Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.stsci.edu/instruments/observatory/cdbs/file_structure.html
Дата изменения: Wed Oct 8 17:13:05 1997 Дата индексирования: Sat Mar 1 22:04:55 2014 Кодировка: Поисковые слова: п п п п п п |
The new kid on the block!! FITS files, which both NICMOS and STIS use exclusively. FITS files have been around for a while in one form or another, but for data handled by CDBS, this is a new format. For more information on FITS files, check out FITS Support Office Home Page
When FITS files are processed in CDBS, they run through a verification process. For more information on this, look at fitsverify.
There are three kinds of reference files: reference images (FITS and GEIS), and tables. These are Sun format binary files that can only be read inside the iraf/stsdas environment. Although these are Sun format files, there are tools in STSDAS/IRAF to convert reference files from Sun to Vax format or to read STSDAS tables.
Files are stored in directories according to the instrument they are associated with and file type. The first letter of the directory name is the instrument code. The remainder of the name is either REF for reference images or TAB for tables. For example, HRS calibration images are stored in ZREF and HRS calibration tables are stored in ZTAB. The extension of the file name indicates the type of reference file. See below.
Reference images are stored as two files. The header is stored as a file with an extension ending in the letter h. The data is stored as a file with an extension ending with the letterd. Otherwise, the filenames of the two parts of a reference image are identical. Both files must be retrieved if you want to use a reference image. Reference files are given unique names based on their creation date.
A file name will be unique over the telescope's lifetime. The file name root has the format YMDHHMMSI where Y denotes the year (where 1981 = 1) M denotes the month of the year (where January = 1) D denotes the day HH denotes the hour (00-23) MM denotes the minutes S denotes seconds/2 I denotes the instrument ( where f=fgs, v=HSP, w=WFPC, x=FOC, y=FOS, z=HRS, m=multiple) The file name extension which is defined by file type is appended to the unique root.
(see below a list of different types)
An example would be FAR1106TU.R3H:
WFPC2 (last character in the rootname is U=>wfpc2), dark header file (R3H), named on October 27 1995 (FAR1106T).
Listed below is a table outlining directories all of the data types for each instrument, associated filename extensions, and database relation names.
WFPC2 Reference files =============== Directory UREF: =============== ASSOCIATED DATABASE ROOT EXTENSION FILE_TYPE QUALITY FILE RELATION -------------------------------------------------------------------------- ROOTNAME.R0H ROOTNAME.R0D STATIC MASK WFPC2 FILE and ROW ROOTNAME.R1H ROOTNAME.R1D AtoD CONVERSION ROOTNAME.R2H ROOTNAME.B2H ROOTNAME.R2D BIAS IMAGE + ROOTNAME.B2D ROOTNAME.R3H ROOTNAME.B3H ROOTNAME.R3D DARK + ROOTNAME.B3D ROOTNAME.R4H ROOTNAME.B4H ROOTNAME.R4D FLAT FIELD + ROOTNAME.B4D ROOTNAME.R5H ROOTNAME.R5D SHUTTER ------------------------------------------------------------------------- FOC reference files =============== Directory XREF: =============== DATABASE ROOT EXTENSION FILE_TYPE RELATION -------------------------------------------------------------------------- ROOTNAME.R0H ROOTNAME.R0D BAC (BACKGROUND) FOC FILE and ROW ROOTNAME.R1H ROOTNAME.R1D ITF (INTENSITY TRANSFER FUNCTION) ROOTNAME.R2H ROOTNAME.R2D UNI (UNIFORM DE) ROOTNAME.R3H ROOTNAME.R3D SDE (SPECTROGRAPHIC DE) ROOTNAME.R5H ROOTNAME.R5D GEO (GEOMETRIC) ROOTNAME.R7H ROOTNAME.R7D BLM (QUALITY) --------------------------------------------------------------------------- FOC sdas tables =============== Directory XTAB: =============== ROOTNAME.CXU FOC DQE TABLE (UNITAB) --------------------------------------------------------------------------- FOS reference files =============== Directory YREF: =============== DATABASE ROOT EXTENSION FILE_TYPE RELATION -------------------------------------------------------------------------- ROOTNAME.R0H FOS FILE and FOS ROW ROOTNAME.R0D BAC (BACKGROUND) ROOTNAME.R1H ROOTNAME.R1D FLT (FLAT FIELD) ROOTNAME.R2H ROOTNAME.R2D IVS (INVERSE SENSITIVITY) ROOTNAME.R3H ROOTNAME.R3D RET (WAVE RETARDATION) ROOTNAME.R4H ROOTNAME.R4D DDT (DISABLED DIODE) ROOTNAME.R5H ROOTNAME.R5D QIN (DQ INIT) ROOTNAME.R6H ROOTNAME.R6D POINT SPREAD FUNCTION ROOTNAME.R7H ROOTNAME.R7D LINE SPREAD FUNCTION ROOTNAME.R8H ROOTNAME.R8D AVERAGE INVERSE SENSITIVITY ---------------------------------------------------------------------------- FOS sdas Tables =============== Directory YTAB: =============== ROOTNAME.CY0 FOS APERTURE PARAMETERS ROOTNAME.CY1 FOS APERTURE POSITION PARAMETERS ROOTNAME.CY2 FOS EMISSION LINES ROOTNAME.CY3 FOS DETECTOR PARAMETERS ROOTNAME.CY4 FOS POLARIMETRY REDUCTION PARAMETERS ROOTNAME.CY5 FOS SKY SHIFT PARAMETERS ROOTNAME.CY6 FOS WAVELENGTH PARAMETERS ROOTNAME.CY7 FOS SCALE FACTORS FOR GIMP ROOTNAME.CY8 FOS PREDICTED MEAN BACKGROUND COUNT RATES AS A FUNCTION OF GEOMAGNETIC POSITION. ROOTNAME.CY9 FOS SCATTERED LIGHT CORRECTION PARAMETERS ROOTNAME.CYA OTA FOCUS HISTORY ROOTNAME.CYB APERTURE THROUGHPUT COEFFICIENTS AT NOMINAL FOCUS ROOTNAME.CYC APERTURE THROUGHPUT COEFFICIENTS VERSUS FOCUS ROOTNAME.CYD CORRECTION FACTORS FOR CHANGES IN DETECTOR SENSITIVITY ROOTNAME.CMG PAIRED PULSE PARAMETERS -------------------------------------------------------------------------- HRS reference files =============== Directory ZREF: =============== DATABASE ROOT EXTENSION FILE_TYPE RELATION -------------------------------------------------------------------------- ROOTNAME.R0H ROOTNAME.R0D DIO (DIODE RESPONSE) HRS FILE and HRS ROW ROOTNAME.R1H ROOTNAME.R1D PHC (CATHODE RESPONSE) ROOTNAME.R2H ROOTNAME.R2D VIG (VIGNETTING) ROOTNAME.R3H ROOTNAME.R3D ABS (ABSOLUTE FLUX) ROOTNAME.R4H ROOTNAME.R4D NET (WAVELENGTH NET) ROOTNAME.R5H ROOTNAME.R5D QIN ( DQ INIT) -------------------------------------------------------------------------- HRS sdas tables =============== Directory ZTAB: =============== ROOTNAME.CZ1 HRS LINE MAPPING PARAMETERS ROOTNAME.CZ2 HRS SAMPLE MAPPING PARAMETERS ROOTNAME.CZ3 HRS DETECTOR PARAMETERS ROOTNAME.CZ4 HRS WAVELENGTH RANGES ROOTNAME.CZ5 HRS SPECTRAL ORDER CONSTANTS ROOTNAME.CZ6 HRS DISPERSION CONSTANTS ROOTNAME.CZ7 HRS THERMAL CONSTANTS ROOTNAME.CZ8 HRS INCIDENCE ANGLE CONSTANTS ROOTNAME.CZ9 HRS ECHELLE RIPPLE INTERPOLATION CONSTAN ROOTNAME.CZA HRS ECHELLE RIPPLE NON-INTERPOLATION CON ROOTNAME.CZB HRS SCALE FACTORS FOR SCATTERED LIGHT SUBTRACTION ROOTNAME.CZC HRS GLOBAL WAVELENGTH COEFFICIENTS ROOTNAME.CZD HRS PHOTOCATHODE BLEMISH LOCATION TABLE ROOTNAME.CMG PAIRED PULSE PARAMETERS ROOTNAME.CZY PT-NE LAMP LINE LIST, CORRECTED TO VAC. WAVELENGTHS ROOTNAME.CZZ COEFFIENTS TO A FIT OF OFFSETS BETWEEN APERTURES (SSA) AND (SC1;SC2) ---------------------------------------------------------------------------- STIS reference files =============== Directory OREF: =============== DATABASE ROOT EXTENSION FILE_TYPE RELATION ------------------------------------------------------- ROOTNAME_BIA.FITS BIA STIS_FILE and STIS_ROW ROOTNAME_DRK.FITS DRK ROOTNAME_MOC.FITS MOC ROOTNAME_PFL.FITS PFL ROOTNAME_DFL.FITS DFL ROOTNAME_LFL.FITS LFL ROOTNAME_SSC.FITS SSC ------------------------------------------------------------------------------ STIS tables =============== Directory OTAB: =============== ROOTNAME_CCD.FITS CCD STIS_FILE and STIS_ROW ROOTNAME_A2D.FITS A2D ROOTNAME_CRR.FITS CRR ROOTNAME_BPX.FITS BPX ROOTNAME_LIN.FITS LIN ROOTNAME_PHT.FITS PHT ROOTNAME_APT.FITS APT ROOTNAME_APD.FITS APD ROOTNAME_LMP.FITS LMP ROOTNAME_IDC.FITS IDC ROOTNAME_SDC.FITS SDC ROOTNAME_IAC.FITS IAC ROOTNAME_1DT.FITS 1DT ROOTNAME_DSP.FITS DSP ROOTNAME_1DX.FITS 1DX ---------------------------------------------------------------------------- NICMOS reference files =============== Directory NREF: =============== DATABASE ROOT EXTENSION FILE_TYPE RELATION --------------------------------------------------------- ROOTNAME_DRK.FITS DARK NICMOS_FILE and NICMOS_ROW ROOTNAME_FLT.FITS FLAT ROOTNAME_ILM.FITS ILLUMINATION ROOTNAME_LIN.FITS LINEAR ROOTNAME_MSK.FITS MASK ROOTNAME_NOI.FITS NOISE -------------------------------------------------------------------------- NICMOS tables =============== Directory NTAB: =============== ROOTNAME_PHT.FITS NICMOS_FILE and NICMOS_ROW ----------------------------------------------------------------------------