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of the location database of the Land Cadastre for the whole
of Slovenia. The captured data was administered in reference
to individual parts of cadastral units. Namely, data of the
coordinate cadastre was administered in the national
coordinate system, while data of the graphical cadastre was
administered in local coordinate systems. Land parcel
boundaries between neighbouring parts of cadastral units
were not matching.
Procedures were defined for the transformation of parts of
cadastral units into the national coordinate system. The
procedures are based on the Helmert transformation of the
homogenous unit — part of the cadastral unit on the basis of
identified and verified transformation points.
The step that followed included the definition of procedures
for the matching of boundaries of individual parts of
cadastral units. In this step the boundaries of the first are
matched to the boundaries of the second part of the cadastral
units in compliance with the quality of data on individual
cadastral units and in compliance with the matching proposed
by individual Branch Offices of the Surveying and Mapping
Authority of the Republic of Slovenia. The transformation
and matching of cadastral unit boundaries started in 1998.
These tasks were implemented by surveying and mapping
companies, while intermediate controls and confirmation of
continuation of activities were in the competence of the
Brach Offices of the Surveying and Mapping Authority of
the Republic of Slovenia.
By the end of 1990's, approximately 2/3 of all graphical data
of the Land Cadastre was processed in accordance with the
described procedure including scanning, vectorization, edge-
matching, transformation and matching of boundaries of
digitised cadastral units. In order to meet the requirements of
a fast coverage of the whole of Slovenia with digital
graphical data of the Land Cadastre, the Republic of Slovenia
obtained a loan from the International Bank for
Reconstruction and Development in 2000. The loan
proceedings were used to process all the data of the graphical
part of the Land Cadastre in accordance with the procedure
described above. The assignment was completed at the end of
2002.
Also, software was developed that enables the administration
and updating of the location database. The package allows
the browsing of the location database of the Land Cadastre
(land parcels, Land Cadastre points), preparation of data for
the implementation of field surveys, receipt of field survey
data, its control and integration into the database, and the
recording of history of changes. This software is used at all
Branch Offices of the Surveying and Mapping Authority of
the Republic of Slovenia.
Another software package was developed for companies
providing surveying and mapping services. The software
enables the receipt of digital location and attribute data
issued by the Surveying and Mapping Authority of the
Republic of Slovenia, entry of data and computations, edge-
matching using graphical data or coordinates, and
preparation of all exchange files required for the updating of
the location and attribute databases of the Land Cadastre at
Branch Offices of the Surveying and Mapping Authority of
the Republic of Slovenia.
Both software solutions have been developed so as to take
into account the specific features of the updating of the
119
graphical and coordinate cadastre. Nevertheless, they form a
single solution for administering and updating the location
database of the Land Cadastre.
Central Database of the Land Cadastre
The central database of the Land Cadastre consists of
attribute and location data of the Land Cadastre for the whole
of Slovenia. The data is administered in a uniform format and
is updated on a regular basis.
The central database of attribute data of the Land Cadastre
was set up in 1995. In the initial stages the database was
updated once or twice a year.
Since 1999 the Surveying and Mapping Authority of the
Republic of Slovenia has been administering a new Central
Database of the Land Cadastre (for attribute data). The
database is based on modern IT solutions and is updated on a
daily basis with data from local databases administered by
the Branch Offices of the Surveying and Mapping Authority
of the Republic of Slovenia. The updating procedure using
the local databases has been designed so as to allow a
random number of updates (even several times a day) and the
triggering of the updating from the Central Database
independently of Branch Offices.
The Central Database is used for issuing data to all major
users (municipalities, other government bodies, civil
engineering companies, etc.). Data on legal regimes has also
been appended to the Central Databases for testing purposes.
The database has been replicated at the Government Centre
for Informatics of the Republic of Slovenia. A browser has
also been developed. It allows other government bodies to
retrieve information from the database.
The development of the Central Database of the Graphical
Part of the Land Cadastre started much later, which is
understandable due to the fact that there was no adequate
digital data available. At first a Central Database of Location
Data of the Land Cadastre was created at the Geoinformation
Centre of the Republic of Slovenia, but which was not used
in real life situations due to the lack of organizational linkage
with the source of updating. Therefore, in 1998 the Main
Office of the Surveying and Mapping Authority of the
Republic of Slovenia set up a Central Database of Location
Data of the Land Cadastre. Apart from storing data, this
Central Database also allows browsing and exporting of data
as well as batch updating by individual parts of cadastral
units that are prepared by the Branch Offices of the
Surveying and Mapping Authority of the Republic of
Slovenia. Currently, selected Branch Offices implement the
updating of location data of the Land Cadastre with data
deriving from administrative procedures completed at the
Branch Offices. At the same time the Central Database is
also updated on a daily basis with the database of Land
Cadastre points, record of cadastral studies and land parcels
that are subject to administrative procedures.
All companies specializing in surveying and mapping are
gradually being allowed to use the data administered in the
Central Database of the location and attribute part of the
Land Cadastre. A prototype Internet application has been
developed for this purpose. It will allow the browsing of all
Land Cadastre data and the preparation of data for the
implementation of changes based on surveys implemented by
the providers of surveying and mapping services.