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SVA1 Data Analysis » History » Version 75

Alex Drlica-Wagner, 09/15/2014 06:55 AM

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h1. SVA1 Data Analysis
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This wiki page will record information gleaned from the biweekly Monday SVA1 Analysis telecon.  In the end, this will build up a compilation of best-practices and systematics for different magnitudes; star/galaxy separation; photometric zeropoints; masking; etc.
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The SVA1 email listserve is: des-sva1@fnal.gov
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h2. Telecon Information
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Call-in instructions:
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1. Dial Toll-Free Number: 866-740-1260 (U.S. & Canada)
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2. International participants dial:
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Toll Number: 303-248-0285
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Or International Toll-Free Number: http://www.readytalk.com/intl
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UK: 0800 496 0576
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3. Enter your 7-digit access code, followed by “#”
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Your access code: 7691719
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[[Agenda And Minutes for 10/14, 10am CDT]]
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[[Agenda And Minutes for 10/28, 10am CDT]]
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[[Agenda And Minutes for 11/11, 10am CST]]
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[[Agenda And Minutes for 11/25, 10am CST]]
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[[Agenda And Minutes for 12/09, 10am CST]]
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[[Agenda And Minutes for 12/18, 10am CST]]
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[[Agenda And Minutes for 1/22, 10am CST]]
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[[Agenda And Minutes for 2/3, 10am CST]]
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[[Agenda And Minutes for 3/3, 10am CST]]
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[[Agenda And Minutes for 3/17, 10am CDT]]
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[[Agenda And Minutes for 3/31, 10am CDT]]
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[[Agenda And Minutes for 4/14, 10am CDT]]
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[[Agenda And Minutes for 4/28, 10am CDT]]
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[[Agenda And Minutes for 5/12, 10am CDT]]
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[[Agenda And Minutes for 6/9, 10am CDT]]
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[[Agenda And Minutes for 6/23, 10am CDT]]
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[[Agenda And Minutes for 7/21, 10am CDT]]
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[[Agenda And Minutes for 8/4, 10am CDT]]
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[[Agenda And Minutes for 8/18, 10am CDT]]
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[[Agenda And Minutes for 9/15, 10am CDT]]
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h2. Gold Catalog v1.0
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The [[SVA1 Gold Catalog v1.0]] is described here.
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[[Is something going wrong with errors on MAG_AUTO?]]
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[[Odd magnitudes in ELG selection]]
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h2. Completeness Tests
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[[Testing Completeness with UFIG]]
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[[Testing Completeness with Shallow SN Field Coadds]]
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[[Galaxy Completeness Estimate with SN Field Coadds]]
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h2. Astrometry
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[[Relative Astrometry in SVA1 Finalcut]]
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[[Fixing Astrometry in SVA1 Finalcut]]
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[[Fixed Astrometry in SVA1 Finalcut]]
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h2. Punch List
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[[SVA1 Catalog Punch List]]
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h2. Which Magnitudes?
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DETMODEL for colors...
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h2. Star/Galaxy Separation
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The [[SG separation challenge]].
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On this page, you can find some results of tests on the COSMOS field, including star/galaxy separation.
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https://cdcvs.fnal.gov/redmine/projects/des-lss/wiki/Systematics_tests
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Some studies on star/galaxy separation for final cut and coadd objects in the SN fields "S/G SVA1 SN fields":http://des-docdb.fnal.gov:8080/cgi-bin/ShowDocument?docid=7448
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Some interesting spread model maps are at [[Spread Model Maps]]
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and [[A Modest Proposal for Preliminary Star/Galaxy Separation]] (Eli)
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with [[Bright Galaxy Impurity]]
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and [[Bright Star Spread Model Issues]].
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and [[Tile dependence of star-galaxy classification]]
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and [[Tile dependence of PSF in the SN Field Coadds]]
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Problematic issues when [[Comparing to Homogenized Coadds]]
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And a follow up on [[Comparing Photometry to Homogenized Coadds]]
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[[des-sci-verification:SVA1_Gold_v10_SG_Validation|Applying new SG classifiers to the whole SVA1 region]].
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h2. Photometric Zeropoints
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Currently, "Bob Armstrong's SLR zeropoints":https://cdcvs.fnal.gov/redmine/projects/descalibration/wiki/Stellar_Locus_Regression have been tested and work reasonably well, but "finer scale SLR":https://cdcvs.fnal.gov/redmine/projects/descalibration/wiki/Stellar_Locus_Regression_for_SVA1_on_HEALPix_Grid is being worked on.
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h2. Survey Masks
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On this page, you can find the links to Mangle info.
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https://cdcvs.fnal.gov/redmine/projects/des-lss/wiki/SG1_infrastructure
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[[Improved Gold 1.0 Depth Maps]]
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[[Translating Mangle Masks Into Data Units]]
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[[Galaxy depth and completeness using Mangle Mask]]
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[[Sub-Pixelizing Mangle Masks]]
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[[Testing Correlation Functions with Pixelized Mangle Masks]]
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h2. SN Field Re-Coadds
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[[SVA1 SN Field Shallow Coadds]]
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h2. Cosmic ray rejection from catalogues
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I might be useful to have the peak intensity value at xpeak, ypeak [Richard McMahon]
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h2. Coadd catalogue objects provenance
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Coadd catalogue provenance link to input catalogue files. It would be useful to have the source id from
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the input catalog files
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e.g.
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DES0226-0416_r_cat.fits
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TTYPE1  = 'NUMBER  '           / Running object number
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This would allow joins between COADD_OBJECTS and OBJECTS_CURRENT and allow end-to-end checks.
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OBJECTS_CURRENT has columns called:
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OBJECT_ID,NUMBER,22,11,0,
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OBJECT_NUMBER,NUMBER,22,6,0,
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PARENTID,NUMBER,22,11,0,
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h2. Coadd catalogue objects deblending information
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It would be useful to know which objects are members of a blend so that one can
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determine the magnitude difference and pairwise separattions so that the effect of
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blending can be estimated. 
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h2. Other DESDM COADD catalogues oddities
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There are columns without the waveband identified 
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RA
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DEC
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Image shape parameters
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TTYPE8  = 'A_IMAGE '  
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TTYPE8  = 'B_IMAGE '
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THETA_IMAGE'
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but we have THETA_IMAGE_[GRIZY] but not A_IMAGE, B_IMAGE
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Ellipticity seem to be missing.
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Fluxes
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flux_psf values are in object catalogues but not in the coadd table
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h2. Other Pages
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[[Regions of Bad Photometry]]
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[[Bad Photometry Maps]]
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[[An Ugly Image]]
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[[On the Bias Jumps]]
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[[Some tests on depth with Mangle Mask]]
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[[Tile dependence of star-galaxy classification]]
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[[Tile dependence of PSF in the SN Field Coadds]]
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Column documentation at DESDM users group wiki page:
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https://cosmology.illinois.edu/confluence/display/DESDAF/Overview+of+data+columns+in+DESDB