GEOINFORMATION
NFRASTRUCTURE
BASES
TAILED
DATA BA
C T O RI
Decisions about such complex matters need to be based
upon up to date and reliable information that is freely
accessible, standardised and interchangeable.
In the last decades spectacular advances in electronics
and computer technology have resulted in the information
revolution and led to the establishment of Geographic
Information Systems (GISs), that may combine all kinds
of spatial information to social-economical and other type
of information. Nowadays this has become an important
tool for regional planning and land management.
Aware of this, the Ministry of Environmental Protection
and Regional Planning (MEPRP) and the Geodetic Autho
rity initiated the project:Computerization of the geodetic
evidences". The feasibility study for this project was in
ternationally tendered because of the urgent need to
modernise the geo-oriented data bases for natural re
source management and the protection of private proper
ty. This feasibility study clarified a number of problems
related to the redefinition of the geodetic activities:
necessity of the development of a geo-information
infrastructure;
technology transfer;
organization of the geodetic services;
geodetic education and research and development;
entire geodetic legislation;
development of new cost models;
etc.
Photogrammetry appeared to become the major method
for data collection. This article intends to concentrate on
the practical experiences gained in the project and
emphasises on the main obstacles in modernising the
geodetic services in post socialistic societies.
with the production of topographical map series at scales
1 5 000, 1 25 000, 1 400 000 and 1 750 000, elabo
ration of basic network of geodetic points and elaboration
and maintenance of land cadastre. The production and
maintenance of the topographical map series was based
on the cyclic aerial survey in scale 1:17 500 which was
processed with analogue photogrammetric stereoplotters
resulting in analogue paper based maps. The production
of the maps was not standardised except for the graphical
part.
The land cadastre is of Austrian/Hungarian type, 150
years old and not geo-oriented. New surveys are elabo
rated by analogue photogrammetric stereoplotters and
partially automated, terrain surveys. All tabular data are
automated and centrally stored in sequential data bases.
Concept of the geo-information infrastructure
The basic concept of the geo-information infrastructure in
the Republic of Slovenia separates the existing geodetic
evidences in two parts according to their functions.
land register
cadastre
of buildings
land
cadastre
Fig. 4. The mutual relations between the land and buildings
cadastre and the land register.
Definition of the geo-information infrastructure
Present status
As in most countries in the world also the geodetic ser
vices in the Republic of Slovenia were mainly occupied
Fig. 3. The concept of the Geo-information infrastructure.
NGT GEODESIA 93 - 8
The topographical part is based on the existing 1 5 000
map which covers homogeneously the entire territory of
Slovenia with the highest possible resolution. The topo
graphical data bases are ranked as follows:
digital terrain model (20,000 km2);
hydrographic network (4,000 km);
vegetation coverage (20,000 km2);
utilities and other facilities (30,000 km);
geo-positioning system (80,000 geodetic points);
territorial units (regions, counties, communities, ca
dastral counties, statistical units);
geographical names (200.000).
The topographical data bases contain graphical/tabular
entities with a minimum of attributes enabling to link its
data to data bases with higher resolution of the infor
mation.
Besides pure topographical entities the map in the scale
1 5 000 also serves to capture the graphical/tabular
entities of other sectors of MEPRP for a unique geo-
coding system (see fig. 3):
hydrology/hydrography;
water quality sensors;
geophysics (geologyj/seismology;
ecology/waste material;
etc.
The ownership part of the geo-information infrastructure
consists of a land cadastre and a cadastre of buildings
which are linked to the land registers. Both data bases
have graphical/tabular entities with a minimum of attri
butes and are linked to the topographical data bases
(fig- 4).
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