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

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288 CHAPTER 21. USING SLICE WITHIN CIA from the readouts in bins 1 and 2; if more than two thirds of the readouts fall in bin 2 and 3 (rather normal distribution, around the mean level), the sky value is taken from the readouts in bins 2 and 3. If none of these combinations represents more than two thirds of the readouts, the sky value is taken from the readouts in bins 2 and 3 as well. 7. As what we have now is a map of residuals, we add the smoothed map that had been subtracted to create them and this is the new sky map. From this description I hope it is rather clear that the parameters to the methods will be those related to the ghost filtering, the smoothing window for the map and the threshold for the bad pixels detection. Here they are, listed in more details. • size filter This is the size of the smoothing window applied to the sky map, both to determine location of ghosts and to identify bad pixels. Although it is in principle equivalent to the keyword in the DivSky flat-field method, if the map contains undefined values (and it generally does), it is already smoothed twice with windows of 5 and 7 pixels, further smoothing is thus not required and at least small windows should be used. • bad pix thresh This is the number of σ above and below 0 that we use as a threshold in the examination of the residual maps. The range of acceptable values depend quite strongly on the noise used, either global or local (see below). • /local If set, the current error map will be used to examine the residual maps instead of a median noise level. In principle this option should be used, although the bad pix thresh should then be higher than in the median noise option. • ghost thresh As the name implies, used to flag ghosts. • peak thresh Also related to ghosts 21.7 Frequently Asked Questions and Problems In this section, I list the questions that can arise from a use of SLICE and whose answer did not really fit in the flow of this introduction (or are worth restating). Q: I have applied the ltt action and subtracted the correction derived by SLICE, yet after flat-field correction with DivSky, the long-term transient is apparently still there, what is happening? A: This is typically a property of DivSky which uses the previously existing map (which in general was made prior to the long-term transient correction and therefore still shows it) to estimate the true sky. If the long term transient is strong enough then it can be detected by SLICE as a flat-field defect (it is in the image but not in the cube itself because it has been removed) and it will create a new image still affected by what seems to be a long-term transient, although now it is in the flat-field and not in the cube. The solution is to apply another flat-field method right after the long-term transient correction to create an estimate of the sky free of the long-term transient component, and then use DivSky. Q: I’m trying to run the ltt action on my raster and I encounter an IDL crash in the routine correct ltt. Apparently it is trying to access a non-existing element of table si raster. Why is that?
21.7. FREQUENTLY ASKED QUESTIONS AND PROBLEMS 289 A: Since April 2000 approximately, the correct ltt function uses the raster variable to find and mask ghosts before it evaluates the long-term transient component. Obviously this requires that the variable exists (si raster is a variable that holds its dimensions). correct ltt does not create it, only make map does. Make sure it has run before the ltt action (see also sec. 21.5.3).
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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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214 CHAPTER 19. ADVANCED SLICING 19
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230 CHAPTER 19. ADVANCED SLICING
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232 CHAPTER 20. ADVANCED DATA CALIB
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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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