Germany on the way to a 4D-Cadastre

Transcription

1 Germany on the way to a 4D-Cadastre Dr. Jens Riecken (DVW Vicepresident), Ulrich Gruber, Dr. Markus Seifert (DVW WG Geoinformation) TS 9.1 4D Cadastre, Land Domain Models & Concepts 1 Content About my home place Efforts on 2D level Efforts on 3D level Efforts on 4D level Conclusions April

2 Germany Bavaria km² (=20% of Germany) 12 Mio. inhabitants LVG Bavaria Dr. Klement Aringer 3 Official Cadastre in Germany Responsibility: 16 German States (Länder) independent in surveying matters Structure plus plus 16 Surveying, Mapping and Cadastral Authorities 255 Regional Authorities 1523 Licenced Surveyors (in all German states except Bavaria) Specialists total (Germany) (Bavaria) April

3 Organisation of the Bavarian Surveying Authorities State Ministry of Finance Department of Surveying Bavarian Agency for Surveying and Geographic Information* Cadastre SDI SAPOS Aerial Imagery DTM ATKIS Topographic Maps 51 local Cadastral Offices plus 22 branch offices * will be officially renamed soon in: Bavarian Agency for Digitisation, High Speed Internet and Surveying 5 The Development of the cadastre, the global context April

4 Cadastral History Cadastre always meets specific requirements residential area rural area First cadastral survey of the year Cadastre today: Efforts on 2D Level ALK Automated Real Estate Map + ALB Automated Cadastral Register ALKIS Quite a lot of redundant information Integrated modelling: triple-a Model ATKIS Offical Topographic and Cartographic Information System Geodetic Reference Points AFIS April

5 The evolution of cadastre 3D Cadastre in Germany Cadastral law: Cadastral information should be permanentely improved and developed by considering the requirements of the public users and the possibilities of the technology There is a need for a nation-wide harmonised dataset for the third dimension (building height, DTM) A real 3D cadastre is currently not necessary since there are alternate practical solutions which are properly working The possibilities (benefits) of capturing rights and restrictions on parcels are currently evaluated 9 Discussion A 3D Cadastre really needed? Cadastral registration as spandrel-braced building Rights registration in the land registry April

6 Efforts on 3D Level (buildings) 3D-Models of Buildings as geographic core data in Germany LoD0 LoD1 LoD2 LoD3 LoD4 finished some states (e.g. Bavaria): finished feasibility studies running to be done by private surveyors others: until New in Germany: 3D buildings (exported to GoogleEarth) April

7 Efforts on 4D Level Benefits of the time component in cadastral information systems In the digital age, no other permanent documentation of the development of the cadastre is available Enquiries about the development of a parcel in case of disputes need to look back Monitoring the development of cities and villages over time Statistic of changes of land use and land cover Planning purposes Historical archiving Monitoring of cultural heritage. 13 Efforts on 4D Level OID 4711 Version 1: Surname: Huber Given name: Hilde Version 2: Surname: Meier Given Name: Hilde T1 T2 T today Versioning rules of the data model: major changes of attributes cause the deletion of the object; the deleted object remains in the data base minor changes of attributes cause a new version no structural differences between current and historical data conceptually: object container holding all versions, one ID for one object each version carries ID and life cycle information April

8 Efforts on 4D Level OID 4711 Version 1 Version 2 Version 3 OID 2331 Version 1 OID 223 Version t today - Incremental update information directly out of the data base - Information extraction for ANY time stamp possible (the current date is only a specific case) - Supports data delivery and allows the management of historical information Conclusions Big efforts have been done to evolve the cadastre in Germany to be part of a SDI as a multi-purpose cadastre Modern GIS technology is up and running in cadastral offices There ist a huge demand for 3D data but not (yet) for 3D cadastre information; maybe step-by-step approach by starting with some significant 3D areas The fourth dimension is already implemented for differential updating of user systems; the technology can be used for seamless historical information Short: 2D 3D 4D April

9 For more information see Thank you for your attention! Contact: Dr. Markus Seifert Geschäftsstelle Geodateninfrastruktur Bayern (Secretariat for SDI in Bavaria) Munich, Germany April