[Met_help] [rt.rap.ucar.edu #95161] History for Fwd: Questions about L3 AOD data

Tue Oct 13 16:25:31 MDT 2020

----------------------------------------------------------------
  Initial Request
----------------------------------------------------------------

To Whom It May Concern:

Our NESDIS data provider is asking us how much information (attributes) are
needed in the netcdf file for MET to ingest?  They have the document of
CF-convention netCDF.  The degree of attributes information from using
point2grid for CMAQ and HYSPLIT regridding are different as shown in the
attachments.

NESDIS aerosol group is in the process of generating hourly VIIRS L3
gridded AOD file in netCDF format for GEFS-Aerosol and regional AOD
verification.  Thus, they want to embed adequate information for MET.

Ho-Chun Huang

IMSG at NOAA/NWS/NCEP/EMC

5830 University Research Ct., Rm. 2792

College Park, MD 20740

Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>

301-683-3958

---------- Forwarded message ---------
From: Hongqing Liu - NOAA Affiliate <hongqing.liu at noaa.gov>
Date: Mon, May 4, 2020 at 11:12 AM
Subject: Questions about L3 AOD data
To: Ho-Chun Huang <Ho-Chun.Huang at noaa.gov>

Hello Ho-Chun,

The VIIRS AOD team is starting to prepare the Level-3 gridded data for
the GEFS-aerosol and Regional AQM requests. Shobha has shown us the
NetCDF file requirements (attached), and I believe there are some
established rules for setting up the NetCDF global/variable attributes
such that the models can interpret them correctly. Since I have no
experience with the operational products,  your guidance would be
greatly appreciated.

I have put the NetCDF variables and global attributes in the attaced
tables (VIIRS_L3_NetCDF_Attr.docx). My initial questions are:

1. Do we need to keep all those attributes? I noticed that some of them
might be GOES-R ABI specific, and not applicable to VIIRS.

2. Where to find the definitions of those attributes? Is there a
document/convention must be followed to fill in those attributes?

3. Two sample files (in the requirement file) have different global
attributes, is it appropriate to follow the "HYSPLIT gridded netCDF
file" only?

Thank you very much! Your timely help would be greatly appreciated.

Hongqing Liu

-- 
5825 University Research Court, Suite 3250
NOAA/NESDIS, Center for Satellite Applications and Research
College Park, MD 20740

Phone: 301-683-2581
Fax:   301-763-8108

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  Complete Ticket History
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Subject: Fwd: Questions about L3 AOD data
From: Julie Prestopnik
Time: Tue May 05 12:16:06 2020

Hi Ho-Chun.  I have assigned this ticket to Howard.  Please allow a
few
business days for a response.  Thank you!

Julie

On Tue, May 5, 2020 at 8:04 AM Ho-Chun Huang - NOAA Affiliate via RT <
met_help at ucar.edu> wrote:

>
> Tue May 05 08:03:55 2020: Request 95161 was acted upon.
> Transaction: Ticket created by ho-chun.huang at noaa.gov
>        Queue: met_help
>      Subject: Fwd: Questions about L3 AOD data
>        Owner: Nobody
>   Requestors: ho-chun.huang at noaa.gov
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=95161 >
>
>
> To Whom It May Concern:
>
> Our NESDIS data provider is asking us how much information
(attributes) are
> needed in the netcdf file for MET to ingest?  They have the document
of
> CF-convention netCDF.  The degree of attributes information from
using
> point2grid for CMAQ and HYSPLIT regridding are different as shown in
the
> attachments.
>
> NESDIS aerosol group is in the process of generating hourly VIIRS L3
> gridded AOD file in netCDF format for GEFS-Aerosol and regional AOD
> verification.  Thus, they want to embed adequate information for
MET.
>
> Ho-Chun Huang
>
> IMSG at NOAA/NWS/NCEP/EMC
>
> 5830 University Research Ct., Rm. 2792
>
> College Park, MD 20740
>
> Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>
>
> 301-683-3958
>
>
> ---------- Forwarded message ---------
> From: Hongqing Liu - NOAA Affiliate <hongqing.liu at noaa.gov>
> Date: Mon, May 4, 2020 at 11:12 AM
> Subject: Questions about L3 AOD data
> To: Ho-Chun Huang <Ho-Chun.Huang at noaa.gov>
>
>
> Hello Ho-Chun,
>
> The VIIRS AOD team is starting to prepare the Level-3 gridded data
for
> the GEFS-aerosol and Regional AQM requests. Shobha has shown us the
> NetCDF file requirements (attached), and I believe there are some
> established rules for setting up the NetCDF global/variable
attributes
> such that the models can interpret them correctly. Since I have no
> experience with the operational products,  your guidance would be
> greatly appreciated.
>
> I have put the NetCDF variables and global attributes in the attaced
> tables (VIIRS_L3_NetCDF_Attr.docx). My initial questions are:
>
> 1. Do we need to keep all those attributes? I noticed that some of
them
> might be GOES-R ABI specific, and not applicable to VIIRS.
>
> 2. Where to find the definitions of those attributes? Is there a
> document/convention must be followed to fill in those attributes?
>
> 3. Two sample files (in the requirement file) have different global
> attributes, is it appropriate to follow the "HYSPLIT gridded netCDF
> file" only?
>
> Thank you very much! Your timely help would be greatly appreciated.
>
> Hongqing Liu
>
> --
> 5825 University Research Court, Suite 3250
> NOAA/NESDIS, Center for Satellite Applications and Research
> College Park, MD 20740
>
> Phone: 301-683-2581
> Fax:   301-763-8108
>
>

--
Julie Prestopnik
Software Engineer
National Center for Atmospheric Research
Research Applications Laboratory
Phone: 303.497.8399
Email: jpresto at ucar.edu

My working day may not be your working day.  Please do not feel
obliged to
reply to this email outside of your normal working hours.

------------------------------------------------
Subject: Fwd: Questions about L3 AOD data
From: Howard Soh
Time: Wed May 06 11:36:53 2020

Some attributes were inherited from model data (regrid_data_plane).

The attributes from "project" are GOES metadata which were saved for
the reference purpose. They are not required to run MET. Please
replace them with VIIRS specific attributes.

The global attributes related with projection are required.
MET_version and MET_tool attributes are for MET. These attributes are
indicator that the file was generated by MET tools. FileOrigins and
RunCommand attributes are useful information (how the NetCDF file was
generated) for the trouble shooting.

The init_time, init_time_ut, valid_time, and valid_time_ut were
inherited from model data. Please set those attributes to the
observation time.
The level attribute "*,*" implies no slicing from the input data
(attribute for reference, not required).

Cheers,
Howard

On Tue May 05 12:16:06 2020, jpresto wrote:
> Hi Ho-Chun.  I have assigned this ticket to Howard.  Please allow a
> few
> business days for a response.  Thank you!
>
> Julie
>
> On Tue, May 5, 2020 at 8:04 AM Ho-Chun Huang - NOAA Affiliate via RT
<
> met_help at ucar.edu> wrote:
>
> >
> > Tue May 05 08:03:55 2020: Request 95161 was acted upon.
> > Transaction: Ticket created by ho-chun.huang at noaa.gov
> >        Queue: met_help
> >      Subject: Fwd: Questions about L3 AOD data
> >        Owner: Nobody
> >   Requestors: ho-chun.huang at noaa.gov
> >       Status: new
> >  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=95161
> > >
> >
> >
> > To Whom It May Concern:
> >
> > Our NESDIS data provider is asking us how much information
> > (attributes) are
> > needed in the netcdf file for MET to ingest?  They have the
document
> > of
> > CF-convention netCDF.  The degree of attributes information from
> > using
> > point2grid for CMAQ and HYSPLIT regridding are different as shown
in
> > the
> > attachments.
> >
> > NESDIS aerosol group is in the process of generating hourly VIIRS
L3
> > gridded AOD file in netCDF format for GEFS-Aerosol and regional
AOD
> > verification.  Thus, they want to embed adequate information for
MET.
> >
> > Ho-Chun Huang
> >
> > IMSG at NOAA/NWS/NCEP/EMC
> >
> > 5830 University Research Ct., Rm. 2792
> >
> > College Park, MD 20740
> >
> > Ho-Chun.Huang at noaa.gov <Joe.Smith at noaa.gov>
> >
> > 301-683-3958
> >
> >
> > ---------- Forwarded message ---------
> > From: Hongqing Liu - NOAA Affiliate <hongqing.liu at noaa.gov>
> > Date: Mon, May 4, 2020 at 11:12 AM
> > Subject: Questions about L3 AOD data
> > To: Ho-Chun Huang <Ho-Chun.Huang at noaa.gov>
> >
> >
> > Hello Ho-Chun,
> >
> > The VIIRS AOD team is starting to prepare the Level-3 gridded data
> > for
> > the GEFS-aerosol and Regional AQM requests. Shobha has shown us
the
> > NetCDF file requirements (attached), and I believe there are some
> > established rules for setting up the NetCDF global/variable
> > attributes
> > such that the models can interpret them correctly. Since I have no
> > experience with the operational products,  your guidance would be
> > greatly appreciated.
> >
> > I have put the NetCDF variables and global attributes in the
attaced
> > tables (VIIRS_L3_NetCDF_Attr.docx). My initial questions are:
> >
> > 1. Do we need to keep all those attributes? I noticed that some of
> > them
> > might be GOES-R ABI specific, and not applicable to VIIRS.
> >
> > 2. Where to find the definitions of those attributes? Is there a
> > document/convention must be followed to fill in those attributes?
> >
> > 3. Two sample files (in the requirement file) have different
global
> > attributes, is it appropriate to follow the "HYSPLIT gridded
netCDF
> > file" only?
> >
> > Thank you very much! Your timely help would be greatly
appreciated.
> >
> > Hongqing Liu
> >
> > --
> > 5825 University Research Court, Suite 3250
> > NOAA/NESDIS, Center for Satellite Applications and Research
> > College Park, MD 20740
> >
> > Phone: 301-683-2581
> > Fax:   301-763-8108
> >
> >

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