Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/7.1.0/doc/merge/node8.html
Дата изменения: Mon Jul 9 02:02:30 2007
Дата индексирования: Sat Dec 22 07:29:02 2007
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XMM-Newton Science Analysis System


merge (merge-0.13) [xmmsas_20070708_1801-7.1.0]

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Algorithm

   subroutine merge

    * get file types, and depending thereupon, call particular 
        setup subroutine
    * depending on type, check for file consistency. Get time-ordering of 
        input files 
    * merge files and main extensions, using common merge subroutine, merge
        individual columns only when they exist in both datasets. 
      * if type=events, call routines to (optionally) correct individual event 
          file coordinates for small changes in RA, Dec and PA, then reproject 
          sky positions onto single reference point on sky and calculate new 
          WCS parameters. 
      * if type=events, merge EXPOSURE and GTI extensions, using common merge
          subroutine, again checking for availability of extensions and columns
    * change header attributes where necessary, add history
     
   end subroutine merge