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

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330 APPENDIX E. <strong><strong>ISO</strong>CAM</strong> ASTROMETRY: ANGLES AND COORDINATES By construction, The M+ axis is identical to the Y+ axis while the N+ axis is in opposition to the Z+ axis. • α is the roll of the camera, as in Figure E.1. In the raster PDS α is found in the fields .ANGLE RASTER and .INFO.ROLL. In the the SCD and SSCD, it is simply the field .ROLL. • β is the so-called SSCD and raster PDS field .RASTER ROTATION. It is the position angle of the M+ axis of the raster, i.e. the angle between the celestial North and the M+ axis, counted positively eastward. In a Y-axis raster, RASTER ROTATION cannot be specified by the observer at the PGA level, and a very simple relation links it with the roll angle: β = α +90 ◦ or RASTER ROTATION = ROLL + 90 ◦ These rasters can be reconstructed quite straightforwardly as the camera’s axes are parallel to the raster axes. E.1.3 Rasters referenced to the celestial North axis These rasters are called in short ‘North axis’ rasters. An example of such a raster is shown in Figure E.3. These rasters can generate quite some confusion. First, to program them, the observer had to specify the raster’s position angle, but could only supply one comprised between 0 ◦ and 180 ◦ (in PGA this parameter was called orientation angle). Therefore there is a 180 ◦ uncertainty between programing and reality (see Section E.2 to remove that uncertainty). In this section we are only concerned with ‘reality’, what has actually been performed. Second, before reconstructing the raster, images have to be rotated by a certain angle. This angle is not written in the data but has to be derived from the two others that we know already, α and β. Figure E.3 show these angles, their definition follows: • α is the roll angle of the mosaic, also called ANGLE RASTER in CIA structures. • β is the true RASTER ROTATION comprised between 0 ◦ and 360 ◦ . • γ is the angle between the M+ and Y+ axis, measured in the direct trigonometrical sense from the M+ axis to the Y+ axis. Note that in that case, α and β cannot be deduced from one another. Given that the rasters are reconstructed with the M+ axis as horizontal axis and the N+ axis as the vertical axis, prior to project an individual position in that image, the data have to be rotated by γ. Looking at Figure E.3, one has: γ = α − β +90 ◦ or γ = ROLL - RASTER ROTATION + 90 ◦
E.1. DEFINITIONS 331 North M+ β Start East North End Z+ α β N+ γ Y+ Figure E.3: Schematic of a M=4, N=3 raster oriented with reference to the North axis. Crosses,×, mark successive positions of the raster. Here the raster position angle given in PGA was approximately 65 ◦ (see text). Note however that the actual RASTER ROTATION is in fact ∼ 245 ◦ , as the location of start and end points shows. The camera, its 24 th column and pixel (0,0) are once again displayed for clarity purposes. Angles α, β, andγ are explained in the text.
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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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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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228 CHAPTER 19. ADVANCED SLICING Fo
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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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Page 318 and 319: 298 CHAPTER 23. X CIA REFERENCE GUI
Page 326 and 327: 306 APPENDIX A. GLOSSARY beam-switc
Page 328 and 329: 308 APPENDIX A. GLOSSARY FITS (data
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Page 332 and 333: 312 APPENDIX A. GLOSSARY
Page 334 and 335: 314 APPENDIX B. CIA COMMAND SHORT-L
Page 340 and 341: 320 APPENDIX C. THE ISO CD-ROM C.2.
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Page 344 and 345: 324 APPENDIX D. GUIDELINES FOR WRIT
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Page 348 and 349: 328 APPENDIX E. ISOCAM ASTROMETRY:
Page 358 and 359: 338 APPENDIX F. WHAT IS NEW IN CIA
Page 364 and 365: 344 APPENDIX G. WARNING MESSAGES IN
Page 366 and 367: 346 APPENDIX H. PATCHED ASTROLIB AN
Page 368 and 369: 348 APPENDIX I. UPGRADING OLD CIA S
Page 370 and 371: 350 APPENDIX I. UPGRADING OLD CIA S
Page 372 and 373: 352 APPENDIX J. REPORTING PROBLEMS
Page 374 and 375: 354 APPENDIX K. TECHNICAL REPORTS S
Page 376 and 377: 356 BIBLIOGRAPHY Okumura K., 1998,
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