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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Users of the IDD NIMAGE feed products:
Reminder:
Tomorrow, Thursday, June 23, a new set of GLM composite products will
be added to the IDD NIMAGE feed. The new GLM products are similar but
not identical to the GLM products that are currently being distributed
in the NIMAGE feed - see below for details on how the products differ.
Why are the new GLM images being added?
The grant that has funded the creation of the Texas Tech University
(TTU) GLM products is due to expire on July 21. The new NOAA Virtual Lab
(Vlab) GLM products are intended to be a replacement for the TTU products.
What are the differences in the TTU and Vlab GLM products?
The Vlab products differ from the TTU products in several ways:
- the TTU products have GOES-East CONUS and FullDisk coverages while
the Vlab products have GOES-East and GOES-West FullDisk coverages
- the TTU products contain Level2 fields while there are Level2 and
Level3 fields in the Vlab products
The TTU Level2 products contain 8 2-dimenstional fields:
flash_extent_density
flash_centroid_density
average_flash_area
total_energy
group_extent_density
group_centroid_density
average_group_area
minimum_flash_area
The Vlab Level2 products contain 3 2-dimensional fields:
Flash_extent_density
Total_Optical_energy
Minimum_flash_area
and 6 1-dimensional fields of parallax corrected flash points:
flash_lat
flash_lon
flash_area
flash_energy
flash_time
flash_duration
The Vlab Level2 fields represent 1-minute accumulations of the
respective variable and are updated every minute.
The Vlab Level3 products contain 3 2-dimensional fields:
Flash_extent_density_w5u1
Total_Optical_energy_w5u1
Minimum_flash_area_w5u1
The Vlab Level3 fields represent 5 minute averages of the respective
variable and are updated every minute.
How can I differentiate the new Vlab products from the TTU products?
The LDM/IDD Product IDs for the TTU and Vlab products differ in the
directory portion of the product pathname which is used as the Product
ID, but not in the product name itself:
For example:
TTU FullDisk Level2 Product Id:
/data/ldm/pub/native/satellite/GOES/GOES16/Products/GeostationaryLightningMapper/FullDisk/20200122/OR_GLM-L2-GLMF-M3_G16_s20200222155000_e20200222156000_c20200222156450.nc
Vlab FullDisk Level2 Product Id:
/data/ldm/pub/native/satellite/GOES/GOES16/Products/GLMISatSS/Level2/FullDisk/20220617/OR_GLM-L2-GLMF-M6_G16_s20221682221000_e20221682222000_c20221682221300.nc
Vlab FullDisk Level3 Product Id:
/data/ldm/pub/native/satellite/GOES/GOES16/Products/GLMISatSS/Level3/FullDisk/20220617/OR_GLM-L3-GLMF-M6_G16_s20221682217000_e20221682222000_c20221682219300.nc
NOTE:
Since the product names for the Vlab and TTU products follow the GOES-R
ground station naming convention, one's LDM pattern-action file action(s)
that processes GLM products must differentiate between the TTU and Vlab
products using the directory component of the Product IDs. Since the
Vlab products differ from the TTU products, it will be important to
write the products into separate areas on disk.
Please send any questions/comments about this addition to the IDD NIMAGE
feed to:
Unidata User Support <support@xxxxxxxxxxxxxxxx>
Best regards,
Unidata User Support
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