Re: [cf-satellite] missing value in auxillary coordinate variables

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Its a geostationary satellite imagery full disk dataset. If you want I can
upload a sample product. I hope you are able to conceptualize why it is
unavoidable to do away eith cold space.
regards
Ghansham
On Mar 2, 2014 6:19 PM, "rhorne@xxxxxxxxxxxxxxxxx" <rhorne@xxxxxxxxxxxxxxxxx>
wrote:

> Ghanshsan:
>
> I have a question about the variables (data structures) you are using to
> store the image data.
>
> If your data is on a lat/lon grid of some sort (e.g. 90 degrees of
> longitude and 180 degrees of latitude, which from a data structure
> perspective is rectangular and all pixels/data points are on-earth), what
> is the motivation for including off-earth regions in the data variable ?
>
> very respectfully,
>
> randy
>
>
>
> ------------------------------
> *From*: "Ghansham Sangar" <ghanshamsangar@xxxxxxxxx>
> *Sent*: Sunday, March 02, 2014 5:58 AM
> *To*: "cf-satellite" <cf-satellite@xxxxxxxxxxxxxxxx>
> *Subject*: Re: [cf-satellite] missing value in auxillary coordinate
> variables
>
>
> what is your opinion about geostationary satellites where we have to cold
> space all around the imaged disk and we are providing geolocation
> information per pixel lat /lon as 2D lat/lon arrays.
> Regards
> Ghansham
> On Mar 1, 2014 12:46 AM, "Jim Biard" <jbiard@xxxxxxxxxx> wrote:
>>
>> Ghansam,
>>
>> Actually, in the satellite world (or any trajectory or swath-type case),
>> it is entirely possible that you might have acquired measurements at a
>> point, but the location information for that point may have been garbled or
>> lost.  If we don't require linkage, then we can preserve the maximum amount
>> of data.
>>
>> Grace and peace,
>>
>> Jim
>>
>>     [image: CICS-NC] <http://www.cicsnc.org/>Visit us on
>> Facebook <http://www.facebook.com/cicsnc> *Jim Biard*
>> *Research Scholar*
>> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
>> North Carolina State University <http://ncsu.edu/>
>> NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
>> 151 Patton Ave, Asheville, NC 28801
>> e: jbiard@xxxxxxxxxx
>> o: +1 828 271 4900
>>
>>
>>
>> On Feb 28, 2014, at 2:12 PM, Ghansham Sangar <ghanshamsangar@xxxxxxxxx>
>> wrote:
>>
>>
>> hi sir
>> thanks a lot for the prompt reply.
>> obviously data should be missing where coordinates are missing.
>> ghansham
>> On Mar 1, 2014 12:22 AM, "Jim Biard" <jbiard@xxxxxxxxxx> wrote:
>>>
>>> Ghansham,
>>>
>>> I would say yes, unreservedly, but others are insisting that this only
>>> OK if you also have missing values in all the associated data variables.
>>>
>>> Grace and peace,
>>>
>>> Jim
>>>
>>>    [image: CICS-NC] <http://www.cicsnc.org/>Visit us on
>>> Facebook <http://www.facebook.com/cicsnc> *Jim Biard*
>>> *Research Scholar*
>>> Cooperative Institute for Climate and Satellites NC <http://cicsnc.org/>
>>> North Carolina State University <http://ncsu.edu/>
>>> NOAA's National Climatic Data Center <http://ncdc.noaa.gov/>
>>> 151 Patton Ave, Asheville, NC 28801
>>> e: jbiard@xxxxxxxxxx
>>> o: +1 828 271 4900
>>>
>>>
>>>
>>> On Feb 28, 2014, at 12:53 PM, Ghansham Sangar <ghanshamsangar@xxxxxxxxx>
>>> wrote:
>>>
>>>
>>> hi sir
>>> Is it possible to specify missing value in auxillaery coordinate
>>> variables (2-D lat/lon variables).
>>> Regards
>>> Ghansham
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>>>
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