Calibration Version keywords
A keyword for calibration version keywords are included in level-1 data (CALVER32) through higher level products (CALVER64) starting in August 2012. This keyword is, at the start, considered to be a set of fields consisting of single hexidecimal digits.
The presently assigned values are from least significant nibble:
Field |
bits |
mask |
name |
Note |
0 |
0-3 |
0x0F |
HFCORRVR |
Height of formation code version used to find disk center. Vers 2 for all data to date. |
1 |
4-7 |
0xF0 |
CROTA2VR |
Version of CROTA2 in the Master pointing table. Vers 0 prior to Transit of Venus, then 1. |
The default value of CALVER64 is 0 and should never be seen. The concept of a missing value for a CALVERxx field does not make sense since CALVERxx refers to the version of code or source of values vs the decisions made by that code. If for instance the limb fit fails in lev1 processing, HFCORRVR still should contain the code version but the appropriate QUALITY bit should show that that code could not produce a useful value.
Prior to Aug 2012 hmi.lev1 had a keyword named HFCORRVR which can be taken as correct for fields 0 and 1 except that a 0 in the first nibble (field 0) should be changed to 2 to match the other records made with same code.
In the process of adding CALVER64 and CALVER32 for existing records these keywords should be set to 0x12 when updated with the post TOV CROTA2 values. The plan for doing the August 2012 update is described at Crota2UpdatePlan.