General PGE Information
The MOD05_L2 and MYD05_L2 products are produced from the Program Executable (PGE) identified as PGE04.
To determine the current PGE04 version that has completed:
1) baseline procedure,
2) integration & testing, and
3) MODAPS operations implementation, visit the
PGE Status Chart.
For information on reconciling Algorithm process version and PGE version, visit the
PGE04 Version History File.
Tool/Command for PGE Determination
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 for finding the PGE version that was used to create a particular HDF file is
ncdump -h *.hdf | awk '/PGEVERSIONCLASS/,/END_GROUP/'
One may also find PGE version information in the ascii met (metadata) file associated with a particular HDF file.
PGE04 Algorithm Version History - Product Impact Changes
= High Impact
= Moderate Impact
= Low Impact
(Dates show approximate starting production date)
Latest PGE04 Version
v4.2.2 (Operational: ~1.Jan.2004)
No Changes to the Water Vapor Algorithm in Data Collection 003 or 004.