fits_header.h File Reference

Classes

• class ltl::FitsHeader

  Representation of a complete FITS header. Holds also header I/O methods. More...
  

Namespaces

• namespace ltl

Defines

• #define FITS_SYNTAX_CHECK

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Detailed Description

Holds FITS header class ltl::FitsHeader and methods.

FITS Syntax

Chars 1 - 8 can be:

• valid (or blank) keyword,
• invalid (or empty) keyword

Valid keywords: mandatory, other reserved, or additional

Mandatory keywords: principal, or conforming extensions.

Principal: all must be fixed format.

• "SIMPLE ": must be 1st in header, followed by
• "BITPIX ": 8, 16, 32, -32, -64, followed by
• "NAXIS ": 0 <= n <1000, integer
• if NAXIS > 0
• "NAXIS1 ", ..., "NAXISnnn"
• ...
• "END " and empty after

Conforming extensions: Support development is on the way...

Other reserved keywords:

• "DATE ": 'YYYY-MM-DD[Thh:mm:ss[.sss]]' or 'DD/MM/YY' before 2000
• "ORIGIN ": character string
• "BLOCKED ": will be discarded
• "DATE-OBS", "DATExxxx": same format as "DATE "
• "TELESCOP", "INSTRUME", "OBSERVER", "OBJECT ": character strings
• "EQUINOX ": floating point equinox in years
• "EPOCH ": will be transformed to "EQUINOX " if "EQUINOX " not present
• "AUTHOR ", "REFERENC": character string
• array keywords ... BSCALE, BZERO, ...

Intensive syntax check is performed only for mandatory keywords and some reserved keywords.

Values: no complex values supported up to now.
Supported: strings, boolian, integers, floating point;
all in fixed or unfixed format.

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Define Documentation

#define FITS_SYNTAX_CHECK