[IGSMAIL-5475]: SINEX 2.01 formatting for igs.snx

[Angelyn W. Moore]

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IGS Electronic Mail      10 Nov 15:24:31 PST 2006      Message Number 5475
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Author: Angelyn Moore

Dear Colleagues,

D. Lavallee pointed out that in the SITE/ID section of the SINEX 2.01 
specification, the I3 allotment for longitude is incompatible with the longitude 
range [-180:+180].  The SINEX experts are aware of it and will address the 
situation officially soon.  It is likely that the field will simply be changed 
to I4, since there is room in the line length.  I have gone ahead and made this 
change in the generation of igs.snx, so that users can have some predictable 
format to use.  Please understand that this is not an official change of the 
SINEX specification at this point, but a local IGS decision.  The igs.snx file 
will follow this specification of the SITE/ID block until further notice:

  _________________S_I_T_E___I_D___D_A_T_A___L_I_N_E_________________|
|                |                                   |              |
|__Field_________|______Description__________________|___Format_____|
|                |                                   |              |
| [Site Code]    | Call sign for a site.             |   1X,A4      |
|________________|___________________________________|______________|
|                |                                   |              |
| [Point Code]   | Physical monument used at a site  |   1X,A2      |
|________________|___________________________________|______________|
|                |                                   |              |
| Unique Monument| Unique alpha-nummeric monument    |   1X,A9      |
| Identification | identification. For ITRF purposes,|              |
|                | it is a nine character DOMES/DOMEX|              |
|                | number (five/six digits, followed |              |
|                | by  the single letter 'M' or 'S', |              |
|                | followed by four/three digits)    |              |
|________________|___________________________________|______________|
|                |                                   |              |
| [Observation   | Observation technique(s) used.    |   1X,A1      |
| Code]          |                                   |              |
|________________|___________________________________|______________|
|                |                                   |              |
| Station        | Free-format description of the    |   1X,A22     |
| Description    | site, typically the town and/or   |              |
|                | country.                          |              |
|________________|___________________________________|______________|
|                |                                   |              |
| Approximate    | Approximate longitude of the site |   1X,I4,     |
| Longitude      | in degrees(E/+), minutes and      |   1X,I2,     |
|                | seconds.                          |   1X,F4.1    |
|________________|___________________________________|______________|
|                |                                   |              |
| Approximate    | Approximate latitude of the site  |   1X,I4,     |
| Latitude       | in degrees(NS/+-), minutes and    |   1X,I2,     |
|                | seconds.                          |   1X,F4.1    |
|________________|___________________________________|______________|
|                |                                   |              |
| Approximate    | Approximate height of the site in |   1X,F7.1    |
| Height         | metres.                           |              |
|________________|___________________________________|______________|
                                                      |              |
                                                      |     76       |
                                                      |______________|


Best regards,
Angie
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Angelyn W. Moore, Ph.D.            Deputy Director, IGS Central Bureau
  JPL/Caltech                               Angelyn.W.Moore at jpl.nasa.gov
  4800 Oak Grove Dr. MS 238-540                   voice: +1 818 354 5434
  Pasadena CA 91109 USA  http://igscb.jpl.nasa.gov  fax: +1 818 393 6686