Ticket #300 (closed design issue: fixed)

Opened 11 years ago

Last modified 11 years ago

Do we need x,y,z components of (ra, decl) in Source table?

Reported by: jbecla Owned by: TimAxelrod
Priority: trivial Milestone:
Component: dbSchema Keywords:
Cc: Blocked By:
Blocking: Project: LSST
Version Number:
How to repeat:

not applicable

Description

Do we need cx,cy,cz in the Source table (x, y and z components of the (ra, decl) unit vector). If so, do we need to keep errors for each?

Change History

comment:1 Changed 11 years ago by TimAxelrod

  • Type changed from defect to design issue

comment:2 Changed 11 years ago by TimAxelrod

  • Status changed from new to assigned

comment:3 Changed 11 years ago by jbecla

  • Component changed from unknown to dbSchema

comment:4 Changed 11 years ago by ktl

After discussion with Tim, it seems unlikely that cx, cy, cz are needed for Sources. They will mostly be used for Objects, and they are relatively easy to recalculate from ra/decl if needed.

comment:5 Changed 11 years ago by ktl

Also, use of cx, cy, cz may be even more limited if we pre-compute a Neighbors table.

comment:6 Changed 11 years ago by TimAxelrod

  • Status changed from assigned to closed
  • Resolution set to fixed

I think we don't need them.

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