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1. The data
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les for the
(i) The Uniform Cadastre provides data for the territory
of the country with its natural resources overgrown
and underground material wealth.
(ii) The data are presented on cadastral maps, photo
mosaics, papers, graphs, alpha-numeric and other
materials.
(iii) The National Center of Cadastre makes and revises
the Uniform Cadastre by organizing, creating and
maintaining a data base, produces orthophotomaps
and other products, provides ministries and other
institutions and companies with space and aerial
photographs, geodetic and cartographic materials,
provides the Territorial Cadastres with inputs,
necessary for making and maintenance of the
Uniform Cadastre.
The requirements of the Law and Rules impose the
provision of respective primary information which can be
in semi-ton, graphic or digital form. The new attitude to
the ownership and the transition to market economy
require a cadastre with legal and technical indicators,
actuality and effectiveness, different from those
established by the presently operating Law.
The cadastre is managed by the Main Department of
Cadastre and Geodesy at the Ministry of Regional
Development and Construction. Some 28 Regional
Offices of Cadastre and Geodesy are established on the
territory of the country which are local bodies of the
Department of Cadastre and Geodesy. The Main
Department, together with its Regional Offices carry out
the state policy, planning, financing, control and approval
of all technical activities on cadastre, geodesy,
photogrammetry and cartography, which are for civil
purposes.
3. GEODETIC, CARTOGRAPHIC AND CADASTRAL
MATERIALS AND DATA
Except for some attempts in the remote past for mapping
the area occupied by present Bulgaria, as well as the
plane-table survey at scale of 1:42 000 made by the
Russian Topographic Corps during and right after the
Russian-Turkish Liberation War of 1877-1878, the
surveying and mapping activities in the country have
mare than hundred year history. In comparison with
some other countries of similar size, historical fate and
economic potential, Bulgaria is well provided in geodetic
and cartographic aspect.
3.1. Geodetic Networks
On the territory of Bulgaria geodetic networks are
constructed consisting of about 60 thousand triangulation
points, 15 thousand bench marks, as well as 335
fundamental bench marks, about 400 gravimetric and
800 magnetic points. Due to the intensive development of
particular regions about 15% of the triangulation points
were destroyed and the portion of the destroyed
triangulation points in the settlements and in the industrial
areas may reach 40%.
81
Four tide gauge stations on the Black Sea coast, two
control measurement bases, one magnetic station and
one gravimetric polygon were built. A space station for
observation of earth artificial satellites for geodetic
purposes as well as a geodynamic station were built.
3.2. Topographic Maps
The country is covered with a topographic map at scale
of 1:25 000 with contour interval 5 and 10 m, as well as
with by-product maps at smaller scales. The maps are
five-coloured and are revised every 8-10 years.
The compilation of a large-scale topographic map began
in 1954 and was completed in 1984. About 90% of the
map for the intensive regions of the country is at scale of
1:5000 and about 10% of map for the high mountain and
forest regions is at scale of 1:10 000. The contour
interval is 1, 2, 5 and 10 m depending on the scale and
the terrain configuration. The map is five and three-
coloured and about 40% of it is updated.
For some specific purposes (mainly for investigation of
linear and hydro-technical projects) maps of scale of
1:2000 and larger are made.
3.3. Orthophotomaps
In the period 1981-1991 orthophotomaps without
contours were made at scale of 1:5000 of 60 thousand
Sq. km and at scale of 1:10 000 of 24 thousand sq. km of
the territory of the country. Orthophotomaps at scale of
1:2000 are prepared for some parts of the country.
3.4. Urban Maps
In Bulgaria there are above 5 thousand settlements of
different size and type as well as other settlement
formations (hamlets, railway stations, industrial zones).
For most of them maps at scale of 1:1000 and 1:500 are
made and for some central parts of the towns - also
maps at scale of 1:250. About 50-6096 of the urban maps
are actual. The maps are three-coloured with contour
interval 1 and 0.5 m
3.5. Cadastral Information
Orthophotomaps at scale of 1:2000, 1:5000 and 1:10 000
serve mainly as a basis of the rural cadastre. Maps at
scales of 1:1000, 1:500 and 1:250 serve as a basis of
urban cadastre.
A cadastral information system is created for about 20
thousand sq. km of the territory of Bulgaria and for
another 30 thousand sq. km input cadastral data are
collected to be entered into the system. The main
products of the cadastral information system are about
20 types of balances which contain summarized data on
definite indicators for each object. For those communes,
for which an information system is created (1896 of the
territory of the country) 8096 of the data necessary for the
land reform are available. The cadastral maps included in
the information system, are ready maps of the land and
serve as a basis of the land reform.
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B6. Vienna 1996
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