[ncl-talk] GOES16 netCDF files

[Mary Haley]

Hi Tim,

My apologies for getting back to you so late. We got side-tracked with
another harder GOES16 issue (regridding a large GOES16 variable) and wanted
to finish that up to make sure we were doing things correctly.

Rick and Bill (members of the NCL development team) spent some time looking
into documentation for GOES16 and figured out how to calculate the lat /
lon values, given the Y / X coordinates and map projection information on
the file. No sooner than this was done that the satellite was repositioned,
and we had to tweak the calculations a little.

I've attached the NCL scripts that Rick created, and the plot it generates.
This script should work on the new GOES16 data as well.

You need to run:

 ncl plot_goes16.ncl

The CMI_16 variable was arbitrarily chosen, but we did chose 16 over the
other numbers because it was more interesting.

I understand that there are different channels, and a better way to plot
this data might be to overlay the different channels with different
opacities set.  I need to look into how another user did this, and I'll
post back here if I ever get around to it.

--Mary




On Wed, Dec 13, 2017 at 1:02 PM, Tim Risner <trisner at awis.com> wrote:

> thanks Rick, others.
> version is 6.4.0
> running on Linux Amazon EC2 instance. x86_64 x86_64 x86_64 GNU/Linux
> testing GOES16 file attached.
> I obtained such file from the Amazon AWS bucket system that is now
> publicly accessible by the gov't/Amazon.
> Information on file lists it as a GOES16 netcdf file.
>
> I assumed I could simply replace the file in the example for GOES 11
> example here: http://www.ncl.ucar.edu/Applications/Scripts/goes_1.ncl
> and all would work if the files and datasets were exchangeable.
> Assumptions are likely my problem.
>
> Error output:
>
> fatal:["Execute.c":132]:variable (data) is not in file
> (/var/NCL/INPUT/GOES16.nc)
> fatal:["Execute.c":6381]:variable (data) is not in file (f)
> fatal:["Execute.c":8640]:Execute: Error occurred at or near line 4 in
> file /var/NCL/CODE/testgoes.nc
>
>
>
>
> *Tim Risner*
> *Operational Meteorologist*
> *(888) 798-9955 ext 1006 <(888)%20798-9955>*
>
> <http://www.awis.com>[image:
> https://www.facebook.com/AWISWeatherServices/]
> <https://www.facebook.com/AWISWeatherServices/>
> <https://twitter.com/awisweather>
>
> On Wed, Dec 13, 2017 at 9:02 AM, Rick Brownrigg <brownrig at ucar.edu> wrote:
>
>> Hi Tim,
>>
>> Do you have a dataset you could share?  I download some data from this
>> site:
>>
>> https://www.goes-r.gov
>>
>> but not knowing what I'm really looking for, I could not ascertain that
>> it was specifically GOES16. NCL was able to read it.
>>
>> I should also ask what version of NCL are you working with?
>>
>> If your dataset is too large to email, you can post it to our FTP site:
>>
>> http://ncl.ucar.edu/ftp_files.shtml
>>
>> Rick
>>
>> On Wed, Dec 13, 2017 at 7:35 AM, Tim Risner <trisner at awis.com> wrote:
>>
>>> Hello All,
>>> I am curious as to what the GOES16 netCDF plan is for NCL.
>>> I've attempted to ingest the new GOES16 netCDF into generic GOES code
>>> found on the examples pages, but am getting a variables not found error
>>> when attempting to produce an image. Variable not found is "data". I assume
>>> this is due to the differences between the GOES16 netCDF files and the
>>> older GOES products? or is it just operator error and GOES16 netcdf files
>>> should work?
>>>
>>> Thanks!!!
>>>
>>>
>>> *Tim Risner*
>>> *Operational Meteorologist*
>>> *(888) 798-9955 ext 1006 <(888)%20798-9955>*
>>>
>>> <http://www.awis.com>[image:
>>> https://www.facebook.com/AWISWeatherServices/]
>>> <https://www.facebook.com/AWISWeatherServices/>
>>> <https://twitter.com/awisweather>
>>>
>>> _______________________________________________
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>>
>
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