Development of permanent GNSS stations Network in Republic of Moldova Vasile Chiriac Technical University of Moldova Agency for Land Relations and Cadastre (ARLC)

Subjects Geodetic Infrastructure in Moldova Reference Systems and map projections The National Geodetic Network The National Leveling Network The National Gravity Network GNSS Network Concept GNSS Network design MOLDPOS Architecture MOLDPOS RTK/VRS Network Integration with EPN Conclusions

Geodetic Infrastructure in Moldova Reference Systems and Map Projections ETRS 89 ITRS 97 WGS 84 GRS80GRS80 SC 42 KrasowskyKrasowsky WGS84WGS84 Ellipsoids Map projections UTMUTM TMMTMM Gauss Kruger MOLDREF99 1: :  zone 1: –  zone 1: –  zone 1: 500 – 1: Vertical reference system: Baltic Sea 1977

Geodetic Infrastructure in Moldova The National Geodetic Network EUREF sites (5) second-order sites (400) first-order sites (78) OTACI UNGHENI CHELTUITORUL NOU PALANCA GIURGIULESTI GPS measurements

Geodetic Infrastructure in Moldova The National Leveling Network L E G E N D 1-st order leveling 2-nd order leveling Reconstruction and integration in ULEN 1st polygon (350 km) closed in nd polygon (429 km) performed 202 km in rd polygon (116 km) performed 30 km in th polygon (267 km) to be performed in

Geodetic Infrastructure in Moldova The National Gravity Network 3 absolute gravity stations (2006) with RMS < 5  Gal 17 first order gravity stations (2006) with RMS < 10  Gal 112 second order gravity stations ( ) with RMS < 20  Gal 271 third order gravity network performed ( ) with RMS < 40  Gal 1511 third order gravity network to be performed ( ) Total: 2012 gravity stations (4x4 km) Absolute gravity sites 1 st order gravity sites 2 nd order gravity sites 3 rd order gravity sites Legend: BRICENI CHISINAU GIURGIULESTI

GNSS “passive” network ( ) 0 order (EUREF) 2 nd order (400 staţions) 1 st order (78 stations) GNSS “active” network ( ) IGEO OTACI UNGHENI CHELTUITORUL NOU PALANCA GIURGIULESTI 0 order (5 EUREF stations) 2 nd order (400 staţions) 1 st order (78 stations) Legend MOLDPOS/RTK GNSS permanent stations ROMPOS/RTK GNSS permanent stations MOLDPOS/GEO and ROMPOS/GEO GNSS permanent stations Legend GNSS Permanent Network Concept GNSS Network design

CORS stations MOLDPOS architecture Control Center GPS NAVSTAR/ GLONASS GALILEO MOLDPOS Server Data Server Distribution Post processing data FTP/WWW server Real time applications GSM router Raw data Corrections Distribution of real-time data streams through Internet using NTRIP (Network Transport of RTCM by Internet Protocol) format. Geodetic Data base GNSS Permanent Network Concept

MOLDPOS functionality MOLDPOS server RTCM server GSM-modem GNSS-receiver VRS, FKP, MAC MOLDPOS data RTCM NMEA Position message RTCM ROVER Geodetic data base (transformations parameters, map projections, quasigeoid model, etc) GNSS Permanent Network Concept

Integration with EPN IGEO Starting from August 2007 the Agency of Land Relations and Cadastre in collaboration with BKG installed and jointly operate a GNSS permanent tracking station IGEO (Chisinau) integrated into EPN and will be integrated in MOLDPOS GNSS Permanent Network Concept

Densification with the ~ 70 km spacing requires that at least 13 permanent operating GNSS stations to be installed in order to provide the differential GNSS for navigation and real time kinematics for surveying The Geodetic Data Base to be created for MOLDPOS service to generate and distribute differential corrections, transformation parameters and height anomalies from the national quasigeoid model MOLDPOS will be used by a large spectrum of users (geodetic works, cadastral surveying, GIS applications, mapping and boundary marking, etc.) MOLDPOS will be the basis of support of scientific applications (landslide and floods monitoring, environmental research, geohazard prediction, meteorology, etc.) Conclusions GNSS Permanent Network Concept

Thanks for attention Contact: As. Prof. Dr. Vasile Chiriac Department of Geodesy, Cadastre and Geotechnics Technical University of Moldova 168, Stefan Cel Mare street MD 2005 Chisinau Tel: Fax: Mob: URL: Technical University of Moldova Agency for Land Relations and Cadastre (ARLC)