LAND CADASTREToday and Challanges for the future

Damjan DOLER

Head of Real Estate DepartmentRegional surveying office Celje

Mariborska cesta 88, Celje, SLOVENIA

32nd Conference of Surveyin Authorities, 20-22 Mai, 2015

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

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)

2. Land cadastre in Slovenia

1818 – 1829: Franciscean cadastre - first cadastral survey(Cadastral plans 1:2880; Land use, land classification and ownership were defined)

1869 – 1882: Reambulation - new systematic cadastral survey (only some areas)

1871: Land register - dual property registration system

1945 – 1991: - 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

1811 – 1813: Napoleon Cadastre

1991 (Slovenia) - :- digitalization - land Information system- Building cadastre (2000 - )

Challenges in the future: Improvement of positional accuracy, Central base of the real estate, new reference coordinate system D96/TM, new models – 3D cadastre?

CBN (central base of the real estate)

•multipurpose cadastre

•graphical subsystem in new coordinate system (TM/96)

•…

Challenges•Improvement of positional and geometrical accuracy of the land cadastral data

•Transformation between the old and new national coordinate system

3. From fiscal to multipurpose cadastre

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

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: 23.11.2017

CBN: december 2015

CBN (central base of real estate)

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

Extended networkSource: Berk, Komadina, 2010

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

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

6. Challenges

Challenges - the positional (in)accuracy

Challenges due to unsuitable land plot structure

Land consolidation with resettlement? Are we ready?

Vir/ Source: Joc Triglav, 2014

From land and building cadastre to 3D cadastre?

THANK YOU FOR YOUR ATTENTION !