PGE70 Version Detail Product impact changes only
= High Impact
= Moderate Impact
= Low Impact
(Dates show approximate starting production date)
Eight-Day Global (08_E3) HDF products are produced from the Program Executable (PGE) identified as PGE70.
One may identify the maturity and quality of an HDF data product by finding the PGE (program executable) version that was used to produce the file.
This information can be obtained directly from the HDF file itself by using the
HDF utility ncdump.
The (UNIX) command is ncdump -h *.hdf | awk '/PGEVERSIONCLASS/,/END_GROUP/' .
One may also find PGE version information in the ascii text met (metadata) file associated with a particular HDF file.
Another slightly less reliable way to determine the PGE version is
through the "processing date & time" field of the HDF filename
(field #4 in L3 HDF files, see HDF Filename convention).
Users then match the processing date in the HDF filename with the
production start date for various PGE versions in blue in the listing below.
If you have any questions about this, contact Paul Hubanks.
There were no changes in the PGE70 algorithm for Collection 051; however changes in the upstream L2 products (Aerosol and Cloud) needed to be propagated into the L3 files.
To view the changes in the upstream L2 products, see the Collection 051 Change Document (linked to the right).
PGE70 v5.2.1 includes:
( Terra Forward & Reprocess: ~1.Feb.2006 )
Initial Collection 005 Version
Start of C005.
See Level-3 (L3) Eight Day change document (PDF) linked from the
Collection 005 Update
page to view Collection 004 to Collection 005 changes and improvements.