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Translation of IHAP header

The IHAP header contains the description of the data in a fixed, binary format. With reference to the IHAP manual, the translation of this information into MIDAS descriptors are given in Table 7.2.1. IHAP defines the end of exposure which is converted to exposure time. Also, start and end are given for image axes instead of start and number of pixels
 
Table 7.5: Name translation between IHAP header and MIDAS descriptors. Asterisk indicates that the value is transformed (see text).
IHAP header MIDAS descriptor IHAP header MIDAS descriptor
DRASC O_POS(1) JUSR1 IHAPUSER(1)
DECLN O_POS(2) JUSR2 IHAPUSER(2)
JYEAR/JDAT O_TIME(1) DUSR1 IHAPUSER(3)
DCRAT O_TIME(5) DUSR2 IHAPUSER(4)
DSTTM O_TIME(6) AHGC LHCUTS(2)
DENTM O_TIME(7)* ALWC LHCUTS(1)
JDENT IDENT DAIRM O_AIRM
DXSTR/DYSTR START    
DXSTP/DYSTP STEP    
DXEND/DYEND NPIX*    
 

In addition to the main header, keywords and comments may exist. They are saved in the descriptor O_COM in ASCII format.


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1999-06-09