Current Tasks for the IPP Team

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KPAT / DRAVG Priority Issues (+ Notes)

• latency
  • we have performed a throughput demonstration which meets requirements.

• magic masking
  • the latest large-scale run had a median streak count of 8.
  • we need to make an assessment of the current state of masking by masking bit (both warp and chip)
    • Heather has made an initial assessment of the masking using ~100 individual chips and warps. If this was done for 100 chip Files (not chip Runs) and equivalently for warps, then we need more statistics to say something useful.

• stacking: noise correlation
  • we believe this has been addressed by Paul's recent work
    • we need an independent assessment if this is still an issue
  • Nigel is concerned about the photometry of psfs in the stacks
    • Nigel and Paul have both been investigating the situation. Some conclusions:
      1. the latest version of the code (eg, stack_id 25532) results in scatter in psf magnitudes which are larger than the warp-warp photometry (0.04 vs 0.03).
      2. the aperture magnitudes seem to be in better agreement, which says the pixels are probably OK
      3. Paul started to use simtest to verify the quality of the pixel photometry

• diff images: residuals and noise correlation
  • we have made some good progress on this with the dual convolution technique, and will generate a set of test images this week.
    • this is critical : as of 2009/11/23 this has not been done
  • another significant source of residuals comes from poor astrometry
    • Gene has investigated the astrometry failures and improved the analysis (outlier clipping). Also, several cases of poor astrometry resulted from stars being falsely identified as cosmic rays and the wings being used in the fit instead. this should now be fixed in psphot.
  • we also also working on improving the quality of the detection analysis and the associated photometry in the diff images
    • Gene will be making this top priority again week of 2009/11/23 (this has been on the back burner while the astrometry issues were studied)

• astrometry: some catastrophic failures (offsets>3")
  • some progress made in some extreme fields (M42). this may also result in improvements in other poor situations. otherwise under investigation.
  • Gene has included a number of fixes. there is a bit more work to make sure the warps do not use poor astrometry results.

• xtalk artifacts.
  • for the near term, we will address this by masking the worst offenders in the camera masking stage.
  • still need to pin down the xtalk rules, but we can implement the xtalk we know.
  • as of 2009/11/23, this xtalk masking has been implemented by Chris, but with only limited testing to date.

• other image artifacts.

• photometric calibration

• star/galaxy separation
  • Eddie has made some plots of the quality of the current S/G flag: PS1_rates. The rules still need to be tweaked.

Other Near-Term Goals

• address warp failures (photometry problem on 3 warps in throughput test)
• someone needs to put together code that feeds back quality info to summit

Eugene Magnier

• psphot & difference images
• flat-field correction
  • run more flattests
• zero points -- use 'blue edge' and full camera
• extended sources
  • set upper limits on Petrosian radii
  • make sure new structures are linked into output functions
  • generate a more complete test set & run tests
• minor ippMonitor & DVO issues
• more data organization work on Manoa & MHPCC clusters
• ingest giebink stuff into svn trunk

Heather Flewelling

• MD08 (& other MD) stacks
• more magic evaluation
• megacam -> nebulous
• simtest work (consistency, etc)
• sdss photometry comparison (start with flat-field correction tests)

Bill Giebink

• DIMM work
• psLib & psModules test code
• build a "realtest"

Paul Price

• check stack code to trunk
• run dual-diffs tests
• examine other pending tasks

Bill Sweeney

• distribution
  • cleanup
  • add label ability to client
• pstamp
  • select different data products
  • cleaned runs (need to fix labeling for update issues)
  • enhance web interface with new features

Chris Waters

• xtalk implementation
• data quality feedback to OTIS
• nebulous
  • unavailable instances errors still outstanding
  • replicate bug & random machine replication
• assessment of stacking detection limits

Natalia Primak

• simtest input / output consistency checks
• simtest visualizations

Cindy Giebink & Steph Mohr

• ready to turn on replication of gpc1, with some research
• memory tests
• memory swaps on ipp005, etc.