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Gauging the Quality of the GSCII Database with QA: First Results

This project presents the first results of assessing the data quality of the GSCII database using QA procedures of different plate levels. The findings include comparisons of astrometry and photometry values for various plate pair classifications.

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Gauging the Quality of the GSCII Database with QA: First Results

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  1. GSCII Project Gauging the quality of the GSCII DB with QA_2plates: First results R. Pennons, R. Morbidelli, A Spagna, M. G.Lattanzi

  2. Diagram of QA_2plates procedures

  3. QA_2PlatesFirst level procedures (connection with CIQA)

  4. QA_2Plates: second level procedures

  5. QA_2Plates:Third level procedures

  6. Star counts

  7. Magnitude equation

  8. D(mag) vs mag

  9. Positional error as function of plate position

  10. Magnitude error as function of plate position

  11. The sample of processed plates • NUMBER OF SOURCE PLATES 067 • NUMBER OF PLATE PAIRS QAed 840 • PAIRS OF GSC I-II/GSCII PLTS WITH RELIABLE RESULTS 708335 • PAIRS OF GSC I-II /GSCII PLTS WITH SAME COL.DIFF.AREA 127059 • PAIRS OF GSC I-II /GSCII PLTS WITH SAME AREA DIFF.COL. 091064 • PAIRS OF GSC I-II /GSCII PLTS WITH DIFF.COL.- DIFF.AREA 479212 • PAIRS OF GSC I-II /GSCII WITH SAME COL. AND SAME AREA 011 000

  12. GALACTIC REPRESENTATION OF THE GSCII PLATES AT OATO Source (+) Overlap()

  13. Results from GSCII plate pairs STARS-STARS NON STARS - NON STARS D D D mag D D D mag MEAN VAL.GSCII ALL DATA +0.00 +0.55 -0.00 +0.49 +0.01 +0.47 +0.00 +0.72 -0.00 +0.69 +0.01 +0.59 GSCII ALL DATA +0.42 +0.20 +0.23 +0.17 +1.01 +0.20 +0.38 +0.18 +0.19 +0.17 +1.00 +0.23 MEAN VAL. GSCII SAME COL. +0.02 +0.50 -0.00 +0.44 +0.04 +0.27 +0.02 +0.67 -0.01 +0.61 +0.03 +0.32  OF GSCII SAME COL. +0.51 +0.18 +0.22 +0.15 +0.27 +0.08 +0.48 +0.20 +0.26 +0.17 +0.34 +0.12 MEAN VAL.GSCII SAME AREA +0.00 +0.38 +0.00 +0.36 +0.00 +0.54 +0.00 +0.64 +0.00 +0.63 -0.00 +0.61  OF GSCII SAME AREA +0.15 +0.16 +0.17 +0.15 +1.30 +0.20 +0.13 +0.20 +0.15 +0.20 +1.27 +0.18 MEAN VAL.GSCII DIFF.AREA - COL +0.00 +0.61 -0.00 +0.54 -0.00 +0.51 +0.00 +0.76 -0.00 +0.72 +0.00 +0.65  OF GSCII DIFF. AREA - COL. +0.44 +0.17 +0.24 +0.16 +1.04 +0.19 +0.39 +0.15 +0.19 +0.16 +1.03 +0.20

  14. Results of generic pair of plates

  15. Percentage of outliers

  16. Comparison GSCI + GSCII and GSCII plates ( sDx case ) stars – stars

  17. Comparison GSCI + GSCII and GSCII plates ( sDh case ) stars – stars

  18. Comparison GSCI + GSCII and GSCII plates ( sDx case ) nostars – nostars

  19. Comparison GSCII plates ( sDx case ) stars/stars and non stars/non stars

  20. Comparison GSCII ( sDx sDh )star-star case

  21. Comparison GSCII ( sDx sDh )non star-non star case

  22. Comparison GSCII ( sDx sDh )star-star case, same color

  23. Comparison GSCII ( sDx )star/star and non-star/non-star case same color

  24. Comparison GSCII ( sDx ) star/star case same area/diff. color and same color/diff. area

  25. Comparison GSCII ( sDx ) non-star/non-star case same area/diff. color and same color/diff. area

  26. Comparison GSCII ( sDx ) star/star and non-star/non-star same area/diff. color

  27. Comparison GSCI + GSCII and GSCII plates ( sD magnitude) star–star

  28. Comparison GSCI + GSCII and GSCII plates ( sD magnitude) non-star/non-star

  29. Comparison GSCII plates ( sD magnitude) star/star and non-star/non-star

  30. Comparison GSCII ( sD mag.) star/star case same color/diff. area and same area/diff. color

  31. Comparison GSCII ( sD mag.) non-stars/non-stars case same color/diff. area and same area/diff. color

  32. Comparison GSCII plates( sD mag ) star/star and non-star/non-star same color – diff. area

  33. Comparison GSCII plates( sD mag ) star/star and non-star/non-star diff. color – same area

  34. Comparison GSCII plates(Dx ) star/star and non-star/non-star

  35. Comparison GSCII plates (Dx and Dh ) star/star

  36. Comparison GSCII plates(Dx )star/star and non-star/non-star same color and different area

  37. Comparison GSCII plates(Dx )star/star and non-star/non-star different color and same area

  38. Comparison GSCII plates(Dx )star/star diff. color/same area and same color/diff. area

  39. Comparison GSCII plates(Dx )non-star/non-star diff. color/same area and same color/diff. area

  40. Comparison GSCII plates( D mag ) star/star and non-star/non-star

  41. Comparison GSCII plates( D mag ) star/star same color/diff. area – diff. Color/same area

  42. Comparison GSCII plates( D mag ) non-star/non-star same color/diff. area – diff. Color/same area

  43. Summary Notes • THIS IS A FIRST SYSTEMATIC ASSESSMENT OF GSCII DATA QUALITY BASED ON A LIMITED NUMBER OF PLATES. THESE ARE DISTRIBUTED AROUND THE GALACTIC PLANEANDTHE GALACTIC POLES. • AS EXPECTED, THE ASTROMETRY IN BOTH COORDINATES IS BETTER FOR THE STAR/STAR CASES THAN FOR THE NON-STAR/NON-STAR ONES • THE ()IS ON AVERAGE BETTER THAN () IRRESPECTIVE OF CLASSIFICATION • THE ASTROMETRY IS GENERALLY BETTER FOR PLATE PAIRS HAVING SAME AREA AND DIFFERENT COLOR IRRESPECTIVE OF OBJECT CLASSIFICATION • THE PHOTOMETRY APPEARS VERY CONSISTENT IRRESPECTIVE OF CLASSIFICATION. ON PAIRS OF EQUAL-BANDPASS PLATES THE AVERAGE ERROR (IN THE DIFFERENCE) IS ~0.3 MAG

  44. Summary Notes (continues) • AS EXPECTED, THE MEAN VALUES IN ,  AND (mag) ARE CENTERED AROUND THE NULL VALUE • MORE INTERESTING, THE DEVIATIONS OF ,  AND (mag) FROM THEIR MEAN VALUES SHOW THE EXPECTED BEHAVIORS FOR THE DIFFRENT CLASSES OF PLATE PAIRS (SAME AREA, DIFFERENT AREA, SAME BANDPASS, DIFF. BANDPASS, ETC.) • THIS GLOBAL QA DOES ALLOW THE DETECTION OF ANOMALOUS PLATES, AS IT WAS THE CASE FOR G039 (S020) • THIS TYPE OF ANALYSIS NEEDS TO BE RE-RUN ON A REPRESENTATIVE SET OF PLATES IN THE PRODUCTION DB AT ST ScI

  45. 2Mass – GSCII Export

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