[IGSMAIL-182] GUIDELINES FOR ANNUAL REPORT
Tue Jan 26 00:00:00 PST 1993
From: Najat ESSAIFI
Subject: GUIDELINES FOR ANNUAL REPORT
INTERNATIONAL EARTH ROTATION SERVICE (IERS)
SERVICE INTERNATIONAL DE LA ROTATION TERRESTRE
BUREAU CENTRAL DE L'IERS
OBSERVATOIRE DE PARIS
61, Av. de l'Observatoire 75014 PARIS (France)
Tel. (33) 1-40 51 22 26 Telex : 270776 OBS
Internet : iers at iap.fr
Span : IAPOBS::IERS
FAX : (33) 1 - 40 51 22 32
Paris, 1993 January 26
You are invited to submit earth orientation
results to the Central Bureau of IERS. Guidelines
are enclosed in this mail.
Thank you for your cooperation.
Essaifi Najat (iers at iap.fr)
1 - Meet the deadline : 15 March 1993
IERS cannot guarantee that any result received after the deadline will
be considered in the 1992 Annual Report analysis.
2 - Describe your analysis
Refer to the IERS Standards (1992) and point out the significant
departures of your models and constants from them. Give relevant information
on the data treated. Refer to existing publications for the methods. The precision
in most of the results is around 0.001" and, at this level, every detail is
3 - Follow the guidelines
Prepare the summary sheet for the terrestrial system. Try to follow
the proposed formats, or at least provide the full information requested. The
guidelines and formats are similar to those sent last year. You should not neglect
the correlation coefficients that we request. Provide all results obtained in the
adjustment that pertain to the reference frames or to the EOP, including
4 - Send a copy to the Technique Coordinator
IERS organisation is such that the activities and analyses are
coordinated within each observing technique. It is therefore essential that the
yearly submissions of the Analysis Centres be examined by the IERS
Coordinators. For this reason you are asked to send to the relevant technique
coordinator a copy of the files sent to the Central Bureau. The addresses of the
Coordinators can be found in the IERS Annual Report.
5 - Alternate solutions are welcome
To permit accurate comparison and combination of results, it is
necessary that your main analysis follows the common conventions. However,
additional solutions, with alternate treatment of some aspects, e.g. site
displacements or celestial pole motion, that would help to better understand the
phenomena involved, would be welcome.
Your help in these matters is highly appreciated.
DEADLINE : 1993 MARCH 15!
GUIDELINES FOR SUBMITTING EARTH ORIENTATION RESULTS TO IERS
The submission should include the following.
1 - A description of the analysis method. The recommended constants and
models are those in the IERS Standards (1992). Deviations from them
should be clearly indicated.
2 - A series of the Earth Orientation Parameters (EOP) : coordinates of the
terrestrial pole, universal time, and the celestial pole offsets with respect to
the direction defined by the IAU precession/nutation. Use preferably the
attached format (1).
3 - The set of station coordinates in the terrestrial frame to which the series of
EOP is referred, see attachment 2.
4 - The summary sheet (attachment 3) describing the terrestrial system attached
to the set of station coordinates. This document has been issued by the IAG
Special Study Group 5.123 (Chairman : C. Boucher).
5 - In the case of VLBI, the set of radio sources coordinates in the celestial
frame to which the series of EOP is referred, preferably under the attached
Transmission means (in decreasing order of preference)
- SPAN : IAPOBS::IERS.
- INTERNET : iers at iap.fr.
- FLOPPY DISK : PC format : ASCII files prefered
with 5.25" (360 ko or 1.2 Mo) or with
3.5"(720 ko or 1.44 Mo)
Macintosh format: ASCII files prefered
with 3.5" (800 ko or 1.44 Mo).
- G.E. MARK3 : In the RC28 catalog, with a QUIK-COM
message to IERS-CB.
- MAGNETIC TAPE : 1600/6250 bpi, ASCII/EBCDIC, fixed
blocked, no label.
FORMAT FOR TRANSMITTING SERIES TO THE CENTRAL BUREAU OF IERS
FORMAT OF EARTH ORIENTATION ! FORMAT OF EARTH ORIENTATION FROM GPS
! (identical to the 1992'IGS Campaign one)
Field Contents ! Field Contents
(fields separated by one blank) ! (fields separated by one blank)
1 MJD of the measurement ! 1 MJD of the measurement
2 x of the pole (") ! 2 x of the pole (")
3 y of the pole (") ! 3 y of the pole (")
4 UT1-UTC (s) ! 4 UT1-UTC (s)
5(2) dy (0.001") ! 5 uncertainty on x (")
6(2) de (0.001") ! 6 uncertainty on y (")
7 uncertainty on x (") ! 7 uncertainty on UT (s)
8 uncertainty on y (") ! 8 rms residual of the least squares
9 uncertainty on UT (s) ! solution providing the EOP
10 uncertainty on dy (0.001") ! 9 correlation coefficient : x, y
11 uncertainty on de (0.001") ! 10 correlation coefficient : x, UT1
12 rms residual of the least squares ! 11 correlation coefficient : y, UT1
solution providing the EOP ! 12 number of contributing stations
13 correlation coefficient : x, y ! 13 number of contributing satellites
14 correlation coefficient : x, UT1 ! 14 number of passes
15 correlation coefficient : y, UT1 ! 15 time span
16 correlation coefficient : dy, de !
17(3) integer key (e.g., station, !
baseline, sub-network) !
18(3) integer key (e.g., Lunar reflector)!
1 - All the 18 fields MUST BE FILLED (with 0 in the case when no
information is available for a given field). The numbers of decimals given in
fields 2-11 should be such that the uncertainties have at least two significant
2 - If dy et de were held fixed to an a priori value for some date, this date
and the a priori value should be given in the general explanation.
3 - Contents to be decided by the analysis centre, e.g., station, baseline,
sub-network lunar reflector, number of contributing stations, etc.
FORMAT OF UT0 AND LATITUDE (dphi)
1 ID of the series
3 x (.001") a priori pole coordinates used for the solution (if applicable)
4 y (.001") a priori pole coordinates used for the solution (if applicable)
5 UT0-UTC (ms) as determined in the solution
6 Dphi (.001") as determined in the solution
7 sigma on UT0-UTC (ms)
8 sigma on dphi (.001")
9 correlation coefficient between the parameters determined (UT0, dphi)
10 number of normal points in the solution
11 time span between the first and the last normal points used (hrs)
12 rms of the residuals after the solution (ns)
13 dUT0/dx in arcsec per arcsec
14 dUT0/dy in arcsec per arcsec
15 integer key (e. g., station, baseline)
16 integer key (e. g., Lunar reflector)
It is recommended to submit as much information as possible
concerning the station coordinates.
This information should contain:
A) general description of the solution (common with other IERS
B) specific description concerning the terrestrial system, following if
possible the Attachment 3,
C) description of the station coordinate information (format,
significance of data items)
D) data set as described in C.
The important point is that we would like to get the complete
information you will have produced concerning SSC, for instance if
you have adjusted velocities, or time series of station coordinates.
We can also accept full variance-covariance matrix for these
The description in C should in particular contain a list of parameters
with description and unit (for instance : X at 1988.0, in meter; or
velocity in latitude, in mm per year).
The variance-covariance information should also include the description
of the coefficients (variances or standard deviations, covariances or
correlation parameters) and also specify if and how the variance matrix
has been scaled.
When sending only coordinates, the usual DOMES format as given
below can be used, but it is not mandatory.
Finally, we would really appreciate it that the SLR analysis centers to
help us in the identification of the points to which their coordinates are
related. For that, two cases of tracking points exist :
- fixed SLR system : in this case the coordinates are related to the IAR
(ex. Grasse fixed system CDP 7835). Here, there is no particular problem.
- mobile SLR system : in this case, please tell us if you use eccentricities
between IAR and a ground reference mark and give the description and the
number of the reference mark.
Also we would appreciate it if you could supply us with the values of
these eccentricities. On the other hand, if the eccentricities are not
available to you, please let us know for each point the occupancy you
use by giving the CDP occupation designator (ex. Greenbelt
71050711) or/and the occupation name (ex. ML0711).
For more details and before sending information, don't hesitate to
contact the IERS Terrestrial Frame Section (Claude Boucher or Zuheir
SPAN : IAPOBS::BIHTERRE
INTERNET : bihterre at iap.fr or boucher at iap.fr
TELEMAIL : C.BOUCHER
G. E. MARK3 : IERS - CB
FAX : 33 1 43 98 80 53
TELEX : 261631
Conversely, we would appreciate to identify the person to contact,
particularly for terrestrial reference system aspects.
Proposed format for station coordinates
(Field) (Columns) (Value)
1 1 X
2 2-6 DOMES site number
3 7 DOMES type of point (M or S)
4 8-10 DOMES point number
5 11-20 Alternate designation
6 21-33 X, in metres, decimal point in column 30
7 34-46 Y, in metres, decimal point in column 43
8 47-59 Z, in metres, decimal point in column 56
9 61-67 Central epoch of adjusted observations (MJD,
precision 0.1d, decimal point in column 66)
10 69-75 Time span of ajusted observations (days,
precision 0.1d, decimal point in column 74)
11 81-86 SIG X, in metres, decimal point in column 83
12 88-93 SIG Y, in metres, decimal point in column 90
13 95-100 SIG Z, in metres, decimal point in column 97
SUMMARY SHEET FOR THE DESCRIPTION OF THE TERRESTRIAL SYSTEM
ATTACHED TO A SET OF STATION COORDINATES
1 - Technique :
2 - Analysis Center :
3 - Solution identifier :
4 - Software used :
5 - Relativity Scale :
6 - Permanent tidal correction on station :
7 - Tectonic plate model :
8 - Velocity of light (C) :
9 - Geogravitational constant (GMo) :
10 - Reference epoch :
11 - Adjusted parameters :
12 - Definition of the origin :
13 - Definition of the orientation :
14 - Constraint for time evolution :
FORMAT FOR TRANSMITTING SETS OF RADIOSOURCE COORDINATES
TO THE IERS CENTRAL BUREAU.
Field Contents all fields separated by one blank (1)
1 IAU name
2 Alternate name
3 hours of right ascension (2)
4 minutes of right ascension (2)
5 seconds of right ascension (2)
6 degrees of declination (3)
7 minutes of declination (3)
8 seconds of declination (3)
9 uncertainty on right ascension (s)
10 uncertainty on declination (")
11 correlation : right ascension, declination
12 epoch of coordinates (MJD)
13 mean date of observations of the source (MJD)
14 time span of observations of the source (days)
15 number of sessions
16 number of delays
17 number of delay rates
1 - All the 17 fields should be filled (with 0 when the information is lacking).
2 - These three fields can be replaced by one field, giving the right ascensions in
degrees and decimal fraction (from 0. to 360.)
3 - These three fields can be replaced by one field, giving the declination in
degrees and decimal fraction (from -90. to +90.).
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