Known time desc » History » Revision 20
Revision 19 (Anonymous, 08/07/2016 10:55 AM) → Revision 20/31 (Anonymous, 08/07/2016 10:55 AM)
h1. Known time description
h2. Double Time ranges : date from 01/01/1970 to 01/01/2100
* seconds from 01/01/1970 00:00:00 : 0 to 4 102 488 000
* milliseconds from 01/01/1970 00:00:00 : 0 to 4 102 488 000 000 (ambiguity for the first 48days of 1970 with previous time format)
* seconds from 01/01/0000 00:00:00 : 62 168 472 000 to 66 270 960 000 (no ambiguity)
* milliseconds from 01/01/0000 00:00:00 : 62 168 472 000 000 to 66 270 960 000 000 (no ambiguity)
* seconds from 01/01/2000 00:00:00 : - 946 728 000 to 3 155 760 000 (TT2000)
* milliseconds from 01/01/2000 00:00:00 : - 946 728 000 000 to 3 155 760 000 000 (ambiguity with TT2000 in seconds?)
h2. Known time description
|_.Mission Name |_.time var name |_. units |_.DEPEND |_.LABLAXIS|_.FIELDNAM |_.CATDESC |_.Type |_.VIRTUAL|_.nb of records|_.VAR_NOTES|
|Cluster FGM |time_tags__CDFNAME |ms |0 |UT |Universal Time |Interval centred time tag |CDF_EPOCH | |normal |field missing|
|Cluster HIA |time_tags__CDFNAME |ms |0 |UT |Center Time |Interval centred time tag |CDF_EPOCH | |normal |field missing|
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|Themis Efi,SCM |VARNAME_time |sec |TIME |UT |Same as time var name|UTC, in seconds sinc 01-Jan-1970 00:00:00|CDF_DOUBLE | |normal |Unleaped seconds|
|Themis Efi,SCM |VARNAME_epoch |field missing|0 |UT |Same as time var name|Unrelated |CDF_EPOCH |true |0 |field missing|
|Themis Efi,SCM |VARNAME_dot0_epoch0|msec |EPOCH0 |UT |Same as time var name|EPOCH of THEMIS time base |CDF_EPOCH | |1 |EPOCH of 01-Jan-1970 00:00:00|
|Themis Esa |VARNAME_time |sec |TIME |UT |Same as time var name|UTC, in seconds sinc 01-Jan-1970 00:00:00|CDF_REAL8 | |normal |Unleaped seconds|
|Themis Esa |VARNAME_epoch |field missing|0 |UT |Same as time var name|Unrelated |CDF_EPOCH |true |0 |field missing|
|Themis Esa |VARNAME_dot0_epoch0|msec |EPOCH0 |UT |Same as time var name|EPOCH of THEMIS time base |CDF_EPOCH | |1 |EPOCH of 01-Jan-1970 00:00:00|
|Themis Peer |VARNAME_time |sec |TIME |UT |Same as time var name|UTC, in seconds sinc 01-Jan-1970 00:00:00|CDF_DOUBLE | |> data |Unleaped seconds|
|Themis Peer |VARNAME_epoch |field missing |0 |UT |Same as time var name|VARNAME |CDF_EPOCH | |normal |field missing|
|Themis Peer |VARNAME_epoch0 |msec |EPOCH0 |timebase |Same as time var name|EPOCH of THEMIS time base |CDF_EPOCH | |1 |EPOCH of 01-Jan-1970 00:00:00|
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|MMS fpi |Epoch (absent, Epoch_minus_var is present) |s |0 |Field missing | VARNAME|VARNAME |CDF_UINT1 | |1 |VARNAME|
|MMS scm |epoch_timetag |ns |0 |VARNAME |Same as time var name|Packet time time |CDF_TIME_TT2000| |normal |field missing|
|MMS scm |Epoch (other var time) |ns |0 |VARNAME |Same as time var name|Time |CDF_TIME_TT2000| |normal |field missing|
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|ACE mfi |Epoch |ms |0 |VARNAME |Time |Time ,beginning of interval |CDF_EPOCH | |normal |field missing|
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|Helios nessmag |Epoch |ms |0 |field missing |Epoch |Default Time |CDF_EPOCH | |normal |field missing|
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|Ulysses hft |Epoch |ms |0 |Time |Epoch |Time in NSSDC Epoch format |CDF_EPOCH | |normal |field missing|
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|SOHO cst |Epoch |ms |0 |Epoch |Time Line |Time |CDF_EPOCH | |normal |field missing|
h2. Algorithm Proposition
VariableThatNeedsTime
depend0 = get(VariableThatNeedsTime.DEPEND_0 variable)
if(depend0.nbOfRec == VariableThatNeedsTime.nbOfRec)
* test *test depend0.firstValue for different double range mentionned above (this part might include CDF_TYPE for TT2000)
* if(ambiguity) *if(ambiguity)
** look **look at depend0.units
** if **if field is missing, look at VariableThatNeedsTime.depend_epoch0.units field
else
dependTime = get(VariableThatNeedsTime.DEPEND_TIME variable)
if(dependTime.nbOfRec == VariableThatNeedsTime.nbOfRec)
* test *test dependTime.firstValue for different double range mentionned above (this part might include CDF_TYPE for TT2000)
* if(ambiguity) *if(ambiguity)
** look **look at dependTime.units