LAND CADASTRE Today and Challanges for the future Damjan DOLER

Transcription

1 LAND CADASTRE Today and Challanges for the future Damjan DOLER Head of Real Estate Department Regional surveying office Celje Mariborska cesta 88, Celje, SLOVENIA 32nd Conference of Surveyin Authorities, Mai, 2015

2 1. Legal framework 2. Land cadastre in Slovenia (historical overview) 3. From fiscal to multipurpose cadastre 4. Land cadastral data (problem of data quality) 5. TRANSFORMATION to the new coordinate system of Slovenija (D96/TM) 6. Challenges

3 1. Legal framework The Surveying and Mapping Authority - SMA (Ministry of the Environment and Spatial Planning) is responsible for the spatial data infrastructure including: - the spatial reference system, - topographical data and - real estate (land related) data (Land cadastre, Building Cadastre, Land Registry) LEGISLATION: Land survey service act (2010) organisational regulation Act on the infrastructure for spatial information Act (2010) Act on geodetic reference system (2014) Land Cadaster Act or Real Estate Recording Act (2006) Real Property Mass-Appraisal Act (2006) Act on designating areas and naming and marking settlements, streets and buildings(2008)

4 : Napoleon Cadastre 2. Land cadastre in Slovenia : Franciscean cadastre - first cadastral survey (Cadastral plans 1:2880; Land use, land classification and ownership were defined) : Reambulation - new systematic cadastral survey (only some areas) 1871: Land register - dual property registration system : - new reference coordinate system D48/GK - the maintenance of the land registration system (land cadastre) was not important - new cadastral survey of some small urban areas - land consolidations 1991 (Slovenia) - : - digitalization - land Information system - Building cadastre ( ) Challenges in the future: Improvement of positional accuracy, Central base of the real estate, new reference coordinate system D96/TM, new models 3D cadastre?

5 CBN (central base of the real estate) multipurpose cadastre graphical subsystem in new coordinate system (TM/96) 3. From fiscal to multipurpose cadastre Challenges Improvement of positional and geometrical accuracy of the land cadastral data Transformation between the old and new national coordinate system

6 4. Land cadastral data (problem of data quality) DATA SETS HAVE BEEN DEVELOPED OVER LONG PERIOD/PROBLEM OF DATA QUALITY! - different methods of data acquisition - different methods of data maintenance - a dynamic system -... PROBLEMS (graphical subsystem): -(in)completeness of the conceptual model -(in)completeness of attributes -logical (in)consistency -positional (in)accuracy -temporal (in)accuracy -thematic and attributes (in)accuracy Source: Geodetic Institute of Slovenia, 2003

7 5. TRANSFORMATION to new coordinate system of Slovenija (D96/TM) The Act on geodetic reference system (2014) provides transformation of all spatial database into the new coordinate system D48/GK (old) D96/TM (new) Land cadastre: CBN: december 2015 CBN (central base of real estate)

8 TRANSFORMATION MODEL Triangle-based piecewise affine transformation The basis for transformation is a set of about 2000 actually measured points Virtuale tie points are used, which form a regular triangular network - base network: 594 tie points - extended network: 899 tie points Homogenization (membrane method) In areas where using a triangle-based piecewise affine transformation does not achieve satisfactory results, one of the possible aproaches is to improve the positional accuracy of graphical cadastre based on membrane method. Base network Source: Berk, Komadina, 2010 Extended network

9 Pilot project 2014 To test Triangle-based piecewise affine transformation and membrane method 10 test areas (cadastral community) Only cadastral points are included RESULTS (Standard deviations of coordinates) Source: Geodetic Institute of Slovenia, 2014

10 Pilot project 2015 To test Triangle-based piecewise affine transformation and membrane method 70 test areas Cadastral and geodetic points are included Source: Geodetic Institute of Slovenia, 2014

11 6. Challenges

12 Challenges - the positional (in)accuracy

13 Challenges due to unsuitable land plot structure Land consolidation with resettlement? Are we ready? Vir/ Source: Joc Triglav, 2014

14 From land and building cadastre to 3D cadastre?

15 THANK YOU FOR YOUR ATTENTION!