Reference Systems Realization for the Territory of Bulgaria - Status and Perspectives

Transcription

1 Conference and plenary meeting of the Permanent Committee on Cadastre in the European Union March 2018, Sofia Reference Systems Realization for the Territory of Bulgaria - Status and Perspectives Slaveyko Gospodinov, Elena Peneva, Yuri Tzanovski, Tatyana Lambeva Hr.Smirnenski Blvd 1, Sofia 1046, BULGARIA

2 Content 1. International organizations, subordination, and their relationship with national structures 2. EUREF mission and systems 3. Bulgarian Geodetic System - legal basis, national institutions 4. State GPS Network 5. National Levelling Network 6. National Gravimetric Network 7. Conclusion problems and perspectives

3 1. International organizations, subordination, and their relationship with national structures International Union of Geodesy and Geophysics (IUGG) Non-governmental, scientific organization, established in 1919 Michael SIDERIS, Bureau of the Union Officers President International Association of Geodesy (IAG) Established 1862, Geodesy Section of the IUGG after General Assembly of IUGG (Rome, 2-10 May 1922) IAG, Commission 1: Reference Frame General Assembly of IUGG (Rome, 2-10 May 1922) Sub-Commission 1.3: Regional Reference Frames Founded in 1987 at the IUGG General Assembly held in Vancouver Hermann DREWES, IAG Secretary General President: Geoff Blewitt, University of Nevada, Reno, USA Chair: Carine Bruyninx (Belgium) In activity since General Assembly held in Sapporo, 2003 Sub-Commission 1.3a: Europe (EUREF) Chair: Markku Poutanen (Finland)

4 2. EUREF mission and systems EUREF: Reference Frame Sub-Commission of Europe Primary mission: To establish and maintain the European coordinate reference system and physical height reference system The adopted systems are: 1) ETRS89 ( European Terrestrial Reference System) adopted in 1990 in Firenze, Italy by EUREF Resolution 1 and 2) EVRS (European Vertical Reference System) Technical Working Group of the EUREF recommended EVRS in Marne-la- Valleé, France in November 1999; principles of the realization of the EVRS were adopted at the EUREF Symposium 2000 in Tromsø, Norvey by the Resolution no. 5. These systems are the basis for geo-referencing in Europe, and have been endorsed by the European Union INSPIRE 10 directive, Eurocontrol and EuroGeographics

5 3. Bulgarian Geodetic System and EUREF EUREF: European coordinate reference system and physical height reference system Law on Geodesy and Cartography, 7 Apr 2006 Art. 12. (1): The law on Geodesy and Cartography shall create conditions for:...introduction of international and European standards in the geodetic and cartographic activities in the country. Basic geodetic activities include: 1. the determining and the updating of the geodetic system 2. the maintaining of state geodetic network, geodetic networks of local designation and state levelling network 3. the maintaining of state gravimetric network and networks of sea level and magnet stations Art. 12. (1): The geodetic system for the territory of the Republic of Bulgaria called hereinafter "Bulgarian geodetic system" shall be determined on the basis of the European geodetic reference system. The Bulgarian geodetic system shall include: 1. Fundamental geodetic parameters; 2. Geodetic coordinate system; 3. Height system; 4. System of plain coordinates based on the adopted geodetic coordinate system and cartographic projection which is used for civil application; 5. System of division and nomenclature of the map sheets.

6 3. Bulgarian Geodetic System legal basis Bulgarian Geodetic System BGS 2005 Established with: Decree 153 of on the introduction of Bulgarian Geodetic System 2005, Council of Ministers of the Republic of Bulgaria Regulations: Ordinance 2 of for the Definition, Realization and Maintenance of the Bulgarian Geodetic System 2005, Ministry of Regional Development and Public Works and Ministry of Defense / Law on Geodesy and Cartography, 2006 Instruction RD of to determine geodetic points using global navigation satellite systems, Ministry of Regional Development and Public Works Instruction RD of For transformation of the existing data and materials into BGS 2005, Ministry of Regional Development and Public Works

7 3. BGS objectives and requirements The Bulgarian Geodetic System 2005 (BGS 2005) is determined on the basis of the European Geodetic Reference System [Art. 2. (1), Ordinance 2 /2010] Implementation of geodetic standards in line with the resolutions of IAG Sub-Commission 1.3a: Europe (EUREF) and Ensuring compatibility of the geodetic base of spatial data within the European Union [Art. 2. (2), Instruction RD /2012] Is harmonized with the standards, activities and products of the European Reference System (EUREF) and ensures homogeneity and compatibility of geoinformation within the European Union [Art. 8., Instruction RD /2012]

8 3. BGS 2005 contributes to Art. 2. (1), Instruction RD /2012: Introduction of permanent GNSS station near Sofia in the composition of the permanent EUREF network (EPN), and later on the IGS World Network Building a State GPS Network, related to EPN Connecting of State Leveling Network with the European Vertical Reference Network (EUVN) Inclusion of the country in the activities for determination of the European geoid

9 3. Bulgarian Geodetic System - responsible institutions Law on Geodesy and Cartography, 7 Apr 2006: The definition, realisation and maintenance of the BGS shall be determined with ordinance of the Minister of Regional Development and Public Works and the Minister of Defence Minister of Regional Development And Public Works - Manage the state policy in the field of geodesy and cartography - Ensure the harmonizing of the legislation of the Republic of Bulgaria with the legislation of the European Union in the field of geodetic and cartographic activities - Implement the methodical management of the geodetic and cartographic activities Minister of Defence Ensure 1. the maintenance of the state geodetic network; 2. the maintaining of the basic gravimetric network and the determining of the magnet declination for the territory of the country Agency for geodesy, cartography and cadastre (AGCC) Ensure (1) maintenance of the National Levelling Network and the network of sea level stations (2) implement control over the quality of the results of the geodetic and cartographic activities except these implemented by Ministry of Defence

10 3. Bulgarian Geodetic System - responsible scientific and educational institutions Law on Geodesy and Cartography, 7 Apr 2006: The AGCC, Ministry of Defence, Ministry of Interior, Scientific organisations and Higher schools prepare proposals for determining and updating of the Bulgarian geodetic system. University of Architecture, Civil Engineering and Geodesy (UACEG) and National Institute of Geophysics, Geodesy and Geography of the Bulgarian Academy of Sciences (NIGGG-BAS) performs the scientific assurance, final processing and analysis of the NLN [Ordinance RD от for State Levelling Network, Ministry of Regional Development and Public Works] carry out scientific and applied insurance of gravimetric measurements and their processing [Ordinance No H-9 of for the State Gravimetric Network, Ministry of Defense]

11 3. Bulgarian Geodetic System - Bulgarian Geodetic Reference Frames in BGS2005 European Geodetic Reference Systems Compound Coordinate Reference System (CRS)/ EUREF ETRS89 Realization EPN EVRS Realization EVRF2007, UELN 95/98 ECGN/GGOS Key components of the Bulgarian Geodetic System 2005 which define reference systems realizations Coordinate system 2005 Determined to epоch from ETRS89 Realized through the State GPS Network points and Permanent GNSS stations, connected to EPN Vertical system 2005 Realized through the First order points of State Levelling Network and points from EUVN-DA, connected to EVRF2007 Using gravimetric data in IGSN71 Fundamental geodetic parameters of GRS80

12 4. State GPS Network The European Terrestrial Reference System 89 (ETRS89) was adopted as an official geodetic reference system in the European Union. ETRS89 Realization: EPN European Permanent Network The EPN network is operated under the umbrella of the IAG Regional Reference Frame sub-commission for Europe, EUREF and consists by 317 stations. Permanent station - SOFI00BGR, providing GPS and GLONASS observations. Part from EPN and IGS since 1997.

13 4. State GPS Network Connections of State GPS Network to EPN 1992: 7 pts of first GPS Network BULREF part from EUREF 1997: Via 14 passive pts + 1 permanent point (SOFI) for realization BGS : Via main order and second order points 473 pts for realization BGS 2005 BGS2005 coordinate system = ETRS89/ETRF 2000, epoch Realization: State GPS Network: = Passive network + 1 permanent station (SOFI) Main order: 128 pts, average distance between pts 35 km, position accuracy 5 mm ; height accuracy mm Second order: 345 pts, average distance between pts 7 km, position accuracy 5-10 mm ; height accuracy mm

14 4. State GPS Network present status and remarks Determined velocities of the EUREF points from period (points from First BULREF and BGS 2000 realization) on the territory of Bulgaria are about 3 mm/year Consequently: Coordinates in BGS2005 are practically applicable over a 10-year period It is necessary to monitor the State GPS Network points and to take into account actual velocities Present status (2017) of State GPS network, activities: 21 new build pts + 1 repaired Part of the main order points are re-measured and are calculated velocities Results for velocities are not officially published Until this moment BGS 2005 have not velocities It is not fulfilled condition for realization of the Coordinate Reference System: BGS 2005 Having a CORS for realization of the BGS2005 coordinate system would solve the problem of lack of velocities

15 5. National Levelling Network - structure National Levelling Network Ist order National Levelling Network Levelling loops with approximate perimeter of 400 km Average length of the levelling lines 80 km Nodal bencmarks 33 pts IInd order National Levelling Network Levelling loops with approximate perimeter of 100 km Average length of the levelling lines 35 km IIIrd order National Levelling Network Average length of the levelling lines 25 km IVth order National Levelling Network Vertical network for the territory of Bulgaria ->>> National Levelling Network

16 5. National Levelling Network- realizations National Levelling Network REALIZATIONS National Levelling Network - Ist epoch Period Black Sea Height System Orthometric heights National Levelling Network - IInd epoch Period ; Baltic Height System - Datum identifier Kronstadt UPLN 1952 Normal heights - gravity related Potsdam/IGSN71 National Levelling Network - IIIrd epoch Period г.; г. Baltic Height System till 2010 / EVRS from 2010 Normal heights / Geopotential numbers - gravity related IGSN71 National Levelling Network - IVth epoch Period from 1995 not finished and not introduced EVRS /Normal heights / Geopotential numbers

17 5. National Levelling Network- EVRS/EVRF2007 Bulgarian National Levelling Network (Ist and IInd of National Levelling Network - IIIrd epoch 1984, measured ) became a part of UELN-95/98 In 2003 The measurements of National Levelling Network - IIIrd epoch 1984 are used The connection is realized by 5 bencmarks at the Romanian border BG _ KRON a a M - a N - cos H( EVRF 2007) H Levelling lines in EVRF2007 and reference points Elevation differences of the nodal benchmarks between UELN (EVRF2000) and Baltic system in cm

18 5. National Levelling Network status and remarks Legislation base: Ordinance RD / for the National Levelling Network, Ministry of Regional Development and Public Works and Ministry of Defense Instruction for Ist and IInd class levelling, Issued in 1980 by the Committee on Architecture and Urban Development, Head of Geodesy, Cartography and Cadastre Remarks: Works for IVth epoch of National Levelling Network should be terminated Measurements are since 1995 and are not finished yet - inconsistent measurements - 23 years period of measurements => it is impossible to determine correctly contemporary vertical movements of the earth's crust (some of them are 3-4 mm/year) Initial measurements for IVth epoch are carried out by old Ordinance new one is from 2015 The Instruction for Ist and IInd class Levelling, Issued in 1980, is outdated its not in line with the adopted Ordinance RD / does not agree with the requirements for digital levels its not in line with the new resolutions of the IAG

19 6. National Gravimetric Network Legislation base: Ordinance No H-9 of for the State Gravimetric Network, Ministry of Defense Instruction for gravimetric measurements, Issued in 1965 by the Committee on Architecture and Urban Development, Head of Geodesy, Cartography and Cadastre Reference Gravimetric Network 100 points average distance between points 50 km; Density: 1 pt/1100 km 2 Gravimetric Reference System: IGSN71 Absolute points on project UNIGRACE 1998 and 2005

20 6. National Gravimetric Network status and remarks Current Instruction for gravimetric measurements from 1965 is outdated and can not serve as a legal basis for the maintenance of the National Gravimetric Network. Gravimetric measurements and data on the territory of Bulgaria does not meet the contemporary requirements for accuracy and reliability of the fundamental gravimetric networks. At the moment is used Reference Gravimetric Network. There is no legal base regulations for implementation and applying. Gravimetric measurements, data and network are not in line with the new IAG Resolutions. Gravimetric reference system according to legal basis is IGSN71, which does not fulfill accuracy requirements of IAG. Contemporary accuracy requirements for IHRS points in order to achieve 2 cm accuracy geoid need 80 microgal accuracy of gravity data.

21 7. Conclusion problems and perspectives State GPS Network PROBLEM: The implementation of BGS 2005 needs to be presented not only through precisely determinate coordinates but with precisely determinate coordinates combined with proven velocities. DECISION: Considering the passive nature оf State GPS Network possible decision is to determine velocities from commercial networks (CORS) and to interpolate them for the points of State GPS Network. Commercial networks (CORS) are certificated for 2 years period. Real velocities could be determined in 10-years period for re-measurement of State GPS Network and could controlled the interpolated ones.

22 7. Conclusion problems and perspectives State Levelling and Gravimetric Networks Need of new Instructions for Ist and IInd class levelling and gravity measurements in accordance of new requirements and resolutions of IAG Need of metrological provision for instruments and tools proper calibration base Cross-border connections of levelling and gravimetric networks with neighbourhood countries Establishment of new gravimetric network - radical renovation of current Reference Gravimetric Network Initiation of measurements on new IV th epoch of National Levelling Network which should be completed in maximum of 5 years period

23 It is necessary to bring together the efforts of the leading specialists and scientific researchers in the field of geodesy and in the practice under the leadership of AGCC, as the official state body. Quality cadastral and spatial data for end-users can not be achieved without contemporary basic geodetic reference networks in accordance with European standards and regulations. Thank you for attention!