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MOD05_L2 (Water Vapor Product)
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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 = High Impact     Moderate Impact = Moderate Impact     Low 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.

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