Geography Reference
In-Depth Information
The DTA-200 2.0 was released also in 1998. This was available in the most
commonly used file formats (MicroStation/DGN, MapInfo, AutoCad/DWG and
DXF). Based on this, the continuously updated databases of DTA-500 and
DTA-1000 were also created in 1:500,000 and in 1:1,000,000 scales (Zentai
2012
).
Cadastral Maps
The very first IT developments in this sector were started at the
Budapest Geodetic
and
Cartographic
Enterprise
(BGTV) in 1974. Although they started the first test of
digitizing large scale cadastral maps in 1975, the real digitizing process was started
only after 1990 due to the very large number of these sheets, when both the
technical and the political circumstances made this process feasible.
The following requirements were taken into consideration:
• the process should be uniform and authoritative (“state sealed”);
• it should fulfil the national and European demands concerning the technical,
economic, business and legal demands;
• be conform to the national and international standards (precision, data format);
• allow the users the conversion of map data between different projections and
legends.
The estimated time of the digitization process (about 60,000 map sheets) was
15 years. In 1996 the national data standards for cadastral maps were established
(DAT) and the
National Cadastral Programme
Non-Profit Company (NKP Kht.)
was formed. This organization controlled and supervised the process and, with the
contribution of the local land offices, they managed the final acceptance. The law on
land surveys and cartography stated that these digital cadastral maps should be the
base of municipality GIS.
The DAT-Standard gives prescription of
the following main groups of
information:
• cadastral and real estate data,
• natural and man-made features.
Prescriptions are formulated as adequate to resolution available in the scale
range 1:1,000-1:4,000. The data handling unit is the settlement.
The sheets of the residential areas were digitized by 2002. After Hungary joined
the European Union, the process of digitizing the cadastral maps of rural areas had
to be speeded up. The European Union specified that this database should be ready
by the end of 2005.
