[ncl-talk] GOES16 netCDF files

Fri Jan 19 13:54:00 MST 2018

Works great Mary, and you can easily pull the sat wavelength you need from it. 
One issue I did run into was if you use the “Full Disk” files rather then the “CONUS” files used in the example, you get 
what I expect to be a memory issue?

Error to screen
*******************
“fatal: NclMalloc Failed:[errno=12] Segmentation fault” error. 

info 
******
Variable: phi
Type: double
Total Size: 235358208 bytes
            29419776 values
Number of Dimensions: 2
Dimensions and sizes:	[5424] x [5424]
Coordinates: 
Number Of Attributes: 1
  _FillValue :	-999

Variable: lambda
Type: double
Total Size: 235358208 bytes
            29419776 values
Number of Dimensions: 2
Dimensions and sizes:	[5424] x [5424]
Coordinates: 
Number Of Attributes: 1
  _FillValue :	-999

Variable: data
Type: float
Total Size: 117679104 bytes
            29419776 values
Number of Dimensions: 2
Dimensions and sizes:	[y | 5424] x [x | 5424]
Coordinates: 
            y: [0..5423]
            x: [0..5423]
Number Of Attributes: 16
  lon2d :	<ARRAY of 29419776 elements>
  lat2d :	<ARRAY of 29419776 elements>
  long_name :	ABI Cloud and Moisture Imagery reflectance factor
  standard_name :	toa_lambertian_equivalent_albedo_multiplied_by_cosine_solar_zenith_angle
  _Unsigned :	true
  sensor_band_bit_depth :	12
  downsampling_method :	average
  units :	1
  resolution :	y: 0.000056 rad x: 0.000056 rad
  coordinates :	band_id_C02 band_wavelength_C02 t y x
  grid_mapping :	goes_imager_projection
  cell_methods :	t: point area: sum (interval: 0.000014 rad)
  ancillary_variables :	DQF_C02
  _FillValue_original :	-1
  _FillValue :	-1
  valid_range :	(  0, 1.299999 )

> On Jan 11, 2018, at 6:07 PM, Mary Haley <haley at ucar.edu> wrote:
> 
> 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 <mailto: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 <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 <http://testgoes.nc/>
> 
> 
> 
> 
> Tim Risner
> Operational Meteorologist
> (888) 798-9955 ext 1006 <tel:(888)%20798-9955>
> 
>  <http://www.awis.com/> <https://www.facebook.com/AWISWeatherServices/> <https://twitter.com/awisweather>
> 
> On Wed, Dec 13, 2017 at 9:02 AM, Rick Brownrigg <brownrig at ucar.edu <mailto: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 <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 <http://ncl.ucar.edu/ftp_files.shtml>
> 
> Rick
> 
> On Wed, Dec 13, 2017 at 7:35 AM, Tim Risner <trisner at awis.com <mailto: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 <tel:(888)%20798-9955>
> 
>  <http://www.awis.com/> <https://www.facebook.com/AWISWeatherServices/> <https://twitter.com/awisweather>
> 
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> 
> <goes16.png><plot_goes16.ncl><goesYXtoLatLon.ncl>

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