Dear Colleagues,

Here are the minutes from yesterday's SHARE meeting.  Please see the action
item at the bottom, due next Friday, 8/10/01.

NEXT MEETING: 9 am, Wednesday, August 15 in N420

Thanks,
Jerry

===============================================================================
Minutes of SHARE Meeting, 8/1/2001

Present: Gerhard Meurer, Niall Gaffney, Dorothy Fraquelli, Anton  Koekemoer,
	 Mark Dickinson, Howard Bushouse, Paolo Padovani, Jerry Kriss

1. Niall is the co-chair (with Megan Donahue) of FASST, the Future of Archive
   Services at ST.  Their charter is to investigate new ways to search/use the
   archive.  Examples:

	* With other centers, create an astronomy archive data center portal
	  to supply users with uniform access, uniform searches, and
	  graphical search results.
	* Generate "on-the-fly" catalogues using instructions/criteria
	  supplied by the user.
	* Ingest user-generated catalogues

   FASST complements SHARE, focusing on the user interface and services to
   existing data.  SHARE is looking at how we can enhance the data processing
   interface, and move it closer to the user both in terms of control and
   accessibility.

2. Gerhard talked about generating catalogues in the ACS post-processing
   pipeline.  For now will be restricted to GTO data sets.  Working out
   rules for combining data sets. 

3. Reviewed ideas from April SHARE meeting for reprocessing enhancements:

	* customized data reprocessing
	* updating WCS/better astrometry for data headers
	* registering/combining/mosaicing images
	* object detection, photometry, classification in images
	* photometric redshifts for objects

   Additional ideas added during/after discussion of the above:

	* Anton-- make mini-catalogues for single images or groups of images
	* Anton-- combine dithered spectroscopic observations
		(Paolo notes that planned enhancements to the "scrapbook"
		 facility will provide some mechanism for users to combine
		 selected spectra.)
	* Anton-- create data cubes from dithered spectroscopic observations
	* Mark-- processing based on time history; e.g., removing persistence
		 effects.

	* Dorothy-- need to enable tracing/tagging of data sets with problems.
		    Add quality control enhancements.

4. Mark made the good point that one needs to be wary of the data volume and
   processing constraints for customized reprocessing.  Also need to avoid
   potential for reprocessing efforts to migrate to a centralized system,
   which is not in synch with the modern steps toward distributed computing.

   Jerry notes that the software could be based on downloaded applets
   rather than being server-based.

   Niall suggests that a tool to indicated to a user the scientific impact of
   a given level of change in a calibration reference file would be useful.
   "Do I need to re-calibrate and repeat my previous 2-month analysis effort?"

   Dorothy notes "getref" and "bestref" run automatically as part of OTFR and
   provide current best calibration files.  But, this is just the 1st step.

5. We had a discussion that started by trying to assign scientific priorities
   to the many reprocessing enhancements listed above. Mark suggested it
   might also be good to make a separate list ordered by "tractability"
   as well.  We didn't reach a comprehensive conclusion, so I'd like
   everyone to order the bullets (asterisks) in note (3) above for both
   scientific value and potential ease of implementation; two separate lists.

   ** Please send to me by the end of next week (8/10/01), and I'll   ***
   ** compile the results for our next meeting.                       ***