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

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38 CHAPTER 5. SOLAR SYSTEM OBJECT OBSERVATION (CAM01) 7. The final step in the data reduction is to create the MOSAIC image. This is really just the average of all the IMAGEs in sso pds.cube and we can easily derive it with CIA’s reduce cube. Before doing so we must do a ‘fake’ reduce as we normally do when reducing a raster PDS, BS PDS or CVF PDS. This is really just to keep the PDS consistent with the data reduction step by making sure important fields, such as sso pds.image unit, are updated. CIA> reduce, sso_pds Now you can take a look at the EXPOSURE obtained for each SCD or pointing of the spacecraft. These images should look very much alike – all will be slightly smeared. This smearing is due to steps ISO makes as it re-points, i.e. the tracking is of course not smooth. You will also notice that the position of the object may be slightly different from EXPOSURE to EXPOSURE. This second effect is due to the inaccuracies of ISO’s pointing. CIA> x3d, sso_pds Now we will do the ‘real’ reduce manually. The MOSAIC image is stored in the first frame of sso pds.image: CIA> sso_pds.image[*,*,0] = reduce_cube(sso_pds.cube, mask=sso_pds.mask) Flat correction finishes off this reduction step: CIA> corr_flat, sso_pds 8. So to view the results of your calibration use xdisp or tviso, specifying the first frame of sso pds.image as input: CIA> tviso, sso_pds.image[*,*,0] You should see the same image as in Figure 5.1. The effects that we saw earlier in Step 7withx3d (smearing and pointing inaccuracies) will have combined to make the comet look somewhat blurred in this final MOSAIC image. 9. Now we can convert the MOSAIC image from ISOCAM units into milli-janskys (mJy): CIA> conv_flux, sso_pds 10. As in the end of Section 3.2 you can save the data using IDL’s SAVE: CIA> save, file=’sso_pds.xdr’, sso_pds Export to FITS may be performed with CIA’s imagette2fits. This routine will place the data in the field sso pds.image, and hence the MOSAIC image, into the primary array of the FITS file: CIA> imagette2fits, sso_pds, name="tempel-tuttle.fits", rank=0 We use the keyword rank to specify the MOSAIC image, i.e. the first frame of sso pds.image. This image is written to the file tempel-tuttle1.fits. An improved method to analyse solar-system observations can be found in section 20.7
5.2. DATA ANALYSIS 39 Figure 5.1: tviso display of the MOSAIC image from a solar system object observation.
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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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Page 16 and 17: xvi LIST OF FIGURES 14.13The raster
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Page 20 and 21: xx LIST OF TABLES
Page 22 and 23: 2 CHAPTER 1. ABOUT THE CIA USER’S
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Page 28 and 29: 8 CHAPTER 2. ABOUT CIA In addition,
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Page 41: Introduction The Quick Start Guide
Page 44 and 45: 24 CHAPTER 3. RASTER OBSERVATION (C
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Page 79: Introduction The purpose of Part II
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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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212
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214 CHAPTER 19. ADVANCED SLICING 19
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216 CHAPTER 19. ADVANCED SLICING Fi
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226 CHAPTER 19. ADVANCED SLICING va
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230 CHAPTER 19. ADVANCED SLICING
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232 CHAPTER 20. ADVANCED DATA CALIB
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274 CHAPTER 21. USING SLICE WITHIN
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294 CHAPTER 22. SECOND ORDER CORREC
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296 CHAPTER 22. SECOND ORDER CORREC
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298 CHAPTER 23. X CIA REFERENCE GUI
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306 APPENDIX A. GLOSSARY beam-switc
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308 APPENDIX A. GLOSSARY FITS (data
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310 APPENDIX A. GLOSSARY raster dat
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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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