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

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334 APPENDIX E. ISOCAM ASTROMETRY: ANGLES AND COORDINATES Axis 2 North θ Axis 1 East Figure E.5: Conventions for the standard astrometric keywords in a FITS header. Axis1 is the horizontal rightward axis, Axis2 is the vertical upward axis. CROTA2, θ, the rotation angle described in the header, has a definition which is different from that of α or β. Itistheposition angle of the North axis counted positively eastward from Axis2.
E.3. USING FITS IN CIA – NEW PROBLEMS 335 my header = fits header ( Nx, NAXIS1 Ny, NAXIS2 RefX, CRPIX1 RefY, CRPIX2 RA, CRVAL1 Dec, CRVAL2 Angle, CROTA2 ResolX, CDELT1 ResolY, CDELT2 equinox = my equinox cd = cd) Some explanations are required for those unfamiliar with FITS. To fully grasp them, please consult also Figure E.5). NAXISn are the number of pixels on the 2 axes. Axis1 is the horizontal rightward axis, and Axis2 is the vertical upward axis. In order to perform some astrometry, one need to know the coordinates (α, δ) of a reference pixel in the image, the plate scale and an orientation angle. CRPIXn are the pixel coordinates of that reference pixel (usually the central one), while CRVALn are its (α, δ) coordinates in degrees. CROTA2 it the position angle of the celestial North axis with respect to the Axis 2 counted positively eastward, i.e. it is different from the definitions of angles used in CIA where the North axis was the reference. Figure E.5 clearly shows that difference (it is the angle called θ). An incorrect value in CROTA2 is the first error possibility when you find that fits header ‘does not work’. CDELTn are the plate scales on both axes. In the FITS header they will appear in degrees per pixel which are the units you must give to fits header. Getting the units wrong is a second source of error when the routine ‘does not work’. The CDELT parameters must be given with the correct signs. These are: LW SW CDELT1 > 0 CDELT1 < 0 CDELT2 < 0 CDELT2 < 0 The reason that CDELT2 is negative is that pixel (0, 0) is defined to be at the top of an ISOCAM image. This is of course an arbitrary decision but to reverse it all the signs must be changed. Do not forget to specify the equinox keyword. IDL works by default in B1950.0 while ISO only uses J2000.0. . . Optionally you can pass in the CD matrix if you already know it. It is defined as: cos(crota2) sin(crota2) −sin(crota2) cos(crota2) The easiest way to get the CROTA2/CDELT/CD parameters is to ask the roll to crota2 routine to give you them. Its calling sequence is: crota2 = roll_to_crota2(roll [,channel, pfov, cdelt, cd]) pfov is the pixel-field-of-view. For example, CIA> crota2 = roll_to_crota2 (scd_get(’roll’,scd), ’lw’, [3,3], cdelt, cd])
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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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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
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Page 358 and 359: 338 APPENDIX F. WHAT IS NEW IN CIA
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Page 368 and 369: 348 APPENDIX I. UPGRADING OLD CIA S
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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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