ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

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262 CHAPTER 20. ADVANCED DATA CALIBRATION • Project the images contained in the FITS files and place the results in the file result.fits: CIA> spawn, !cia_exec+’/projection -i2,input -o result.fits’ • Take a look at the result: CIA> result = readfits(’result.fits’, hdr) CIA> tviso, result[*, *, 0] 20.15.4 Back projection The projection routines also allow the possibility to back project a raster MOSAIC to a set of EXPOSUREs. A real source will, due to the many effects present in the <strong><strong>ISO</strong>CAM</strong> data, have a somewhat different signal in each EXPOSURE. The purpose of the data calibration is to minimize or eliminate this difference. Knowledge of how the signal varies from EXPOSURE to EXPOSURE is not contained in the raster MOSAIC, so the back-projected EXPOSUREs will each contain an averaged source signal. Figures 20.7 and 20.8 illustrate this point. Note that this averaged source signal is really an idealized signal, i.e. it assumes that the same source has the same signal in each EXPOSURE. This assumption can be useful for testing the quality of the data analysis. The less the signal in the original EXPOSUREs deviates from the idealized signal in the back-projected EXPOSUREs the better the quality of the data calibration. The back projection is performed with the routine back project. You should of course only perform back projection on a fully calibrated PDS after creation of the raster MOSAIC: CIA> raster_scan, raster_pds CIA> help, raster_pds.image FLOAT = Array[32, 32, 8] CIA> back_project, raster_pds, images CIA> help, images IMAGES FLOAT = Array[32, 32, 8] You can use stat to check the quality of your calibration. The lower the RMS the less the averaged or idealized signal deviates from the real calibrated and corrected signal: CIA> stat, images - raster_pds.image ------------------------------------------- Image dimensions: 32 32 Number of frames: 8 Total number of pixels: 8192 ------------------------------------------- Minimum Maximum Mean Median RMS -10.7506 14.4660 0.144570 0.00626230 0.902133
20.15. ADVANCED PROJECTION 263 Figure 20.7: Original pixel histories of the same source. Note the source has different signal levels in different SCDs. After reduction, this will propagate into different signal levels in the corresponding EXPOSUREs.
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ISOCAM Interactive Analysis User’
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Michael Rupen (NRAO) Jaqui Sam Lone
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vi CONTENTS 8 Polarization observat
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viii CONTENTS 14.4.6 x3d as a calib
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x CONTENTS 19.3 A beam-switch obser
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xii CONTENTS B CIA command short-li
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xiv CONTENTS
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xvi LIST OF FIGURES 14.13The raster
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xviii LIST OF FIGURES
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xx LIST OF TABLES
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2 CHAPTER 1. ABOUT THE CIA USER’S
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4 CHAPTER 2. ABOUT CIA 2.2 System r
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6 CHAPTER 2. ABOUT CIA Figure 2.2:
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8 CHAPTER 2. ABOUT CIA In addition,
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10 CHAPTER 2. ABOUT CIA 2.3.4 Custo
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12 CHAPTER 2. ABOUT CIA LOG Log fil
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14 CHAPTER 2. ABOUT CIA This will p
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16 CHAPTER 2. ABOUT CIA % device, p
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18 CHAPTER 2. ABOUT CIA
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Introduction The Quick Start Guide
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24 CHAPTER 3. RASTER OBSERVATION (C
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32 CHAPTER 4. STARING OBSERVATION (
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34 CHAPTER 4. STARING OBSERVATION (
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36 CHAPTER 5. SOLAR SYSTEM OBJECT O
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42 CHAPTER 6. BEAM-SWITCH OBSERVATI
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48 CHAPTER 7. CVF OBSERVATION (CAM0
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50 CHAPTER 7. CVF OBSERVATION (CAM0
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52 CHAPTER 8. POLARIZATION OBSERVAT
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Introduction The purpose of Part II
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62 CHAPTER 9. THE DATA PRODUCTS AND
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68 CHAPTER 10. FIRST LOOK AT THE DA
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74 CHAPTER 11. INTRODUCTION TO CIA
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76 CHAPTER 11. INTRODUCTION TO CIA
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78 CHAPTER 12. DATA SLICING 3. At t
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80 CHAPTER 12. DATA SLICING CIA> ns
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82 CHAPTER 12. DATA SLICING equal t
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84 CHAPTER 12. DATA SLICING OR CIA>
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86 CHAPTER 12. DATA SLICING 70 16.0
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88 CHAPTER 12. DATA SLICING • Sel
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90 CHAPTER 12. DATA SLICING We sugg
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92 CHAPTER 12. DATA SLICING title d
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94 CHAPTER 12. DATA SLICING • Sel
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96 CHAPTER 13. DATA CALIBRATION 13.
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98 CHAPTER 13. DATA CALIBRATION •
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100 CHAPTER 13. DATA CALIBRATION 13
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104 CHAPTER 13. DATA CALIBRATION Fi
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106 CHAPTER 13. DATA CALIBRATION au
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108 CHAPTER 13. DATA CALIBRATION 2.
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114 CHAPTER 14. IMAGE ANALYSIS AND
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Introduction The purpose of this pa
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Chapter 15 CIA data structure high-
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15.2. OBSERVATION DATA STRUCTURES 1
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15.3. CALIBRATION DATA STRUCTURE (C
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15.4. AUXILIARY CALIBRATION DATA 17
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15.4. AUXILIARY CALIBRATION DATA 17
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15.5. PREPARED DATA STRUCTURE (PDS)
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Chapter 16 Data structure manipulat
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16.1. CIA DATA STRUCTURE INTERFACE
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16.1. CIA DATA STRUCTURE INTERFACE
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16.2. AN EXAMPLE OF SAD MANIPULATIO
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16.4. MANIPULATING THE MASK 195 and
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16.5. CDS DATA EXTRACTION 197 16.5
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16.6. MANIPULATING CIA DATA STRUCTU
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Chapter 17 Importing ISO data produ
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17.2. IMPORTING FITS TO REGULAR IDL
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Chapter 18 Export of CIA data struc
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18.3. EXPORT FOR ARCHIVING 207 CIA>
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Part IV Advanced Use of CIA 209
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Page 318 and 319: 298 CHAPTER 23. X CIA REFERENCE GUI
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312 APPENDIX A. GLOSSARY
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314 APPENDIX B. CIA COMMAND SHORT-L
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320 APPENDIX C. THE ISO CD-ROM C.2.
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322 APPENDIX C. THE ISO CD-ROM Vari
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324 APPENDIX D. GUIDELINES FOR WRIT
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326 APPENDIX D. GUIDELINES FOR WRIT
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328 APPENDIX E. ISOCAM ASTROMETRY:
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338 APPENDIX F. WHAT IS NEW IN CIA
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344 APPENDIX G. WARNING MESSAGES IN
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346 APPENDIX H. PATCHED ASTROLIB AN
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348 APPENDIX I. UPGRADING OLD CIA S
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350 APPENDIX I. UPGRADING OLD CIA S
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352 APPENDIX J. REPORTING PROBLEMS
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354 APPENDIX K. TECHNICAL REPORTS S
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356 BIBLIOGRAPHY Okumura K., 1998,
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