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SIRGAS-CON-D and Local Processing Centers, a solution for the densification of the Reference Frame in Latin America and the Caribbean.

M. V. Mackern (1, 3); M. L. Mateo (1, 2); A. V. Calori (1, 2) and A. M. Robin (2)

(1) Universidad Nacional de Cuyo(2) Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales,

CONICET(3) Universidad Juan A. Maza,

IAG2009 Bs As., September 2009

Mendoza, Argentina

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This contribution reports:

1. Motivation2. An introduction about the Densification Network and the

structure of the processing centers.3. Methodology used by the processing centers.4. First results about the last three years, from CIMA Regional PC.

5. Conclusions.

Content

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1. The continuously increasing of SIRGAS regional station number.

2. The incorporation to SIRGAS of new processing centers in Latin American institutions. An excellent opportunity to distribute the hard work.

1-Motivation

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27

35

New regional stations

4 + 2E + 3ExperimentalECU - LUZ - URY

1+3+2 ExperimentalIBGE - IGAC - CIMA - INEG - GMA

1 + 5 ExperimentalDGFI

New Processing Centers

July 2009

2008

2007

YEAR

4

0

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1995

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Year

Num

ber

of s

tatio

ns

IGSRegionalTotal

Increase of SIRGAS stations 1995 - 2009

Users' community

Countries Countries Countries Countries ---- RegionsRegionsRegionsRegions

Geodetic Community

IGSIGSIGSIGSSIRGAS

48

160

10Only 10 were

continuous continuous continuous continuous stationsstationsstationsstations

+27

+35

5

After week 1495TODAY

3 LOCAL AC1 AC and

IGS-RNACC-SIR

SIRGAS-CON. Structure of processing

before week 1495 (August 31, 2008)

DGFI official AC4 Experimental AC

INEGIGAC

IBGE CIMA

IGS-RNAAC-SIR

DGFI

It was established a new

ESTRUCTURE

+ 45 new Stations

In the last 5 yearsEXPERIMENTAL STAGE

(Quality and punctuality)

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1) SIRGAS-CON-Regional Network a contributions to the IGS• Loosely constrained weekly solutions of the densification and core networks.• Combinations calculated by IGS-RNACC-SIR at DGFI and are controlled by IBGE.

2) SIRGAS-CON-Regional Network as a densification o f IGS05 in American countries.•Loosely constrained weekly solutions from each SIRGAS densification network (including new station) are computed.•Weekly solutions are aligned to IGS05. The strategy used is: �constraining reference coordinates (W=1/(±1E-05))�Fiduciales points: IGS05 stations with IGS weekly coordinates

Requirements:• Punctuality and Precision.•Consistency with the IGS global network.

3. FIRST RESULTS

CIMASIRGAS-CON-D-South

3- Methodology

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"Delayintheloadi ngofCPLweeklyr esults"

04

8121620

242832

36404448

52

139513971399140114031405140714091411 1413141514171419142114231425142714291431143314351437 143914411443144514471449145114531455145714591461 1463146514671469147114731475147714791481148314851487 148914911493149514971499150115031505150715091511 1513151515171519

GPSweek

Daysafter

thepublicationof

preciseorbit

delay

Delay in the delivering weekly solutions

0

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1395

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2006 2007 2008 GPS week 2009

Day

s af

ter t

he IG

S F

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Orb

it pu

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atio

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CIMA Delay

CIMASIRGAS-CON-D-South

CIMAExperimental Processing Centre

4-First results. CIMA (Regional Processing Centre)Punctuality on delivering weekly solutions

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0

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rms (N) rms (E) rms (Up)

rms (m

m)

GPS Week

Repeatability in CIMA weekly loosely constrained solutions [mm]

1) Evaluation of the daily coordinate repeatabilityMean values of RMS for daily coordinate repeatability in the CIMA loosely constrained weekly solutions.

Precision: Quality control

2) Evaluation of the loosely constrained weekly soluti ons with respect to:DGFI (36 Common stations)IBGE (21 Common stations)URY (31 Common stations)

Mean values of RMS after Helmert transformation between two groups of coordinates CIMA - DGFICIMA - IBGE andCIMA - URY

2 mm

5.2 mm

4-First results. CIMA (Regional Processing Centre)-QUALITY

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CIMA and IBGEOfficial Processing Centre

Quality control

CIMA-DGFI

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1395

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1539

GPS week

[mm

]

north east up

CIMA-IBGE

0

1

2

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8

1395

1398

1401

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GPS week

[mm ]

north east up

CIMA-URY

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1524

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GPS week

[mm

]

north east up

2 mm

<1 mm

2 mm

<1 mm

<4 mm

<2 mm

CIMA and IBGEExperimental Processing Centre

Agreement between the loosely constrained solutions calculated by CIMA, DGFI, IBGE and URY

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BRAZ has a Strong seasonal variation. Not Used as Fiducial point

ADJUSTMENT ---- Reference FrameReference Frame

Consistency with the IGS global networkAlignment of the weekly solution to the IGS05 Strategy: constraining reference coordinates (weight= 1/ ±1e-05)Fiduciales points: IGS weekly coordinates from IGS05 stations (igsPwwww.snx).CHPI, CONZ, GLPS, ISPA, LPGS, SANT, SCUB, UNSAControl pointsControl points:AREQ, BOGT,BRAZ, CFAG,COPO, CRO1, IQQE, KOUR, MANA, OHI2, PALM Y RIO2 . They appear in IGS weekly solutions.

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Control point: Coordinate agreement SIRGAS-CON-D-South (CIMA) wrt IGS weekly solutions

RMS of the differences between the weekly coordinates of the IGS and the coordinates obtained in the weekly solutions aligned with IGS weekly calculated by CIMA. Analyzed period: 147 weeks (10/2006 to 8/2009)

* OHI2, CRO1, PALM and RIO2 Edges of the networkDeformation is larger

*IQQE has a short period

Mean rms x = 3.5 mmMean rms y = 4.7 mmMean rms z = 2.9 mm

Average value= 3.7 mm

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� The continuously increasing number of SIRGAS-CON stations creates the need to divide the network in several sub-networks that are individually processed and then combined in a consistent solution.

� For that purpose it was necessary to establish new processing and combination centers with the involvement of Latin American institutions.

� Five experimental processing center (INEGI, IGAC, IBGE, IGM-A and CIMA) and two combination centers (DGFI and IBGE) were established.

� After one year period of training and validation, three experimental centers (IGAC, IBGE and CIMA) and both combination centers (DGFIand IBGE) became official after demonstrate high quality, punctuality and continuity standards.

� Five experimental centers are now in process of being validated.

� Thanks to this capacity building process, in the near future every SIRGAS country will have an in-house processing centre.

Concluding remarks

SIRGAS-CON-D and Local Processing Centres, a soluti on from the densification of the Reference Frame in Latin America and the Car ibbean.

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CIMA CIMA Centre of processing Centre of processing IngenierIngenierííaa--MendozaMendoza--ArgentinaArgentina

Muchas gracias !!!Muchas gracias !!!

Thank you for your attention!!Thank you for your attention!!