Subject: Re: Dyonisos and other long-term observing DORIS stations
From: Martine Feissel-Vernier <[email-masked]>
To: Jayles Christian <[email-masked]>
Cc: pwillis <[email-masked]>, Herve Fagard <[email-masked]>, Coutin-Faye Sophie <[email-masked]>, [email-masked], [email-masked]
Date: Sat, 5 Nov 2005 09:43:13 +0100

Dear colleagues

To help in the examination of the relative merits of the DORIS sites
and stations in the long term, you may find it useful to consider a
set of global analyses that were prepared by the IDS Analysis
Coordination team in 2005. They are available through URL

                  http://lareg.ensg.ign.fr/IDS/ITRF2004.html

They include plots of weekly residuals at
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/graphs/
with explanation at
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/graphs_readme.html

and stability analyses at
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/lcawd12.a.txt
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/ignwd05.a.txt
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/inawd03.a.txt

Two columns may be of special interest in this discussion:
- %Ms giving the percentage of missing weeks in the series
- Stb ind (last column) giving the station stability index. Small
stability indices are for stable stations.

The explanation of these tables is at
                  http://lareg.ensg.ign.fr/IDS/ITRF2004/core_net_readme.pdf

Finally, I send a copy of this message to [email-masked]
which I believe was set up exactly for this type of discussion.

Best regards
Martine Feissel-Vernier
IDS Analysis Coordinator, Feb 2002-Oct 2005
-----------------------------------------------------------------------------------------------------

2005/11/4, Jayles Christian <[email-masked]>:
>
>  Hello Pascal,
>
>  thank you for your interesting results. My point is that :
>
> 1) if you remove from this list the stations that have already been moved to new sites (PURPLE MOUNTAIN,
> >  RICHMOND, GOLDSTONE), or probably going to (AREQUIPA), the list would be significatively shorter.
> >
> 2) I really agree that we look for the best colocations possible when we talk about
>  - new sites : we have still gaps in the DORIS cover.
>  - or not working sites : AREQUIPA for instance.
>
>  But for stations that are properly functioning, I maintain that it is not pertinent to move them away.
>  DORIS needs long-term stability (TOPEX retrievals for instance), and a new monumentation would be
>  more adequate. With such a policy, we could better concentrate our efforts in improving the global coverage.
>
>                                             Sincerely,
>
>                                                          Christian Jayles
>
>
>
> > ----------
> > De :  Pascal Willis[SMTP:[email-masked]]
> > Date :        vendredi 4 novembre 2005 18:41
> > A :   Jayles Christian
> > Cc :  Herve Fagard; Tavernier Gilles; Coutin-Faye Sophie; [email-masked]
> > Objet :       Dyonisos and other long-term observing DORIS stations
> >
> > Hi Christian,
> >
> > here are the stations which have more than 480
> > weeks of results (using the last data available),
> > sorted by number of available weekly solutions
> > (last are the best). The number of weeks is the
> > 4th column
> >
> > EVEB    21501   EVEREST       484     12.28   2.11    3.76    2.16
> > AREA    42202   AREQUIPA        488     10.10   2.56    4.44    2.75
> > PURA    21604   PURPLE MOUNTAIN 504     12.07   2.42    3.93    2.64
> > DIOA    12602   DIONYSOS        533     12.71   1.97    2.91    2.02
> > KITA    12334   KITAB         536     12.71   1.84    2.71    1.71
> > SPIA    10317   NY-ALESUND      537     12.71   1.64    1.34    2.19
> > MANA    22006   MANILLE       539     12.36   2.78    4.91    3.17
> > GOLA    40405   GOLDSTONE       543     11.67   1.96    2.77    1.98
> > SANA    41705   SANTIAGO        544     12.71   2.33    3.13    1.99
> > CACB    41609   CACHOEIRA       547     12.71   3.30    5.64    3.19
> > RIDA    40499   RICHMOND        566     12.04   2.16    3.02    2.04
> > EASA    41703   EASTER ISLAND   577     12.71   2.52    3.45    2.27
> > CIBB    23101   CIBINONG        583     12.71   2.10    2.79    2.16
> > KRUB    97301   KOUROU        583     12.71   2.53    3.36    2.31
> > ADEA    91501   TERRE ADELIE    585     12.71   1.90    2.22    1.44
> > KERA    91201   KERGUELEN       591     12.34   2.51    2.98    2.01
> > META    10503   METSAHOVI       591     12.71   1.72    2.37    1.85
> > SYOB    66006   SYOWA         594     12.40   1.71    1.79    1.50
> > REYA    10202   REYKJAVIK       598     12.71   1.77    2.17    1.81
> > ROTA    66007   ROTHERA       600     12.71   1.75    1.87    1.44
> > DJIA    39901   DJIBOUTI        613     12.71   2.25    3.09    2.50
> > TRIA    30604   TRISTAN DA CUNHA        618     12.71   2.10    2.60    1.99
> > RIOA    41507   RIO GRANDE      626     12.71   1.94    2.51    1.77
> > FAIA    40408   FAIRBANKS       630     12.71   1.61    1.68    1.69
> > YARA    50107   YARRAGADEE      633     12.71   2.07    2.40    1.85
> > REUA    97401   LA REUNION      634     12.71   2.15    2.99    1.92
> > LIBA    32809   LIBREVILLE      639     12.71   1.97    2.91    1.89
> > HBKA    30302   HARTEBEESTHOEK  641     12.71   2.24    2.62    1.65
> > KOKA    40424   KAUAI         645     12.71   2.30    3.93    2.17
> > YELA    40127   YELLOWKNIFE     659     12.71   1.50    1.95    1.55
> > TLHA    10003   TOULOUSE        663     12.71   1.67    2.76    1.61
> >
> > Dyonisos is in this list but far from being a critical one
> >
> > You will see that it is not the only one with a long time history
> >
> > There is also a discontinuity for Dyonisos and
> > several large data gaps (either in data or >
> > rejected in the solution)
> >
> > new station DIO1 starting at 04-APR-1995
> > discontinuity of 21 weeks found: from 15-OCT-1996
> > to 12-MAR-1997 station is DIO1
> > discontinuity of 43 weeks found: from 02-APR-1997
> > to 28-JAN-1998 station is DIO1
> > discontinuity of 38 weeks found: from 09-SEP-2003
> > to 01-JUN-2004 station is DIO1
> >
> > Best regards
> > Pascal
> >
> > >  Hi Pascal,
> > >
> > >
> > >  several stations in your list have gaps in
> > >their time series (AREQUIPA, COLOMBO, BADARY,
> > >  CACHOEIRA, DJIBOUTI, ...). And several of them have already been moved on
> > >  new sites (PURPLE MOUNTAIN, NOUMEA, GOLDSTONE, GALAPAGOS ...)
> > >
> > >  When I look at Laurent's data, only KOUROU, RICHMOND and ROTHERA totalize
> > >  more than 120 months. DIONYSOS is fourth on the
> > >list, with 120 months and almost no gap.
> > >
> > >  My opinion remains that when a station gives
> > >good results wrt disponibility, it is a better
> > >policy
> > >  to renew it than to move it on another site.
> > >DORIS needs long-term stability, and
> > >operationality.
> > >
> > >                                             Best regards,
> > >
> > >                                                             Christian
> > >
> > >>  ----------
> > >>  De :      Pascal Willis[SMTP:[email-masked]]
> > >>  Date :    vendredi 4 novembre 2005 16:20
> > >>  A :       Jayles Christian
> > >  > Cc :     Herve Fagard; Tavernier Gilles;
> > >Coutin-Faye Sophie; Jayles Christian;
> > >[email-masked]
> > >>  Objet :   Re: DIONYSOS
> > >>
> > >>     Bonjour à tous,
> > >>
> > >>
> > >>     comme je l'ai déjà dit en Groupe
> > >>Mission, on ne peut pas ignorer 10 ans de
> > >>mesures DORIS
> > >>
> > >>     faites par Dionysos : les stations à
> > >>longues séries temporelles sont rares,
> > >>gardons-en quelques-unes SVP.
> > >>
> > >>
> > >>  Hi Christian,
> > >>
> > >>  for your information, here are the DORIS
> > >>stations that observed more than 10 years:
> > >>
> > >>  acronym         domes   DORIS station   #weeks
> > >>data span       latitude RMS    longitude RMS
> > >>vertical RMS
> > >>  AREA    42202   AREQUIPA        488     10.10   2.56    4.44    2.75
> > >>  PAPB    92201   PAPEETE 479     10.12   3.02    2.74    2.03
> > >>  GOLA    40405   GOLDSTONE       543     11.67   1.96    2.77    1.98
> > >>  COLA    23501   COLOMBO 461     11.79   1.95    2.54    1.75
> > >>  BADA    12338   BADARY  442     12.04   2.11    2.68    1.99
> > >>  RIDA    40499   RICHMOND        566     12.04   2.16    3.02    2.04
> > >>  PURA    21604   PURPLE MOUNTAIN 504     12.07   2.42    3.93    2.64
> > >>  EVEB    21501   EVEREST 484     12.28   2.11    3.76    2.16
> > >>  KERA    91201   KERGUELEN       591     12.34   2.51    2.98    2.01
> > >>  MANA    22006   MANILLE 539     12.36   2.78    4.91    3.17
> > >>  SYOB    66006   SYOWA   594     12.40   1.71    1.79    1.50
> > >>  GALA    42004   SAN CRISTOBAL   430     12.57   1.88    3.14    1.86
> > >>  AMSA    91401   AMSTERDAM       324     12.69   2.47    2.56    1.85
> > >>  ADEA    91501   TERRE ADELIE    585     12.71   1.90    2.22    1.44
> > >>  CACB    41609   CACHOEIRA       547     12.71   3.30    5.64    3.19
> > >>  CIBB    23101   CIBINONG        583     12.71   2.10    2.79    2.16
> > >>  DIOA    12602   DIONYSOS        533     12.71   1.97    2.91    2.02
> > >>  DJIA    39901   DJIBOUTI        613     12.71   2.25    3.09    2.50
> > >>  EASA    41703   EASTER ISLAND   577     12.71   2.52    3.45    2.27
> > >>  FAIA    40408   FAIRBANKS       630     12.71   1.61    1.68    1.69
> > >>  HBKA    30302   HARTEBEESTHOEK  641     12.71   2.24    2.62    1.65
> > >>  HELA    30606   SAINTE-HELENE   455     12.71   2.09    3.13    2.00
> > >>  KITA    12334   KITAB   536     12.71   1.84    2.71    1.71
> > >>  KOKA    40424   KAUAI   645     12.71   2.30    3.93    2.17
> > >>  KRUB    97301   KOUROU  583     12.71   2.53    3.36    2.31
> > >>  LIBA    32809   LIBREVILLE      639     12.71   1.97    2.91    1.89
> > >>  MARA    30313   MARION ISLAND   467     12.71   2.86    3.48    1.99>
> > >>  META    10503   METSAHOVI       591     12.71   1.72    2.37    1.85
> > >>  MORA    51001   PORT MORESBY    395     12.71   2.88    3.16    2.27
> > >>  NOWB    92701   NOUMEA  380     12.71   2.75    3.81    2.75
> > >>  REUA    97401   LA REUNION      634     12.71   2.15    2.99    1.92
> > >>  REYA    10202   REYKJAVIK       598     12.71   1.77    2.17    1.81
> > >>  RIOA    41507   RIO GRANDE      626     12.71   1.94    2.51    1.77
> > >>  ROTA    66007   ROTHERA 600     12.71   1.75    1.87    1.44
> > >>  SAKA    12329   SAKHALINSK      418     12.71   2.61    2.44    2.06
> > >>  SANA    41705   SANTIAGO>         544     12.71   2.33    3.13    1.99
> > >>  SPIA    10317   NY-ALESUND      537     12.71   1.64    1.34    2.19
> > >>  TLHA    10003   TOULOUSE        663     12.71   1.67    2.76    1.61
> > >>  TRIA    30604   TRISTAN DA CUNHA        618     12.71   2.10    2.60    1.99
> > >>  YARA    50107   YARRAGADEE      633     12.71   2.07    2.40    1.85
> > >>  YELA    40127   YELLOWKNIFE     659     12.71   1.50    1.95    1.55
> > >>
> > >>  It is not a small number and 1 change is not
> > >>going to affect the whole picture.
> > >>
> > >>  Best regards
> > >>  Pascal
> > >>
> > >>  NB: some of the IDS Governing Board members
> > >>may not be too familiar with French
> > >>
> > >>
> > >>     comme je l'ai déjà dit en Groupe
> > >>Mission, de plus, Dionysos est caractérisé par
> > >>un organisme
> > >>     hôte extrèmement réactif, la moindre
> > >>panne est immédiatement réparée et on ne peut
> > >>absolument
> > >>     pas la comparer à une station nouvelle
> > >>sur laquelle nous n'aurions aucun recul
> > >>opérationnel.
> > >>
> > >>     comme je l'ai déjà dit en Groupe
> > >>Mission, nous ne pouvons pas nous permettre
> > >>d'oublier tel ou tel critère (séries longues
> > >>
> > >>     et opérationnalité) et de ne regarder
> > >>qu'un critère partiel (colocalisation). Pour
> > >>apprécier GLOBALEMENT
> > >  >   les avantages et les inconvénients de
> > >telle ou telle station, un outil Excel est en
> > >cours de mise au
> > >>     point (GT) et je vous encourage à le
> > >>renseigner déjà avec les informations dont on
> > >>dispose pour Dionysos.
> > >>     On pourra alors peut-être comparer objectivement.
> > >>
> > >>     Le réseau DORIS a un atout : sa
> > >>stabilité à long terme. En tout état de cause,
> > >>si je peux parler au nom du système, la demande
> > >>est
> > >>     "SVP remonumentez Dionysos et installons-y une balise 3.0".
> > >>
> > >>                                             amicalement, à tous,
> > >>
> > >>
> > >>Christian Jayles
> > >>
> > >>
> > >>
> > >>  --
> > >>  Pascal Willis
> > >>  Jet Propulsion Laboratory, MS 238-646     Ph : 1-818-393-4748
> > >>  4800 Oak Grove Drive                      FAX: 1-818-393-4965
> > >>  Pasadena CA 91109                         Em : [email-masked]
> > >>
> >
> >
> > --
> > Pascal Willis
> > Jet Propulsion Laboratory, MS 238-646     Ph : 1-818-393-4748
> > 4800 Oak Grove Drive                      FAX: 1-818-393-4965
> > Pasadena CA 91109                         Em : [email-masked]
> >
>
>
>
>