SCR 3-1104

SCR 3-1104: Increase length of START_TIME & STOP_TIME keywords

Priority: high

Problem Summary

The current length of the START_TIME and STOP_TIME keywords is 24 characters which provides for a maximum time measurement to within milliseconds: CCYY-MM-DDTHH:MM:SS[.sss] MRO/HIRISE labels specify the precision of these keyword-values to within micro-seconds. The team proposes to increase the length of these keywords to 27 characters to accommodate the increased precision of the measured data and to amend the definition of these keywords in the data dictionary to reflect the modification to the formation rules. Change: Formation rule: YYYY-MM-DDThh:mm:ss[.fff]. To: Formation rule: YYYY-MM-DDThh:mm:ss[.ffffff].

Working Group

R. Joyner (lead) R. Joyner

Originator: R. Joyner

Standards Change Request

VersionDateAuthor(s)FormatNote
12007-02-07R. JoynerDOC
PDF
22007-03-19A. RaughDOC
PDF
32007-04-03A. RaughDOC
PDF

Discussion

Supplementary Material

Status

StatusDateTaskResponsible PartyResponse
SUBMITTED 2007-02-08
DRAFT 2007-03-01
RECOMMENDED 2007-04-04
APPROVED 2007-04-16
IN_IMPLEMENTATION 2007-04-16
TEST_RELEASE 2007-05-14

Votes

Vote to RECOMMEND version 1 of the SCR be moved to Implementation stage.

NodeRepresentativeVersion 1
ATMLyle Huberyes
ENSteve Hughesyes
GEOSusie Slavneyyes
IMGPatty Garciayes
NAIFBoris Semenovyes
PPITodd Kingno
RINGSMitch Gordon1yes
RSDick Simpsonno
SBNAnne Raughno

1

with a lein


Vote to RECOMMEND version 2 of the SCR for either: (a) Implementation; or (b) Management Council vote.

NodeRepresentativeVersion 2
ATMLyle Huber1no
ENRon Joynerno
GEOSusie Slavneyyes
IMGPatty Garcia2yes
NAIFBoris Semenovnot present
PPITodd King3no
RINGSMitch Gordon4no
RSDick Simpson5no
SBNAnne Raughyes

1

ATMOS says nay to both options a and b. 50 characters?

2

(to implementation stage); Although I still believe it would be better to increase the length of the entire class rather than taking this one-by-one approach, which only serves to introduce more inconsistencies.

3

The increase to 50 characters means that we can represent fractional seconds to 30 decimal places. This seems to be capricious. A total length of 27-30 seems much more justifiable.

4

option a.

5

I, like Todd, am not quite ready to see values with 10^-29 second precision


Vote to RECOMMEND version 3 of the SCR for either: (a) Implementation; or (b) Management Council vote.

NodeRepresentativeVersion 3
ATMLyle Huberyes
ENSteve Hughesyes
GEOSusie Slavneyyes
IMGPatty Garciayes
NAIFBoris Semenovnot present
PPITodd Kingyes
RINGSMitch Gordonyes
RSDick Simpsonno
SBNAnne Raughyes