Rattachement ITRF à Rikitea

Transcription

1 SERVICE DE GEODESIE ET NIVELLEMENT Rattachement ITRF à Rikitea Lien terrestre DORIS - GNSS (REGINA) DORIS - GNSS (REGINA) terrestrial local tie July 20 DIFFUSION OUVERTE N archie Date de création N de ersion /0/20

2 22 2/30 Mots-clé ITRF; DORIS; REGINA; GNSS; Rikitea; Gambier; Polynésie Française Résumé L ITRF2008, dernière réalisation de l International Terrestrial Reference System, menée par le Laboratoire de Recherche en Géodésie (LAREG) de l IGN, est le résultat de la combinaison des référentiels terrestres issus des quatre techniques de géodésie spatiale (c est à dire GNSS, SLR, DORIS et VLBI). Un moyen d améliorer les réalisations consiste à ajouter dans la combinaison les résultats de rattachement sur des sites co-localisés. Aec l aènement du réseau REGINA, la co-localisation GNSS/DORIS est maintenue à Rikitea (Polynésie Française). Le présent rapport décrit le rattachement de précision réalisé lors de la mission d installation de la station GNSS du réseau REGINA. Matériel Système d exploitation Logiciel Mac OS X Word 2008 pour Mac ersion Validation Fonction Nom Visa Commanditaire Chef de l unité RSI Bruno Garayt 23/0/202 signé Rédacteur principal Responsable de production Jean-Claude Poyard 27/0/20 signé Correcteur Responsable opérations REGINA Charles Velut 5//20 signé Approbateur Chef de serice Alain Harmel 02/04/202 signé Vérificateur Responsable qualité Thierry Person 03/04/202 signé IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

3 22 3/30 Diffusion Organisme, serice Nom Numérique Papier IGN / DG Alain Perret oui - IGN / MODSP François Becirspahic oui - IGN / SG / SDOG / CDOC Richard Grimm oui - IGN / DT / SR / LAREG Oliier Jamet oui - IGN / ENSG / DPTS Serge Botton oui - IGN / DPR / SGN Alain Harmel oui - IGN / DPR / SGN Responsable qualité / Thierry Person oui - IGN / DPR / SGN / PMC Responsable documentation / Xaier della Chiesa non 3 IGN / DPR / SGN / PMT Responsable produits / François L Ecu oui - IGN / DPR / SGN Chefs de départements oui - IGN / DPR / SGN Bruno Garayt non IGN / DPR / SGN Jérôme Saunier oui - IGN / DPR / SGN Charles Velut oui - IGN / DPR / SGN Jean-Claude Poyard non IGN / DT / SR / LAREG Zuheir Altamimi non IGN / DT / SR / LAREG Xaier Collilieux oui - CNES REGINA operation oui - CNES / DCT / ME / OT François Boldo oui CNES / DCT / ME / OT Cédric Tourain oui CNES / DCT / ME / OT Thierry Guinle oui - IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

4 22 4/30 Table of contents Introduction... 5 Acknowledgements... 5 CO-LOCATION SITE Site description Site situation CO-LOCATED POINTS DORIS station DORIS reference points DORIS marker GNSS REGINA station (GAMB) Other points of interest SHOM marker Other surey point SURVEY DESCRIPTION Organization Equipment (Instruments) Rikitea obserations polygon Surey method Verticality check and centring equation GPS obserations COMPUTATIONS On-site alidation GPS network Global Adjustment RESULTS Station name translation table Adjusted coordinates and confidence regions APPENDIXES Appendix : site pictures Appendix 2 : "RILB" DORIS station site log (extract) Appendix 3 : "GAMB" GNSS site log (extract) Appendix 4 : adjustment input file Appendix 5 : adjustment output file Appendix 6 : Rikitea SINEX File IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

5 22 5/30 INTRODUCTION The International Terrestrial Reference Frame (ITRF) is the result of a combination of different terrestrial reference frames proided by the four space geodetic techniques (i.e. GNSS, SLR, DORIS and VLBI). To perform this combination between independent reference frames, it is necessary to hae some co-location sites where the arious techniques are operating, from which local tie ectors between their reference points hae been sureyed in three dimensions. In April 2000, the Geographical Surey Institute of Japan (GSI) installed a permanent GNSS station, in the premises of Meteo France at Rikitea. The purpose of this Trimble equipment was to collect data to study the tectonic around Japan. By lack of Internet connection GNSS data were monthly sent to GSI. Mid-July 200, Dr. Machida Morito informed the SIRS about their duty to leae Rikitea. With the adent of REGINA network, in the early July 20 they gae IGN their agreement to use their pillar for the GNSS station allowing by this way the data time series continuity. REGINA project (Reseau GNSS pour l IGS et la Naigation), based on a cooperation between CNES and IGN, aims to increase the size of CNES GNSS stations network with the purpose to proide a proision of consolidated and real time data. With the installation of this new REGINA station, in place of the GSI one, we took the opportunity to surey the reference points of both DORIS and REGINA. So these two different space geodetic techniques are tied by terrestrial obserations proiding a 3D ector. This document presents the Rikitea local tie surey, which took place in August 20, from the obserations on site to the computation with as many details as necessary to fully analyze the resulting SINEX file. ACKNOWLEDGEMENTS We would like to acknowledge Meteo France agency based in Faa a for his inolement for many years in DORIS project and now in REGINA one. I would also add a special thank to Oliier, Pierre and Sylain, all members of MF team at Rikitea, for their warmly welcome, for the equipment management and for their precious help during the surey work or the REGINA and DORIS stations installation and renoation. IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

6 22 6/30 CO-LOCATION SITE. Site description Rikitea site is located by 23 S & 35 W, more than 600 km to the east-south-east of Tahiti, at the far eastern part of the Tuamotu Archipelago. This fourteen islands group with his own language and culture is for this reason often considered as a separate islands group called Gambier Archipelago. The primary illage is Rikitea located on the largest island of Mangarea. With the appearance of pearl culture the Gambier population rises quickly during the last decades to reach more than 200 inhabitants. The Gambier Archipelago, especially the primary island, Mangarea, is of olcanic origin. The highest points, Mt Duff and Mt Mokoto, are rising to more than 400 m. They re along the island s south coast and for our trouble just near the premises of the weather station where both DORIS and REGINA stations are setup. At the Viier du roi there s a tide gauge (GLOSS n 38) run by the Uniersity of Hawaii Sea Leel Center. The marker has been tied with DORIS by IGN in 2007 and 2009 using GNSS obserations (see reports CR/G 230 SGN n 2885 Installation de la station DORIS de Rikitea H. Fagard/JC. Poyard janier 2008 and CR/G 245 SGN n Rénoation de la station DORIS de Rikitea JC. Poyard juin 2009). On a geodetic point of iew, Rikitea site possesses reference points from two space geodetic techniques; indeed there are : a GNSS REGINA station a DORIS station DORIS antenna REGINA antenna IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

7 .2 Site situation 22 7/30 General map of French Polynesia Site location on Mangarea Island Gambier Archipelago IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

8 22 8/30 2 CO-LOCATED POINTS 2. DORIS station 2.. DORIS reference points After an experiment in 995, the first real DORIS (Doppler Orbitography and Radiopositioning Integrated by Satellite) station RIKB was set up on September 23 rd The DORIS antenna is on top of a ery rigid 30 cm sided and 2 m height metal tower. Following a car bump on the tower, the antenna RILB was renoated on March 3 th More recently, just before this surey work the station was upgraded and the DORIS antenna changed. The current reference point is RIMB. The different DORIS points hae been associated with distinct acronym and DOMES number as summarized below : Acronym DOMES number Antenna / Support Period RIKB 9230S002 Starec / ery rigid 2 m height tower from Sep to Mar (with car bump in Jun. 2008) RILB 9230S003 Starec / ery rigid 2 m height tower from Mar to Jul. 20 RIMB 9230S004 Starec / ery rigid 2 m height tower from Aug. 20 till now NB: the antennas reference points were accurately sureyed (precise DORIS internal local ties between the different positions) with respect to the DORIS marker embedded in a concrete block (DOMES number : 9230M00). An extract of the site log is gien in appendix 6.2. Acronym : RIMB DOMES number : 9230S004 General iew Close-up iew (reference point) Description : DORIS antenna reference point (Chelton F675 type). IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

9 2..2 DORIS marker 22 9/30 Point name : DORIS mark DOMES number : 9230M00 General iew Description : DORIS domed mark in concrete block. Close-up iew (reference point) 2.2 GNSS REGINA station (GAMB) This GNSS station, part of the REGINA network, has been installed in Aug. 20 on top of the GSI stainless pillar. Indeed with the departure of GSI from Riktea their pillar was free. In July 20 they confirmed IGN the authorization for using their pillar. Our first idea was to call the REGINA station RIKG but on a request of our colleagues from GSI who treated the RINEX files from April 2000 to 200 with the name GAMB we finally agreed to keep the name GAMB for the station (appendix 6.3). Their agreement to use their pillar for the GNSS station allows a nice data time series continuity. Acronym : GAMB DOMES number : 9230M003 General iew Description : Antenna height is m. Reference point Tie with the DORIS antenna has been sureyed in 2007 and 2009 using GNSS obserations (see reports CR/G 230 SGN n 2885 Installation de la station DORIS de Rikitea and CR/G 245 SGN n Rénoation de la station DORIS de Rikitea). IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

10 22 0/ Other points of interest 2.3. SHOM marker In the south-east part of the meteo station premises there are three concrete blocks with a SHOM marker on each. They were set up during the Pacific Oceanographic Mission (MOP). This geodetic campaign aimed at establishing and realizing a geodetic reference frame for French Polynesia based on GPS and DORIS obserations. We choose for our surey the marker in the block cared MOP Point name : SHOM no DOMES number General iew Description : mark cared SHOM embedded in a concrete block Close-up iew (reference point) Other surey point Most of the points are temporary markers but one of these points could be re-use later if needed. It s a bolt in a concrete block. Point name : RM- no DOMES number General iew Description : bolt in a concrete block Close-up iew (reference point) IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

11 22 /30 3 SURVEY DESCRIPTION 3. Organization All the topometric surey instruments and equipments belong to IGN and were sent for the purpose of the surey that was carried out by JC. Poyard from July 30 th to 3 st, Equipment (Instruments) A Leica tacheometer (TC2002) was used for this work. This instrument, which is regularly calibrated by IGN equipment control unit, was associated with two Leica accurate prisms. It has a standard deiation of 0.5 mgon for horizontal and ertical angles and mm + ppm for distances. The GPS obserations were performed with two Leica 200 receiers and a Leica AX 202 GG antenna or an Ashtech (Reision E) antenna. All these instruments allowed the obserations to be recorded electronically on memory cards or storage deices and were then downloaded to a laptop PC for checkings. 3.3 Rikitea obserations polygon All the surey was conducted in order to proide the highest accuracy in the determination of the 3D ectors between the obsering reference points. Hereafter is the Rikitea obserations polygon. IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

12 3.4 Surey method 22 2/30 All the isible lines of sight were obsered with the tacheometer. Horizontal directions and zenith angles were obsered in data sets, each set consisting in one reading in both direct and reerse theodolite positions. Distance measurements were obsered at least once oer each line. Meteorological data (atmospheric pressure and temperature) used to correct the distances, were recorded at the beginning of each station occupation. Two stations were determined by GPS technique and used to get the polygon s bearing Verticality check and centring equation Using a theodolite the erticality of the DORIS «theoretical» antenna reference point was measured with respect to the corresponding marker. The results of this eccentricity combined with the height aboe the marker forms the centring equations. For the prism on GAMB, the height aboe the marker was 0,236 m and for DORIS the prism was 0,253 m aboe the DORIS plate GPS obserations GPS obserations hae been carried out on the two reference points REFN and REFS with a Leica 200 receier associated with a Leica AX202 GG antenna and for GAMB the receier a Leica 200 associated with an Ashtech Re.E antenna. The following table sums up the GPS obserations. Point Start (UT) End (UT) Ant. Height (m) Ant. Type GAMB DOY 28 DOY 29 0,000 ASH70945E_M 09 : : 47 REFN DOY 28 DOY 28,397 LEIAX202GG 08 : 29 6 : 04 REFS DOY 28 6 : 2 DOY : 30-0,050 LEIAX202GG All antenna heights are related to the antenna reference point. None of the antennas was equipped with a radome. On the two references, the antenna heights are measured but in fact we re mainly interested by the planimetric position! 4 COMPUTATIONS 4. On-site alidation The theodolite obserations were checked on site in order to point out any problem. IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

13 22 3/ GPS network Back to the office, the short GPS baselines were processed with LEICA Geo Office 8. Software using the absolute GNSS antenna calibrations : igs08.atx. The result allows us to determine the bearings from GAMB toward the two references REFS and REFN. 4.3 Global Adjustment The final computation has been carried out by a 3D Least Squares Adjustment with the Microsearch GeoLab 200 ersion software. The input file (see appendix 6.4) deals with : Theodolite obserations : horizontal and zenith angles, distances Centring equations : relatie position between points. Azimuths toward references issued from the GPS baselines process. RILB coordinates constrained at mm to their ITRF2008 (epoch 20:28) alues. The a priori standard deiations used for the different obserations with tacheometers are : 0.8 mgon for horizontal angles.3 mgon for ertical angles mm for distances on prism (These are the alues used for most of the targets in our Microsearch GeoLab computation input file). This adjustment output file (see appendix 6.5) proided coordinates and a coariance matrix of our surey work. 5 RESULTS 5. Station name translation table The following list sums up the most interesting points used in the Microsearch GeoLab input file. In bold, the main points, description, used name or code and computation name (appendix 6.4). Point Description DOMES number Computation name DORIS station RIMB Antenna Reference Point 9230S004 RIMB RILB Antenna Reference Point 9230S003 RILB DORIS domed mark in concrete block 9230M00 DORm GNSS REGINA station GAMB / axis and base of antenna 9230M003 GAMB IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

14 22 4/ Adjusted coordinates and confidence regions The results of the adjustment are the coordinates of all points as well as their confidence ellipsoids in the ITRF2008 at the mean epoch of the obserations (i.e. epoch 20:28). The table below proides the 3D coordinates and confidence region at 95% of the points of interest. RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0004 Adjusted XYZ Coordinates: X-COORDINATE Y-COORDINATE Z-COORDINATE CODE FFF STATION STD DEV STD DEV STD DEV XYZ DORm m XYZ GAMB m XYZ RILB m XYZ RIMB m XYZ RM m XYZ SHOM m RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 00 2-D and -D Station Confidence Regions ( and percent): STATION MAJOR SEMI-AXIS AZ MINOR SEMI-AXIS VERTICAL DORm GAMB RILB RIMB RM SHOM From the aboe coordinates, it s possible to calculate the following ectors : Vector dx (m) dy (m) dz (m) GAMB RIMB RIMB DORIS_marker The whole coariance matrix was computed and then it was possible to extract from it the coariance submatrix for the main points of interest. Finally, this coariance submatrix has been conerted into the SINEX format using the «geotosnx» tool proided by Z. Altamimi. The resulting SINEX file (9230_IGN_20-28.SNX) is presented in appendix 6.6. IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

15 22 5/30 6 APPENDIXES 6. Appendix : site pictures Appendix 2 : "RILB" DORIS station site log (extract) Appendix 3 : "GAMB" GNSS site log (extract) Appendix 4 : adjustment input file Appendix 5 : adjustment output file Appendix 6 : Rikitea SINEX File IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

16 22 6/30 6. Appendix : site pictures General iew of the site with a GNSS station aboe RefN point in the foreground. General iew with from left to right points SHOM, GAMB and DORIS. IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

17 22 7/ Appendix 2 : "RILB" DORIS station site log (extract) Note : only the points most releant to this surey were retained in the following extract. The complete ersion of this site log is aailable at : RIKITEA DORIS site description form 0. Form Prepared by : SIMB (DORIS installation and maintenance department) Date prepared : 04/02/20 Report type : UPDATE. Site location information Site name : RIKITEA Site DOMES number : 9230 Host agency : Meteo-France City : Rikitea State or proince : Mangarea, Gambier Islands Country : FRANCE (Polynesia) Tectonic plate : PCFC Geological information : Geographical coordinates (ITRF) : North Latitude : -23 deg 7' 49'' East Longitude : -34 deg 57' 54'' Ellipsoid height : 82 m Approximate altitude : 92 m 2. DORIS antenna and reference point information 2. Four character ID : RIKB IERS DOMES number : 9230S002 Date installed (dd/mm/yy): 23/09/2006 Date remoed (dd/mm/yy) : 04/06/2008 Height aboe ground mark : m 2.2 Four character ID : RIKB IERS DOMES number : 9230S002 Date installed (dd/mm/yy): 04/06/2008 Date remoed (dd/mm/yy) : /03/2009 Height aboe ground mark : m Notes : 2 GHz offset 54 mm south, 5 mm east, 2 mm up following a car bump on the tower 2.3 Four character ID : RILB Antenna model : Starec 5229 type Antenna serial number : 39 IERS DOMES number : 9230S003 CNES/IGN number : DORIS SSALTO number : 287 Date installed (dd/mm/yy): 3/03/2009 Date remoed (dd/mm/yy) : Antenna support type : 30 cm sided ery rigid metal tower, 2 m high Installed on : 60 cm sided concrete block extending 2 m deep Height aboe ground mark : 2.43 m Ground mark type : Domed brass mark 2 mm diameter Ground mark DOMES number : 9230M00 Notes : New antenna, 5 mm south, 2 mm west of the initial RIKB position IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

18 3. DORIS beacons information 22 8/30 4. ITRF coordinates and elocities of the current DORIS ref. point (RILB) Solution : ITRF2005 Epoch : X = m Y = m Z = m Sig X = m Sig Y = m Sig Z = m VX = m/y VY = m/y VZ = m/y Sig VX = 0.00 m/y Sig VY = 0.00 m/y Sig VZ = 0.00 m/y 5. IERS colocation information 6. Tide Gauge colocation information site log fausse! 7. Local site ties Point description : Domed mark under DORIS antenna DOMES number : 9230M Differential components from the current DORIS ref. point (RILB) to the aboe point (in the ITRS) : dx (m) :.574 dy (m) :.579 dz (m) : Accuracy (m) : Date measured : 4/03/2009 Additional information : Surey by IGN-F 2009 Point description : Permanent GNSS station managed by GSI (Japan) DOMES number : 9230S000 Differential components from the current DORIS ref. point (RILB) to the aboe point (in the ITRS) : dx (m) :.075 dy (m) : dz (m) : Accuracy (m) : Date measured : 4/03/2009 Additional information : Surey by IGN-F 2007 & Meteorological Instrumentation 9. DORIS network contacts IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

19 22 9/ Appendix 3 : "GAMB" GNSS site log (extract) GAMB Site Information Form 0. Form. Site Identification of the GNSS Monument Site Name : Rikitea Four Character ID : GAMB Monument Inscription : IERS DOMES Number : 2930M003 CDP Number : Monument Description : Stainless mast Height of the Monument :.727 Monument Foundation : CONCRETE BLOCK Foundation Depth :.4 Marker Description : none Date Installed : Additional Information : The first GNSS station was installed by the Geographical Surey Institute of Japan (GSI) on Apr Recorded data were sent monthly. Mid-200 GSI had to leae Rikitea. On August 20, CNES and IGS set up an antenna in place of the former one. 2. Site Location Information City or Town : Rikitea State or Proince : Gambier Archipelago Country : French Polynesia Tectonic Plate : Pacific Plate Approximate Position (ITRF) X coordinate (m) : Y coordinate (m) : Z coordinate (m) : Latitude (N is +) : Longitude (E is +) : Eleation (m,ellips.) : Additional Information : ITRF2005 ep coordinates : Located in the meteo station premises 3. GNSS Receier Information 3. Receier Type : TRIMBLE 4000SSI 3.2 Receier Type : TRIMBLE NETR9 Satellite System : GPS+GLONASS Serial Number : 5025K68523 Firmware Version : 4.22 Eleation Cutoff Setting : Date Installed : T00:00Z Date Remoed : (CCYY-MM-DDThh:mmZ) Temperature Stabiliz. : Additional Information : 3.x Receier Type : (A20, from rcr_ant.tab; see instructions) 4. GNSS Antenna Information 4. Antenna Type : TRM GP DOME 4.2 Antenna Type : TRM NONE Serial Number : Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : Marker->ARP North Ecc(m) : Marker->ARP East Ecc(m) : Alignment from True N : 0 Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : Leica Antenna Cable Length : 30m Date Installed : T00:00Z Date Remoed : (CCYY-MM-DDThh:mmZ) Additional Information : 4.x Antenna Type : (A20, from rcr_ant.tab; see instructions) 5. Sureyed Local Ties 5. Tied Marker Name : Tide gauge GLOSS n 38 Mark cared SHOM n Tied Marker Name : SHOM (cared SHOM in a block inscribed MOP 2000) IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

20 22 20/ Tied Marker Name : DORIS MARKER Tied Marker Usage : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc) Tied Marker CDP Number : (A4) Tied Marker DOMES Number : 9230M00 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : 4 Surey method : TRILATERATION Date Measured : T00:00Z Additional Information : Sureyed by IGN (France) 5.4 Tied Marker Name : RILB 5.5 Tied Marker Name : RIMB Tied Marker Usage : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc) Tied Marker CDP Number : (A4) Tied Marker DOMES Number : 9230S004 Differential Components from GNSS Marker to the tied monument (ITRS) dx (m) : dy (m) : dz (m) : Accuracy (mm) : 4 Surey method : TRILATERATION Date Measured : T00:00Z Additional Information : Sureyed by IGN (France) 5.x Tied Marker Name : 6. Frequency Standard 7. Collocation Information 7. Instrumentation Type : DORIS Status : PERMANENT Effectie Dates : Meteorological Instrumentation 9. Local Ongoing Conditions Possibly Affecting Computed Position 0. Local Episodic Effects Possibly Affecting Data Quality. On-Site, Point of Contact Agency Information Agency : METEO STATION, RIKITEA 2. Responsible Agency (if different from.) Agency : Centre National d"etudes Spatiales Preferred Abbreiation : CNES Mailing Address : CNES DCT/OP/EM - 8, aenue Ed. Belin 340 Toulouse Cedex09 France Primary Contact Contact Name : Jean-Paul Cardaliaguet Telephone (primary) : Fax : [email protected] Secondary Contact Contact Name : Bruno Garayt Telephone (primary) : [email protected] 3. More Information IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

21 22 2/ Appendix 4 : adjustment input file *RIKITEA METEO STATION GROUND CONTROL SURVEY PERFORMED IN AUGUST 20 TITL RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY COMP ADJ ELIP GRS MAXI 30 CONF YES YES YES YES NO PSOL NO YES PMIS NO NO PRES YES NO PADJ NO NO YES NO YES NO VARF YES YES NO RTST TAU MAX LUNT m CONV CLEV ANGT GRD LDEC 4 **************************************************************************************************** * LIST OF POINTS for the SURVEY ADJUSTMENT, ITRF ACRONYMS, n DOMES and POINTS DESCRIPTION * **************************************************************************************************** * PERMANENT GPS * GAMB: REGINA GNSS station mark (DOMES 9230M003) * (= Top of stainless mast = antenna's axis and base at ARP) * DORIS **RIKB: former DORIS Starec antenna reference point (Sep to Jun = SOLN) (DOMES 9230S002) **RIKB_SOLN2 : former DORIS Starec antenna reference point (Jun to Mar. 2009) (DOMES 9230S002) * RILB : former DORIS Starec antenna reference point (Mar to Jul. 20) (DOMES 9230S003) * RIMB : current DORIS Chelton antenna reference point (as of ) (DOMES 9230S004) * DORm : IGN hexagonal domed mark below the DORIS antennas (DOMES 9230M00) * PERMANENT MARKS * SHOM: mark cared SHOM embedded in a concrete block inscribed "MOP 2000" * TEMPORARY MARKS * TM_: temporary mark = wood stick in the ground * RM_: It's not a marker but a "nail" that could be re-use later. * RefN: temporary mark = wood stick in the ground * RefS: temporary mark = wood stick in the ground * GAMB_Prism : Prism 0,236 m aboe GAMB * DORIS_Prism : Prism 0,38 m below RIMB (or 0,253 m aboe DORIS plate) * DORIS_th = DORIS_Prism 0,38 m below RIMB (or 0,253 m aboe DORIS plate) **********************AZIMUT DEDUCTED FROM THE GPS DETERMINATION***************************** AZIM GAMB_prism RefN AZIM GAMB_prism RefS ************************FORCED ITRF2008 EPOCH 20:28 COORDINATES*************************** 3DC XYZ 000 RILB m COV CT DIAG ELEM *****************************APPROXIMATE COORDINATES**************************************** PLH 000 DORm S W m 0 PLH 000 DORIS_prism S W m 0 PLH 000 DORIS_th S W m 0 PLH 000 GAMB S W m 0 PLH 000 GAMB_prism S W m 0 *PLH 000 RIKB S W m 0 *PLH 000 RIKB_SOLN2 S W m 0 *PLH 000 RILB S W m 0 PLH 000 RIMB S W m 0 PLH 000 RM- S W m 0 *PLH 000 Ref s w m 0 PLH 000 RefN S W m 0 PLH 000 RefS S W m 0 PLH 000 SHOM S W m 0 PLH 000 TM- S W m 0 IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

22 22 22/30 *************************************CENTRING EQUATIONS*************************************** * DORIS antennas excentricities and height with respect to DORm (MARKER) 3DD PLH 000 RIMB s w PLH 000 RILB s w PLH 000 DORIS_th s w PLH 000 DORIS_prism s w PLH 000 DORm s w COV LG DIAG ELEM ELEM ELEM ELEM * GAMB_prism is centred and m aboe GAMB 3DD PLH 000 GAMB_prism S W PLH 000 GAMB S W COV LG DIAG ELEM *Tours d'horizon SIGM AH 8.0 *HIST NEW DSET AH *DIR SHOM Ref DIR SHOM RefS DIR SHOM GAMB_prism DIR SHOM DORm DIR SHOM DORIS_prism DSET AH *DIR SHOM Ref DIR SHOM TM DIR SHOM RM DSET AH *DIR TM- Ref DIR TM- RefS DIR TM- DORIS_prism DIR TM- DORm DIR TM- GAMB_prism DSET AH *DIR TM- Ref DIR TM- SHOM DIR TM- RM DSET AH *DIR RM- Ref DIR RM- GAMB_prism DIR RM- DORIS_prism *DSET AH *DIR RM- Ref DIR RM- SHOM DIR RM- TM DIR RM- RefN DSET AH DIR DORIS_th RefS DIR DORIS_th GAMB_prism DIR DORIS_th RefN *HIST GEN Tours d'horizon *Instrument or Target/prism heights HI SHOM.435 m HI RM-.544 HT SHOM.435 HT RM-.544 Zenithales SIGM ZA 3.0 *HIST NEW *ZANG ZA SHOM Ref ZANG ZA SHOM RefS ZANG ZA SHOM GAMB_prism ZANG ZA SHOM DORm ZANG ZA SHOM DORIS_prism *ZANG ZA SHOM Ref ZANG ZA SHOM TM ZANG ZA SHOM RM *ZANG ZA TM- Ref ZANG ZA TM- RefS ZANG ZA TM- DORIS_prism ZANG ZA TM- DORm IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

23 22 23/30 ZANG ZA TM- GAMB_prism *ZANG ZA TM- Ref ZANG ZA TM- SHOM ZANG ZA TM- RM *ZANG ZA RM- Ref ZANG ZA RM- GAMB_prism ZANG ZA RM- DORIS_prism *ZANG ZA RM- Ref ZANG ZA RM- SHOM ZANG ZA RM- TM ZANG ZA RM- RefN ZANG ZA DORIS_th RefS ZANG ZA DORIS_th GAMB_prism ZANG ZA DORIS_th RefN *HIST GEN Zénithales Distances SIGM DP *HIST NEW DIST DP SHOM GAMB_prism DIST DP SHOM DORIS_prism DIST DP SHOM TM DIST DP SHOM RM DIST DP TM- DORIS_prism.992 DIST DP TM- GAMB_prism DIST DP TM- SHOM DIST DP TM- RM DIST DP RM- GAMB_prism DIST DP RM- DORIS_prism DIST DP RM- SHOM DIST DP RM- TM DIST DP DORIS_th GAMB_prism *HIST GEN Distances HIST ALL Toutes les obserations END IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

24 22 24/ Appendix 5 : adjustment output file RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 000 Wed Feb 22 4:3: Input file: X:\Ratt_tt\Ratt_tt.iob Output file: X:\Ratt_tt\Ratt_tt.lst Options file: C:\Program Files\Microsearch\GeoLab\default.gpj PARAMETERS OBSERVATIONS Description Number Description Number No. of Stations 2 Directions 20 Coord Parameters 36 Distances 3 Free Latitudes 2 Azimuths 2 Free Longitudes 2 Vertical Angles 0 Free Heights 2 Zenithal Angles 20 Fixed Coordinates 0 Angles 0 Astro. Latitudes 0 Heights 0 Astro. Longitudes 0 Height Differences 0 Geoid Records 0 Auxiliary Params. 0 All Aux. Pars. 6 2-D Coords. 0 Direction Pars. 6 2-D Coord. Diffs. 0 Scale Parameters 0 3-D Coords. 3 Constant Pars. 0 3-D Coord. Diffs. 5 Rotation Pars. 0 Translation Pars Total Parameters 42 Total Obserations Degrees of Freedom = SUMMARY OF SELECTED OPTIONS OPTION SELECTION Computation Mode Adjustment Maximum Iterations 30 Conergence Criterion Residual Rejection Criterion Tau Max Confidence Region Types D 2D 3D Station Variance Factor (VF) Known Yes Scale Coariance Matrix With VF Yes Scale Residual Variances With VF No Force Conergence in Max Iters No Distances Contribute To Heights No Compute Full Inerse Yes Optimize Band Width Yes RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0002 Generate Initial Coordinates Yes Re-Transform Obs After st Pass Yes Geoid Interpolation Method Bi-Quadratic RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0003 Adjusted PLH Coordinates: LATITUDE LONGITUDE ELIP-HEIGHT CODE FFF STATION STD DEV STD DEV STD DEV PLH 000 DORIS_prism S W m PLH 000 DORIS_th S W m PLH 000 DORm S W m PLH 000 GAMB S W m IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

25 22 25/30 PLH 000 GAMB_prism S W m PLH 000 RILB S W m PLH 000 RIMB S W m PLH 000 RM- S W m PLH 000 RefN S W m PLH 000 RefS S W m PLH 000 SHOM S W m PLH 000 TM- S W m RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0004 Adjusted XYZ Coordinates: X-COORDINATE Y-COORDINATE Z-COORDINATE CODE FFF STATION STD DEV STD DEV STD DEV XYZ DORIS_prism m XYZ DORIS_th m XYZ DORm m XYZ GAMB m XYZ GAMB_prism m XYZ RILB m XYZ RIMB m XYZ RM m XYZ RefN m XYZ RefS m XYZ SHOM m XYZ TM m RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0005 Residuals (critical alue = 3.305): NOTE: Obseration alues shown are reduced to mark-to-mark. OBSERVATION RESIDUAL STD RES TYPE AT FROM TO STD DEV STD DEV PPM AZIM GAMB_prism RefN * AZIM GAMB_prism RefS * XCT RILB * YCT RILB * ZCT RILB * ELAT RIMB RILB * ELON RIMB RILB * EHGT RIMB RILB * ELAT RIMB DORIS_th ELON RIMB DORIS_th EHGT RIMB DORIS_th ELAT RIMB DORIS_prism IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

26 22 26/ ELON RIMB DORIS_prism EHGT RIMB DORIS_prism ELAT RIMB DORm ELON RIMB DORm EHGT RIMB DORm ELAT GAMB_prism GAMB * ELON GAMB_prism GAMB * EHGT GAMB_prism GAMB * DIR SHOM RefS DIR SHOM GAMB_prism DIR SHOM DORm RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0006 Residuals (critical alue = 3.305): NOTE: Obseration alues shown are reduced to mark-to-mark. OBSERVATION RESIDUAL STD RES TYPE AT FROM TO STD DEV STD DEV PPM DIR SHOM DORIS_prism DIR SHOM TM DIR SHOM RM DIR TM- RefS DIR TM- DORIS_prism DIR TM- DORm DIR TM- GAMB_prism DIR TM- SHOM DIR TM- RM DIR RM- GAMB_prism DIR RM- DORIS_prism DIR RM- SHOM DIR RM- TM DIR RM- RefN DIR DORIS_th RefS DIR DORIS_th GAMB_prism DIR DORIS_th RefN ZANG SHOM RefS ZANG SHOM GAMB_prism ZANG SHOM DORm ZANG SHOM DORIS_prism ZANG SHOM TM RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0007 Residuals (critical alue = 3.305): NOTE: Obseration alues shown are reduced to mark-to-mark. OBSERVATION RESIDUAL STD RES TYPE AT FROM TO STD DEV STD DEV PPM ZANG SHOM RM IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

27 22 27/ ZANG TM- RefS ZANG TM- DORIS_prism ZANG TM- DORm ZANG TM- GAMB_prism ZANG TM- SHOM ZANG TM- RM ZANG RM- GAMB_prism ZANG RM- DORIS_prism ZANG RM- SHOM ZANG RM- TM ZANG RM- RefN ZANG DORIS_th RefS ZANG DORIS_th GAMB_prism ZANG DORIS_th RefN DIST SHOM GAMB_prism DIST SHOM DORIS_prism DIST SHOM TM DIST SHOM RM DIST TM- DORIS_prism DIST TM- GAMB_prism DIST TM- SHOM DIST TM- RM =========== RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0008 =========== Residuals (critical alue = 3.305): NOTE: Obseration alues shown are reduced to mark-to-mark. OBSERVATION RESIDUAL STD RES TYPE AT FROM TO STD DEV STD DEV PPM DIST RM- GAMB_prism DIST RM- DORIS_prism DIST RM- SHOM DIST RM- TM DIST DORIS_th GAMB_prism =========== RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 0009 =========== --- ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ::: ***:: * :*: --- * ::* :::* :::* IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

28 22 28/30 R ::: ::: e ::* ::: * l ::: ::: a ::: ::: t :*: ::: * i ::: --- ::: *:: ::: ::: * e ::: ::: ::: ::: ::: ::: F *::: ::: ::: * r ::: ::: ::: e * ::: ::: ::: * q ::: ::: ::: u * ::: ::: ::: * e ::: ::: ::: n ::: ::: ::: c * ::: ::: ::: --- * y ::: ::: ::: ::: * ::: ::: ::: ::: * ::: ::: ::: ::: * ::: ::: ::: ::: --- * ::: * ::: ::: ::: ::: ::: * ::: ::: ::: ::: ::: ::: ::: * ::: ::: ::: ::: ::: * :::* ::: ::: ::: ::: ::: * ::* --- ::: ::: ::: ::: ::: * :*: ::: ::: ::: ::: ::: ::: * --***:: --- ::: ::: ::: ::: ::: ::: --*** Toutes les obserations (73 residuals) =========== RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 000 =========== S T A T I S T I C S S U M M A R Y Residual Critical Value Type Tau Max Residual Critical Value Number of Flagged Residuals 0 Conergence Criterion Final Iteration Counter Value 5 Confidence Leel Used Estimated Variance Factor.3372 Number of Degrees of Freedom Chi-Square Test on the Variance Factor: e-0 <.0000 < e+00? THE TEST PASSES NOTE: All confidence regions were computed using the following factors: Variance factor used = D expansion factor = D expansion factor = D expansion factor = Note that, for relatie confidence regions, precisions are computed from the ratio of the major semi-axis and the spatial distance between the two stations =========== RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 00 =========== 2-D and -D Station Confidence Regions ( and percent): STATION MAJOR SEMI-AXIS AZ MINOR SEMI-AXIS VERTICAL DORIS_prism DORIS_th DORm GAMB GAMB_prism RILB RIMB IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

29 22 29/30 RM RefN RefS SHOM TM =========== RIKITEA METEO STATION (FRENCH POLYNESIA) - AUGUST 20 SURVEY Microsearch GeoLab, V GRS80 UNITS: m,grad Page 002 =========== 3D Station Confidence Regions ( percent): STATION MAJ-SEMI (AZ,VANG) MED-SEMI (AZ,VANG) MIN-SEMI (AZ,VANG) DORIS_prism (28, 0) ( 38, 0) (307, 90) DORIS_th (30, 0) ( 40, 0) (7, 90) DORm (39, 0) (229, 0) (345, 90) GAMB (8, 90) (302, 0) (22, 0) GAMB_prism (22, 0) (22, 0) (39, 90) RILB (304, 0) (205, 90) ( 34, 0) RIMB (304, 0) (200, 90) ( 34, 0) RM ( 83, 0) (73, 0) (294, 90) RefN (335, 0) ( 69, 90) (245, 0) RefS (7, 0) ( 60, 90) (26, 0) SHOM (44, 0) ( 54, 0) (244, 90) TM ( 9, 0) ( 99, 0) (27, 90) Wed Feb 22 4:3: IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]

30 22 30/ Appendix 6 : Rikitea SINEX File %=SNX.00 IGN 2:053:00000 IGN :28:00000 :28:00000 C 0002 * FILE/COMMENT * File created by geotosnx software (Z.Altamimi) * Original input file: ratt_tt.co * Matrix Scalling Factor used: FILE/COMMENT * SITE/ID *CODE PT DOMES T _STATION DESCRIPTION APPROX_LON_ APPROX_LAT APP_H_ RILB A 9230S S DORm A 9230M M GAMB A 9230M M RIMB A 9230S S SITE/ID * SOLUTION/EPOCHS *Code PT SOLN T Data_start Data_end Mean_epoch -SOLUTION/EPOCHS * SOLUTION/ESTIMATE *INDEX TYPE CODE PT SOLN _REF_EPOCH UNIT S ESTIMATED VALUE STD_DEV STAX RILB A :28:00000 m E E-02 2 STAY RILB A :28:00000 m E E-02 3 STAZ RILB A :28:00000 m E E-02 4 STAX DORm A :28:00000 m E E-02 5 STAY DORm A :28:00000 m E E-02 6 STAZ DORm A :28:00000 m E E-02 7 STAX GAMB A :28:00000 m E E-02 8 STAY GAMB A :28:00000 m E E-02 9 STAZ GAMB A :28:00000 m E E-02 0 STAX RIMB A :28:00000 m E E-02 STAY RIMB A :28:00000 m E E-02 2 STAZ RIMB A :28:00000 m E E-02 -SOLUTION/ESTIMATE * SOLUTION/MATRIX_ESTIMATE L COVA *PARA PARA2 PARA2+0 PARA2+ PARA E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E E-05 -SOLUTION/MATRIX_ESTIMATE L COVA %ENDSNX IGN SERVICE DE GEODESIE ET NIVELLEMENT, 73 aenue de Paris, 9465 Saint-Mandé Cedex Tél : [email protected]