1. Usage of Cadastre and Address Register Data for production of Geospatial Reference Data Conference Dedicated to the 20th Anniversary of the State Land Service of Latvia „Challenge of Cadastre in the Digital Era” May 8, 2013. Arvīds Ozols Latvian Geospatial Information Agency Geoinformation and IT Department arvids.ozols@lgia.gov.lv arvids.ozols@lgia.gov.lv

2. About LGIA The State agency “Latvian Geospatial Information Agency” is leading authority in the implementation of the national policy in the field of geodesy, cartography and geospatial information. (Geospatial Information Law, Section 4, Paragraph 2) LGIA is the Governmental Authority under supervision of the Minister of Defence because the MoD carries out and coordinates implementation of the national policy in the field of geodesy, cartography and geospatial information The Agency works in compliance with the Regulations of the Cabinet of Ministers of the Republic of Latvia No. 1132 from December 21, 2010 "Regulations of the State Agency "Latvian Geospatial Information Agency"

3. The Main Functions of LGIA To acquire, process and maintain geospatial reference data for military and civil purposes and to implement other tasks that are established in the Geospatial Information Law To create and develop the information system of the geospatial reference data To cooperate with state and municipal institutions, member states of the North Atlantic Treaty Organization, the European Union institutions and international organizations acting in the area of competence of LGIA and to provide them with geodetic, cartographic and geospatial information

4. LGIA Tasks According to Geospatial Information Law (1) The State agency “Latvian Geospatial Information Agency” acquired, prepare and update the following reference data and shall be the holder thereof (GIL Section 17, Paragraph 3): –images of the surface, data of remote sensing and orthophotos of the Earth within the framework of the scale line 1:50 000 – 1:2000; –digital models of area and surface, which are used for drawing up of topographic plans and topographic maps within the framework of the scale line 1:250 000 – 1:500; –geospatial information, which is included in topographic plans and topographic maps within the framework of the scale line 1:250 000 - 1:2000; –the reference data of geospatial information in order to provide support for the fulfilment of the tasks of the National Armed Forces and the participation thereof in the North Atlantic Treaty Organization in accordance with the procedures specified by the Ministry of Defence.

5. LGIA Tasks According to Geospatial Information Law (2) Information regarding place names, which is necessary for the performance of geodetic and cartographic activities, shall be compiled in the Data Base of Place Names. The State agency “Latvian Geospatial Information Agency” shall be the holder of the Data Base of Place Names and the manager of the national information system of place names. (GIL Section 18, Paragraph 2)

6. External Sources of Information (from SLS) for Geospatial Data Preparation The most important information from SLS used for preparing LGIA geospatial reference data is as follows: -data of the State Address Register; -cadastre map; -boundaries of administrative territories; -topographic information of high detailed elaboration at scale 1:500. Geospatial reference data sets of LGIA for preparation of which SLS data is used: -topographic plans at scales 1:2000 un 1:5000; -topographic maps at scale 1:10000; -the Database of Place Names; -orthophoto maps; -the National Geodetic Network and the Local Geodetic Network databases.

7. Topographic Plans at Scales 1:2000 and 1:5000 (1) Used data sets from SLS: –data of the State Address Register - addresses and street names; –cadastre map - used as additional source for information on buildings; –topographic information of high detailed elaboration at scale 1:500 - characteristics of buildings, address data, data on streets, roads, squares, tracks and other data. All the data included in plans at scale 1:2000 and 1:5000 is checked in the field.

8. Topographic Plans at Scales 1:2000 and 1:5000 (2)

9. Topographic Map at Scale 1:10 000 (1) Used data sets from SLS: –data of State Address Register – data on streets, farmsteads and villages, as well as road indexes; –cadaster map - used as additional source for information on buildings; –topographic information of high detailed elaboration at scale 1:500 – used for data on transformator substations, different kind of towers, water supply objects and various buildings; –boundaries of administrative territories – solely for map printouts and printed matters. All the included data is checked in the field. Topographic map at scale 1:10 000 serves as the main source for smaller scale topographic maps.

10. Topographic Map at Scale 1:10 000 (2)

11. The Database of Place Names (1) Legal basis: –Law On Administrative Territories and Populated Areas; –Geospatial Information Law; –Official Language Law; –The Regulations of the Cabinet of Ministers of the Republic of Latvia No. 50 from January 10, 2012 «Regulations of the place names information»

12. The Data Base of Place Names (2) Used data sets from SLS: –data of State Address Register the State Address Register data is replicated to LGIS information system every night; as soon as the procedure of replication is finalized, amendments to the Place Name Data Base takes place. Such a procedure remarkably makes easier the process of up-to- dating place names and aligning with decisions by municipalities. Coordinates of addresses have a significant role in order to ensure accurate georeferencing. - boundaries of administrative territories - b elonging of a place name to an administrative territory is registered in the Place Names Database.

13. The Database of Place Names (3)

14. Orthophoto Maps Used data sets from SLS: –Topographic information of high detailed elaboration at scale 1:500. For aerotriangulation, valid control points with known x,y,z coordinates are used. For checking the quality of orthophotomaps, accurate disposition of various objects is verified.

15. Maintenance of Geodetic Network (1) Protection of the Geodetic Network (GIL Section 14): –the national geodetic network fixed in an area shall be the State property and shall be under the State protection. –the local geodetic network fixed in an area shall be the property of a local government and shall be under the protection of the local government. –the national geodetic network and a local geodetic network fixed in an area shall be specified protection zones in accordance with the Protection Zone Law. Used data sets from SLS: –cadastre map - obtaining authorisation for geodetic works from real estate owners or landlords: fixing new markers of the State Geodetic Network, maintenance works; –boundaries of administrative territories – by entering coordinates of a geodetic point in the Geodetic Network Database, administrative territorial belonging of the point is verified. Aligning of geodetic points with administrative units improves the usability of the database.

16. Maintenance of Geodetic Network (2)

17. Demarcations of State Borders For demarcation, all the accessible geospatial reference data sets from holders are used. Used data sets from SLS: –data of State Address Register; –cadastre map; –boundaries of administrative territories. In early stage of collecting and arranging place names, there was lack of information on place names and names of farmsteads in both Place Names Database and State Address Register. The data had to be collected from different sources including municipalities. In order to make more accurate boundaries of administrative territories, SLS has access to the state border data surveyed by LGIA.

18. SLS Data in LGIA Map Browsers The internal map browser is used for the following purposes: –as an additional tool for various mapping works; –creating and analasys of various data layers; –data searching. SLS data in the internal map browsers: –administrative boundaries; –State Address Register (address points, street and road lines); –cadastre map with cadastre maps; –data search is available in all the above mentioned SLS data sets. The public LGIA map browser provides only administrative boundaries.

19. SLS Data in LGIA Map Browsers

20. Regulations to Determine Data Submitting to SLS by LGIA Law on Information System of Encumbered Territories, Section 8, determines that LGIA should submit to SLS information on the following objects: –geodetic points, –terrestrial water objects, –swamps. National Real Estate Cadastre Law, Section 17: –The following basic information shall be used for the specification of objects of real estate or parts of units of land: –data of the State geodesy networks; –orthophotographs and topographic maps and plans;

21. Regulations to Determine Data Submitting to SLS by LGIA Regulations of the Cabinet of Ministers of the Republic of Latvia No. 47 from January 10, 2012 «Regulations on Procedure and Submitting of Necessary Information and its Amount to Maintain the Real Estate State Cadaster Information System»: Paragraph 12. The State agency “Latvian Geospatial Information Agency” shall submit the following geospatial reference data in the geodetic co- ordinate system of Latvia (1992) which is expressed as coordinates of Mercator Transverse projection (LKS-92 TM) digitally: 12.1. state geodetic network data that have not been accessible by public in the State Geodetic Network Database upon a written request by the State Land Service; 12.2. orthophoto maps at scale 1:10 000 and 1:2 000; 12.3. topographic maps at scale 1:50 000, 1:10 000 and 1:2 000; 12.4. state border geospatial reference in vector format.

22. Conclusion SLS data is a significant source of information to ensure the process of production of geospatial reference data by LGIA. Both institutions work on projects financed by the European Regional Development Fund in order to establish an up-to-date geospatial data infrastructure that will improve and maintain the interoperability of geospatial data and interchange of information between institutions.

23. Thank you for attention! More information about LGIA www.lgia.gov.lv,www.lgia.gov.lv On products and services – http://map.lgia.gov.lv,http://map.lgia.gov.lv Arvīds Ozols Latvian Geospatial Information Agency Geoinformation and IT Department arvids.ozols@lgia.gov.lvarvids.ozols@lgia.gov.lv, phone: +371 29233519