Difference between revisions of "Single detector maps"
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== Introduction == | == Introduction == | ||
− | + | <center> | |
+ | {| border="1" cellspacing="10" cellpadding="8" align="center" style="background:yellow; color:maroon; font-size:150%" width="600px" | ||
+ | ! There are no single detector maps in the first release. | ||
+ | |||
+ | This section will serve for later releases. | ||
+ | |} | ||
+ | </center> | ||
+ | |||
+ | |||
+ | |||
+ | Maps for single detectors are built for full or part of the mission and are used primarily for characterization purposes: while the ones built with an unpolarized detector have a scientific value, the ones built using a polarization sensitive one have little, since, among other things, the polarization angle varies around the sky. Each signal map will be accompanied by a hit map and a variance map. All maps are in Healpix format, with Nside of 2048 for HFI and of 1024 for LFI, in Galactic coordinates, and Nested ordering. The three maps will be packaged into a FITS files with a single ''BINTABLE'' extension containing a table of three columns; the structure of the FITS file is given in the [[#FITS file structure | FITS file structure]] section below. | ||
+ | |||
+ | The FITS filenames are of the form ''{H|L}FI_{detname}_nnnn_yyyymmdd_{type}_{mission}.fits'', where ''detname'' is a detector identifier, and ''nnnn'' is the Healpix Nside of the map, the optional ''type'' indicates the subset of input data used, and ''mission'' indicates the coverage period, i.e., ''full'', ''nominal'', or ''survey_n'' (TBC; an alternative of the type ''{H|L}FI_detname_{type}_{mission}_Rn.mm.fits'' is being considered, where Rn.mm is the release number). A full list of products, by their names, is given in the [[#List of products | List of products]] below. | ||
+ | These | ||
− | |||
=== HFI Processing === | === HFI Processing === | ||
− | + | See [[Frequency Maps#Introduction|Frequency Maps]] section | |
=== LFI PRocessing === | === LFI PRocessing === | ||
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=== First release === | === First release === | ||
− | + | None | |
=== Second Release === | === Second Release === |
Latest revision as of 10:47, 18 October 2012
Contents
Introduction[edit]
There are no single detector maps in the first release.
This section will serve for later releases. |
---|
Maps for single detectors are built for full or part of the mission and are used primarily for characterization purposes: while the ones built with an unpolarized detector have a scientific value, the ones built using a polarization sensitive one have little, since, among other things, the polarization angle varies around the sky. Each signal map will be accompanied by a hit map and a variance map. All maps are in Healpix format, with Nside of 2048 for HFI and of 1024 for LFI, in Galactic coordinates, and Nested ordering. The three maps will be packaged into a FITS files with a single BINTABLE extension containing a table of three columns; the structure of the FITS file is given in the FITS file structure section below.
The FITS filenames are of the form {H|L}FI_{detname}_nnnn_yyyymmdd_{type}_{mission}.fits, where detname is a detector identifier, and nnnn is the Healpix Nside of the map, the optional type indicates the subset of input data used, and mission indicates the coverage period, i.e., full, nominal, or survey_n (TBC; an alternative of the type {H|L}FI_detname_{type}_{mission}_Rn.mm.fits is being considered, where Rn.mm is the release number). A full list of products, by their names, is given in the List of products below. These
HFI Processing[edit]
See Frequency Maps section
LFI PRocessing[edit]
TBW
List of products[edit]
First release[edit]
None
Second Release[edit]
TBW
FITS file structure[edit]
The FITS file structure is like that of Intensity-only frequency maps as described in the next section
Header keywords[edit]
A typical header for the extension is
XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 12 / width of table in bytes NAXIS2 = 50331648 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 3 / number of fields in each row TTYPE1 = 'I_Stokes' / label for field 1 TFORM1 = '1E8 ' / data format of field: 4-byte REAL TUNIT1 = 'K_CMB ' / physical unit of field TTYPE2 = 'Hits ' / label for field 2 TFORM2 = '1J ' / data format of field: 4-byte INTEGER TUNIT2 = 'none ' / physical unit of field TTYPE3 = 'II_cov ' / label for field 3 TFORM3 = '1E8 ' / data format of field: 4-byte REAL TUNIT3 = '(K_CMB)^2' / physical unit of field EXTNAME = 'CH-MAP ' / name of this binary table extension FREQ = '857 ' PIXTYPE = 'HEALPIX ' COORDSYS= 'GALACTIC' ORDERING= 'NESTED ' FILENAME= 'HFI_857-2_2048_20120210_nominal.fits' NSIDE = 2048 CHANNEL = '857-2 ' FIRSTPIX= 0 LASTPIX = 50331647 EXTVER = '1 ' PROCVER = 'v50 ' BAD_DATA= '-1.63750E+30' COMMENT = 'Rel DR4 ' END
(Planck) High Frequency Instrument
(Planck) Low Frequency Instrument
Flexible Image Transfer Specification
To be confirmed
Cosmic Microwave background