
>>            with the tab "CoordSys".
>>            As "PointFeature"-"TRAJECTORY" is possible to open it and
>>            display all the
>>            dataset values (view PointFeatureTRAJECTORY image). The
>>            time values seems
>>            to be ok, I don't why in the IDV the time value is wrong.
>>            An "unknown"
>>            point is displayed in the map.
>>
>>            Thanks
>>
>>
>>
>>
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>>
>>    --
>>
>>
>>        Kristian Sebastian Blalid
>>        SOS Division: Data Center Technical
>>        Tel: 971439860 - Fax: 971439979
>>        E-mail: kristian.sebastian@xxxxxxxx
>>        <mailto:sonia.gomara@xxxxxxxx> / kristian.sebastian@xxxxxx
>>        <mailto:sonia.gomara@xxxxxx>
>>
>>
>>
>>
>>
>> --
>>
>>
>>
>>    Kristian Sebastian Blalid
>>    SOS Division: Data Center Technical
>>    Tel: 971439860 - Fax: 971439979
>>    E-mail: kristian.sebastian@xxxxxxxx
>>    <mailto:sonia.gomara@xxxxxxxx> / kristian.sebastian@xxxxxx
>>    <mailto:sonia.gomara@xxxxxx>
>>
>>
>>
>>
>>
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-- 

 Kristian Sebastian Blalid
SOS Division: Data Center Technical
Tel: 971439860 - Fax: 971439979
E-mail: kristian.sebastian@xxxxxxxx <sonia.gomara@xxxxxxxx> /
kristian.sebastian@xxxxxx <sonia.gomara@xxxxxx>