EVP Dataset Representation History

This section lists all of the versions of the EVP dataset representation that exist within COMPASS. The dataset representation number is used to delineate different versions of the EVP dataset definition. Its value for a particular dataset can be found in the dataset descriptor (DSD).

• Dataset Representation 0
  Preflight data, 172 bytes per record. Some calibration data exists in this format. Not used after Feb 1991.

• Dataset Representation 1
  Coincides with the delivery of EVPRNN 4. The first flight data used this format. In effect from Feb 1, 1991 to Aug 17, 1992. This data was compacted to be only 68 bytes per record. It was later found that this data has incorrect EHORA.

• Dataset Representation 2
  Coincides with the delivery of EVPRNN 10, the correction of the EHORA. In effect from 17 Aug 1992 to 5 Oct 1993. This is also 68 bytes per record.

• Dataset Representation 3
  Coincides with EVPRNN 12, which incorporated an improved ToF correction. It has been in effect since Oct 5, 1993. It is also 68 bytes per record.

Last Update: February 17, 1998