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9/12/08Jon Thaler1 DocDB #1184: “Dark Energy Survey Data Management: Data Products” By Joe Mohr, et al. describes the metadata, including the FITS headers.

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Presentation on theme: "9/12/08Jon Thaler1 DocDB #1184: “Dark Energy Survey Data Management: Data Products” By Joe Mohr, et al. describes the metadata, including the FITS headers."— Presentation transcript:

1 9/12/08Jon Thaler1 DocDB #1184: “Dark Energy Survey Data Management: Data Products” By Joe Mohr, et al. describes the metadata, including the FITS headers. SISPI (the Image Builder) will fill the FITS headers according to this specification. Other metadata will be stored in the facility DB, which will be synchronized with the repository databases. NB: We have not yet figured out the logistics for acquiring all the information in a timely manner. FITS headers & other metadata

2 9/12/08Jon Thaler2 Table 2-3: DECam Exposure 0 Extension Header KeywordTypeExampleComment SIMPLELogicalTFile conforms to FITS standard BITPIXInteger8Number of bits per data pixel NAXISInteger0Number of data axes EXTENDLogicalTMay contain extensions NEXTENDInteger62Number of extensions FILENAMEStringdecam-2006-10-06-40141298.fits EXPNUMInteger452893DECam exposure number OBJECTStringDES0550-2116A Object name OBSTYPEStringobjectObservation type OBSERVERStringJohn PeoplesObserver Name PROPIDString2006B-0569Proposal ID DETECTORStringdecamDetector DETSIZEString[1:24576,1:28672]Detector size TELESCOPStringct4mTelescope Name OBSERVATStringCTIOObservatory Name LATITUDEString-30:09:54Observatory Latitude (deg) LONGITUDString70:49:00 WObservatory Longitude (deg) ALTITUDEFloat2215.0Observatory Altitude (m) TELRADECStringFK5Telescope coordinate system TELEQUINFloat2000.0Equinox of telescope coords TELRAString00:21:16.92Telescope RA (hr) TELDECString-48:39:43.6Telescope Dec (deg) KeywordTypeExampleComment HAString02:09:18.7Telescope hour angle (hr) ZDFloat30.7Telescope zenith distance (deg) AIRMASSFloat1.162Airmass FILTERStringg SDSS c6017Filter name TELFOCUSInteger16688Telescope focus TIMESYSStringUTC approximateTime system DATE-OBSString2006-09-05Date of observation start TIME-OBSString08:17:3.988Time of observation start MJD-OBSDouble53983.34519MJD of observation start EXPTIMEFloat354.43Exposure time (s) EXPREQFloat360.00Exposure time request (s) DARKTIMEFloat359.34Dark time (s) EPOCHFloat2007.054Epoch of observation WINDSPDFloat5.4Wind speed (mph) WINDDIRFloat24Wind direction (deg) AMBTEMPFloat11.9Ambient temperature (deg C) HUMIDITYFloat16Ambient relative humidity (%) PRESSUREFloat783Barometric pressure (mbar) SKYVARFloat2.54Sky variation from IR camera (%) FLUXVARFloat0.51Guide star flux variation (5) CHECKSUMString0WDA3T940TA90T99 Header Checksum CHECKVERStringcomplementChecksum software version IMAGEHWVStringSISPI hw 1.2.3.4 SISPI Hardware Version IMAGESWVStringSISPI sw 4.3.2.1 SISPI Software Version

3 9/12/08Jon Thaler3 Table 2-4: DECam Exposure Header for Image Extensions (1-62) KeywordTypeExampleComment XTENSIONStringIMAGEExtension type SIMPLELogicalTConforms to FITS standard BITPIXLong16Number of bits per data pixel BZEROLong32768Zero shift for unsigned short BSCALELong1Scale factor for unsigned short NAXISLong2Number of data axes NAXIS1Long2104Length of axis 1 NAXIS2Long4096Length of axis 2 EXTENDLogicalTMay contain extensions INHERITLogicalTInherits global header CCDNAMEStringFNAL #9817eFABR14-08 CCD Name CCDNUMLong1CCD Number DETSECString[1:2048,1:4096] Detector Section CCDSUMString1 1CCD pixel summing DATASECString[51:2098,1:4096] Data Section of CCD TRIMSECString[51:2098,1:4096] Trim Section of CCD AMPSECAString[1:1024,1:4096] Amp A Section BIASSECAString[1:50,1:4096] BIAS Section for Amp A GAINAFloat2.7Gain for Amp A RDNOISEAFloat7.8Read Noise for Amp A SATURATEAFloat40000.0Saturation for Amp A AMPSECBString[1025:2048,1:4096] Amp B Section BIASSECBString[2098:2148,1:4096] BIAS Section for Amp B GAINBFloat2.7Gain for Amp B RDNOISEBFloat7.8Read Noise for Amp B SATURATEBFloat40000.0Saturation for Amp B EQUINOXFloat2000.0Equinox of WCS WCSDIMLong2WCS Dimensionality CTYPE1StringRA---TANCoordinate Type CTYPE2StringDEC--TANCoordinate Type CRVAL1Double356.759700000Coordinate Reference Value CRVAL2Double-43.749901000Coordinate Reference Value CRPIX1Double13240.2333710Coordinate Reference Pixel CRPIX2Double6274.06658936Coordinate Reference Pixel KeywordTypeExampleComment CD1_2Float9.511111E-07 Coordinate Matrix CD2_1Float9.511111E-07 Coordinate Matrix CD2_2Float7.500000E-05 Coordinate Matrix PV1_0Float0.000000PV Distortion Coefficient PV1_1Float1.000000PV Distortion Coefficient PV1_2Float0.000000PV Distortion Coefficient PV1_3Float0.000000PV Distortion Coefficient PV1_4Float0.000000PV Distortion Coefficient PV1_5Float0.000000PV Distortion Coefficient PV1_6Float0.000000PV Distortion Coefficient PV1_7Float0.002000PV Distortion Coefficient PV1_8Float0.000000PV Distortion Coefficient PV1_9Float0.002000PV Distortion Coefficient PV1_10Float0.000000PV Distortion Coefficient PV2_0Float0.000000PV Distortion Coefficient PV2_1Float1.000000PV Distortion Coefficient PV2_2Float0.000000PV Distortion Coefficient PV2_3Float0.000000PV Distortion Coefficient PV2_4Float0.000000PV Distortion Coefficient PV2_5Float0.000000PV Distortion Coefficient PV2_6Float0.000000PV Distortion Coefficient PV2_7Float0.002000PV Distortion Coefficient PV2_8Float0.000000PV Distortion Coefficient PV2_9Float0.002000PV Distortion Coefficient PV2_10Float0.000000PV Distortion Coefficient CHECKSUMString0WDA3T940TA90T99Header checksum DATASUMString0WDA3T940TA90T99Data checksum CHECKVERStringcomplementChecksum version


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