||
3.3 EXAMINING THE HEADERS
There was discussion earlier concerning the use of generic image taskswith the NOAO Mosaic data. The tasks IMHEADER and HSELECT fall intothis category. The two important points to keep in mind are that youmust specify either an extension name or the extension position andthat the headers of an extension are the combination of the global
header and the extension headers.
Often one does not need to list all the headers for all the extensions.The image title and many keywords of interest are common to all theextensions. Thus one of the following commands will be sufficient toget header information about an exposure or set of exposures: ms> imhead obj*[1] l- # Title listing ms> imhead obj123[1] l+ | page # Paged long listing ms> hselect obj*[1] $I,filter,exptime,obstime yes If you need to list header information from all the extensions then youneed to take the additional step of creating an @file or using MSCCMD.
For example to get the default read noise and gain values for each CCD:
ms> imextensions obj123 > list123
ms> hselect @list123 $I,rdnoise,gain yes
or
ms> msccmd "hselect $input $I,rdnoise,gain yes" input=obj123
The CCDLIST task in the MSCRED package is specialized for the mosaicdata. It provides a compact description of the name, title, pixeltype, filter, amplifier, and processing flags. The "extname" parametermay be used to select a particular extension, a set of extensions, orall extensions. Because all extensions should generally be at the samestate of reduction it may be desirable to list only the first extension. Like most of the CCD reduction tasks you can also selectonly a certain type of exposure for listing. Examples of the two modes
are:
# Summary for all exposures ms> ccdlist *.fits extname=im1 # Summary for all object exposures ms> ccdlist *.fits extname=im1 ccdtype=object # List of all extensions. ms> ccdlist obj123 extname=""
进入IRAF后到数据目录下提取fits头文件的关键字
ecl>hselect *.fits $I, key1,key2,key3 yes > 存储为文件名
我的实例
从光谱fits里面提取所用的信息,存为对应的日期(5022)
ecl> hselect spec-56780-KP185111N464417V01_sp*.fits $I,PLANID,OBJNAME,RA,DEC,MAGTYPE,MAG1,MAG2,MAG3,MAG4,MAG5,MAG6,MAG7,SN_R yes > 5022
ecl> hselect spec-56096-kepler08B56096_2_sp*.fits $I,PLANID,RA,DEC,OBJTYPE,OBJSOURC,T_INFO,T_FROM,FIBERTYP,VERSPIPE,CLASS,SUBCLASS,MAGTYPE,MAG1,MAG2,MAG3,MAG4,MAG5,MAG6,MAG7,SN_R yes >1405
^_^_____________________________________
更多详情请ecl> help hselect
http://iraf.net/irafdocs/mscguide.php
2014-12-17于BNU
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