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Hello,"ID" and "LID" are two of the columns output by PHOT.I had assumed that one of those two would be the same value as
"ID" in the .coo file input to PHOT. Perhaps the fact that the
column in between ID and LID is the input .coo filename led me to
that notion. Instead I'm finding that both ID and LID are the same value, equal to the
row number in the PHOT output table.Am I missing something in my use of DAOFIND and PHOT that would have
accomplished the carryover of the .coo ID into the PHOT output?Of course I can add a step to my process to accomplish this, but I'm
curious if there is a trick that I'm missing in the use of these
tasks.Thanks,
Ed Smithp.s. My .coo input to phot is a subset of the rows of the .coo file output by
daofind, thus there is a mismatch between row number and ID.

Hello Eric,>"ID" and "LID" are two of the columns output by PHOT.
>
>I had assumed that one of those two would be the same value as
>"ID" in the .coo file input to PHOT. Perhaps the fact that the
>column in between ID and LID is the input .coo filename led me to
>that notion.
>
>Instead I'm finding that both ID and LID are the same value, equal to the
>row number in the PHOT output table.
>
>Am I missing something in my use of DAOFIND and PHOT that would have
>accomplished the carryover of the .coo ID into the PHOT output?
>
>Of course I can add a step to my process to accomplish this, but I'm
>curious if there is a trick that I'm missing in the use of these
>tasks.In the phot task output ID is the sequence number of the object being measured
and always goes from 1 to N. Note that the object may be defined in an input
coordinate file (interactive or batch mode) or interactively with the cursor
(interactive mode). This mixed mode operation makes it difficult to inherit
an ID from the coordinate file. LID is the sequence number in the input
coordinate file and should be 0 for objects measured interactively. Note
that it is possible in interactive mode to measure the same object twice
in which case LID should be the same but not ID. LID is a sequence number
rather than an original coordinate file ID because phot currently only
requires an x and y value for each object in the input list.
>
>p.s. My .coo input to phot is a subset of the rows of the .coo file output by
> daofind, thus there is a mismatch between row number and ID.
>In this case the original ID in the daofind file is lost and the numbering
begins at 1. You can use the prenumber or pcalc tasks to renumber the objects
in the phot output file.Hope this helps.
Regards,
Lindsey Davis