Keywords: class-projection

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# The new Position section in the CLASS Data Format

In order to achieve the goal described in section , the section Position in the CLASS files is redesigned as described in table . This section is delivered in the version 2 of the observations1. The modifications are:

- the projection angle has been added,
- the coordinate system is duplicated from the index2 into the Position section,
- the descriptive system has been removed; it had no known application up to the present day,
- the items have been reordered for clarity.

Table: New Position section in observations version 2 (since 26-mar-2015 in the GILDAS development branch). The elements are ordered this way, contiguously in the file. The section length is now 14 words (1 word is 4 bytes).
Fortran type | Parameter | Position | Description
C*12 | SOURC | 1-3 | Source name
I*4 | SYSTEM | 4 | Code for coordinate system
R*4 | EQUINOX | 5 | Equinox of coordinates
I*4 | PROJ | 6 | Code for projection system
R*8 | LAM | 7-8 | Lambda of projection center
R*8 | BET | 9-10 | Beta of projection center
R*8 | PROJANG | 11-12 | Projection angle
R*4 | LAMOF | 13 | Offset in Lambda
R*4 | BETOF | 14 | Offset in Beta

As a reminder and for comparison, the description of the old Position section is available in the Appendix .

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