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wiki:Zoology

Version 34 (modified by Serge CHASTEL, 15 years ago) ( diff )

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  1. Sort of Introduction
    1. Idiosyncratic Definitions
    2. Related Wikipages
  2. #5: 2011-08-26
  3. #4: 2011-08-25
  4. #3: 2011-08-24
  5. #2: 2011-08-23
  6. #1: 2011-08-22

Sort of Introduction

Idiosyncratic Definitions

(Let's talk about the same things...)

We have files containing detections (the positives). They have been verified against Sloan. If they were in Sloan, they are true positives or matched. If they are not, they are false positives or unmatched. With detections come with features. Features can be numeric (ra, dec...), alphanumeric (skycell, filter...).

I don't see anything else for the moment.

Related Wikipages

The main wikipages are:

#5: 2011-08-26

Attendees: Heather, Roy, Serge, Gene,

The purpose of the meeting is to answer these three questions:

  1. How are the detection features built? a) For floating-point values; b) for binary values (flags);
  2. How can the flags be used to tell if a detection is "good" or "bad" or better, (since it implies the definition of "good" or "bad") which hints could be given to users to judge about the detection features quality?
  3. Can we make sensible cuts using x_psf, y_psf, ext_nsigma,

psf_inst_flux, psf_inst_flux_sigma or some combination of those (or by using other fields)?

#4: 2011-08-25

Attendees: Heather, Roy, Serge, Jim

Actions

  • A-008 (Heather):Done Once A-005 is done, check flux_sig/flux ratio for true positive
  • A-009 (See details): Answer Gene's questions:
    • 1) (Serge/Heather for plots) What fraction of the detections have flux / flux_sig < 5 (the nominal cutoff) or < 3 (a possible agressive cutoff)?;
    • 2) (Serge/Roy/Heather) What is the spatial distribution of these detections?
    • 3) (Who?) What does the histogram of pixel value / sqrt(pixel variance) look like in areas / cells with large numbers of these detections? Should be a Gaussian with a width of 1, but if there is excess noise from the camera in some areas, the width will be > 1 (we underestimate the variance).
  • A-010 (Roy): Is the false detections filter dependent?
  • A-011 (Roy/Heather for plots): Classify "matched": statistics similar to the unmatched (flags, flags2, flux_sig/flux ratio histogram, anything else)
  • A-012 (Roy): Build DS9 region files for "matched" detections with bad flags (see Heather for details, will help answering Gene's questions)
  • A-013 (?): Comments/Open Questions
    • 1) How were the "unmatched" detections defined?
    • 2) What has been missed from the Sloan detections?
    • 3) Using the flags we cut about 2/3 of the good detections

Pending Actions

#3: 2011-08-24

Attendees: Heather, Roy, Serge, (Bill invited himself because we were noisy and gave info about processing)

Pending Actions

  • A-002 (Serge): Done Create a database with: all values taken from the footprint-<filter>-not-matched-psphot.fits files. Add columns filter, stack_id, skycell_id. See /data/ipp009.0/heather/heather.blog.txt .
  • A-003 (All): Done Identify false positives which have been correctly set as "having a problem" (see flags meaning at ​http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/cmf_columns )

Actions

  • A-004 (Serge): Create the database again on ipp001 (neverland is almost full)
  • A-005 (Serge): Ingest the full detections on ipp001 (in an another table)
  • A-006 (Roy): Update ​http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/ZoologyInvestigations with the flux_sig/flux ratio explanation
  • A-007 (Heather): Make histograms of flux_sig/flux ratio.
  • A-008 (Who?): Once A-005 is done, check flux_sig/flux ratio for true positive
  • A-009 (Who?): Answer Gene's questions:
    • 1) What fraction of the detections have flux / flux_sig < 5 (the nominal cutoff) or < 3 (a possible agressive cutoff)?;
    • 2) What is the spatial distribution of these detections?
    • 3) What does the histogram of pixel value / sqrt(pixel variance) look like in areas / cells with large numbers of these detections? Should be a Gaussian with a width of 1, but if there is excess noise from the camera in some areas, the width will be > 1 (we underestimate the variance).
  • A-010 (heather): Is it filter dependent?

#2: 2011-08-23

Attendees: Heather, Roy, Serge

Heather wrote some doc here: ​http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/ZoologyHints

Pending Actions

  • A-001 (Heather): Done Provide FITS files where false positives can be displayed and underlined using ds9.

Actions

  • A-002 (Serge): Create a database with: all values taken from the footprint-<filter>-not-matched-psphot.fits files. Add columns filter, stack_id, skycell_id. See /data/ipp009.0/heather/heather.blog.txt .
  • A-003 (All): Identify false positives which have been correctly set as "having a problem" (see flags meaning at ​http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/cmf_columns )

#1: 2011-08-22

Attendees: Heather, Roy, Serge

Heather talked about the problem. She already has wikipages showing some of them:

Actions

  • A-001 (Heather): Provide FITS files where false positives can be displayed and underlined using ds9.

Previous Actions

  • None

Next meeting: as soon as A-001 has been completed.

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