WISE Software Interface Specification; fpg02; (WSDC D-I126) Written by F. Masci, version 1.0, 03/24/2009 Interface Name: Proposed FITS metadata for Atlas Image (Level-3) products: intensity, uncertainty, and depth-of-coverage co-adds. Read By: ARCHIVE TOOLS _________________________________ who? (Cognizant Scientist: Lin Yan) Written By: Final Product Generator (FPG) _________________ who? DESCRIPTION: Level-3 products correspond to Atlas Images or co-adds, created by combining multiple frame exposures within pre-defined footprints on the sky. These will be stored in the IRSA-WSDC Archive for distribution to the public. For details, see document WSDC D-D007. There are three associated Atlas Image products per band. These are as follows, with generic filenames as generated in WSDS processing: -w-int-3.fits - main intensity co-add -w-unc-3.fits - corresponding uncertainty co-add storing 1-sigma values for each pixel -w-cov-3.fits - corresponding effective depth-of-coverage for each pixel GENERIC FITS HEADER: Below is the proposed FITS metadata to write to each Atlas Image header. Keyword values are not realistic. The "int", "unc" and "cov" product types are distinguished by the FILETYPE keyword, e.g: int: FILETYPE = 'intensity image' unc: FILETYPE = '1-sigma uncertainty image' cov: FILETYPE = 'depth-of-coverage image' See below for further notes on specific keywords. SIMPLE = T / file does conform to FITS standard BITPIX = -32 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = 4095 / length of data axis 1 NAXIS2 = 4095 / length of data axis 2 FILETYPE= 'intensity image' / product description VERSION = X.X / processing version release TELESCOP= 'WISE' / telescope used to acquire data BAND = 1 / wavelength band ATLASID = 'xxxxxxxxx' / atlas-image identifier FCREATE = '2008-10-14T11:19:03' / WSDC file creation date DATEOBS1= '2009-12-10T16:18:03' / obs. date/time of earliest frame DATEOBS2= '2009-12-10T16:18:03' / obs. date/time of latest frame NUMFRMS = 763 / number of frames overlapping w/ footprint BUNIT = 'DN' / image pixel units MAGZP = 20.7712 / [mag] relative photometric zero point MAGZPUNC= 0.0213 / [mag] 1-sigma uncertainty in zero point EQUINOX = 2000.0 / [year] equinox of WCS EPOCH = 2010.1234567 / [year] obs epoch from median of inp DATEOBS ELON = 358.283464375023 / [deg] ecliptic longitude at image center ELAT = 27.861506700888 / [deg] ecliptic latitude at image center GLON = 94.5642062217685 / [deg] galactic longitude at image center GLAT = -32.3030368943585 / [deg] galactic latitude at image center SIZEX = 1.564444 / [deg] linear dimension along axis 1 SIZEY = 1.564444 / [deg] linear dimension along axis 2 CRVAL1 = 346.620274 / [deg] RA at CRPIX1,CRPIX2 for EQUINOX CRVAL2 = 24.723413 / [deg] Dec at CRPIX1,CRPIX2 for EQUINOX CROTA2 = 0.000000 / [deg] image twist: +axis2 W of N for EQNOX PA = 0.000000 / [deg] pos.angle of +axis2 E of N for EQNOX CDELT1 = -0.0003819444391411 / [deg/pix] scale at CRPIX1,CRPIX2 for axis 1 CDELT2 = 0.0003819444391411 / [deg/pix] scale at CRPIX1,CRPIX2 for axis 2 PXSCAL1 = 1.375000 / [asec/pix] scale at CRPIX1,CRPIX2 for axis1 PXSCAL2 = 1.375000 / [asec/pix] scale at CRPIX1,CRPIX2 for axis2 CRPIX1 = 2048.0 / ref. pixel at CRVAL1,CRVAL2 along axis 1 CRPIX2 = 2048.0 / ref. pixel at CRVAL1,CRVAL2 along axis 2 CTYPE1 = 'RA---SIN' / projection type for axis 1 CTYPE2 = 'DEC--SIN' / projection type for axis 2 BITMASK = 134217732 / fatal bitstring pixel masking template QASTATUS= 10 / Quality Assurance rating?? ??specific co-add QA metrics?? HISTORY created by AWAIC: A WISE Astronomical Image Coadder; Vsn 4.1 END NOTES: * The BUNIT keyword for the "int" and "unc" images is always DN, and corresponds to a quantity proportional to the average of the input instrumentally calibrated slopes over frames. For "cov" images, BUNIT should be set to 'dimensionless'.