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

170 CHAPTER 15. CIA DATA STRUCTURE HIGH-LEVEL ARCHITECTURE
subfield description of contents type
DATA.TUNIT pixel unit of intensity string
DATA.RA RA (J2000) of CRPIX1 double
DATA.DEC DEC (J2000) of CRPIX2 double
DATA.ROLL roll of the DATA double
DATA.CRPIX1 reference pixel float
DATA.CRPIX2 reference pixel float
DATA.DATA actual image data float IDL array
DATA.RMS IMAGE error on image float IDL array
DATA.WEIGHT IMAGE exposure time (secs) per pixel integer IDL array
DATA.MASK as for SCD (Section 15.2.2) byte IDL array
The subfields RA, DEC, ROLL, CRPIX1 and CRPIX2 contain parameters that follow
the FITS convention. RA, DEC and ROLL are in decimal degrees. CRPIX1 and CRPIX2
are the x and y coordinates of the reference pixel respectively, and refer to the centre of
the reference pixel e.g. for reference pixel (16, 16), CRPIX1=16.5 and CRPIX2=16.5.
2. N RASTER: As for SCD (see Section 15.2.2).
3. M RASTER: As for SCD (see Section 15.2.2).
4. ASNUMBER: As for SCD (see Section 15.2.2).
5. CAL: As for SCD (see Section 15.2.2).
15.2.5 Set of SADs (SSAD)
The SSAD is a catalogue of a set of SADs, either origin SADs or future SADs. The SSAD has
the same relationship to SADs that SSCDs have with SCDs. It also has similar structure to the
SSCD. In addition to the standard fields of Section 15.2.1 it has the following fields:
1. NSAD: The number of of SADs belonging to this SSAD. Type: integer.
2. ORIGIN: If a future SSAD, returns the name of the origin SSAD which catalogues the
origin SADs. Type: string.
3. FUTURE: If an origin SSAD, returns the name of the future SSAD which catalogues the
future SADs. Type: string.
4. RASTER COLUMNS: As for SSCD.
5. RASTER LINES: As for SSCD.
6. RASTER ORIENTATION: As for SSCD.
7. RASTER ROTATION: As for SSCD.
8. RA: RA(J2000) of the centre of the final MOSAIC that is constructed from the EXPO-
SUREs in the SAD. Type: double. Unit: decimal degrees.
9. DEC: DEC(J2000) of the centre of the final MOSAIC that is constructed from the EX-
POSUREs in the SAD. Type: double. Unit: decimal degrees.
10. ROLL: As for SCD (see Section 15.2.2).