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Koncepcja harmonizacji baz danych tematycznych GUGiK i PIG w oparciu o jednorodny system danych referencyjnych

Sikorska-Maykowska M., Olszewski R.

Roczniki Geomatyki

2005

T. 3, z. 1

139-145

The paper deals with problems occurring during the integration of spatial data on geoenvironmental information stored in various thematic databases and map series based on them. The content and data processing technology used for creating the sozological database at the Head Office of Geodesy and Cartography (GUGiK) and the geoenvironmental database at the Polish Geological Institute (PIG) are analyzed, with main focus on their content compatibility and possibilities of integrating the geoinformation from both sources enabling their simultaneous use in spatial analyses. The main advantage of these resources, meant not only as analog maps, but principally as spatial databases, is their applicability for complex analyses employing GIS-based tools. From the end-user point of view, an important feature is thus the ability to integrate spatial data originating from various external sources. Using different basic sets of topographic data, or different vectorisation techniques of analog maps results in different modeling of the same topographic objects (e.g., rivers) into geometric objects in spatial databases of GUGiK, PIG and IMiGW (Institute of Meteorology and Water Management). Direct integration of these data is practically impossible. This problem would be solved by creating a coherent nationwide reference database and using it as the common topographic data source. Besides, at least partial harmonization of conceptual models of the thematic databases would allow to implement an interoperational system allowing joint analysis of the data. The concept of creating the spatial database infrastructure in Poland assumes creating several spatial databases containing basic(topographic or general geographic) reference data that would serve as a common geometric basis for the secondary thematic studies. At present, the Polish National System of Geographic Information (Krajowy System Informacji Geograficznej; KSIG) includes, among others.: General Geographic Databases (Ogólnogeograficzna Baza Danych) . with geometric accuracy as in analog maps in 1: 250,000 scale or less), VMap Level 2 database -with geometric accuracy as in analog maps in 1: 50,000 scale, Topographic Data Base (Baza Danych Topograficznych) . with geometric accuracy as in analog maps in 1: 10,000 scale. Creating a rational concept of SDI in Poland requires not only developing reliable reference databases, but also harmonization of the thematic databases managed by different institutions. Obviously, the state reference system should be the topographic data source for thematic studies. Thus, all presently developed Polish thematic projects of this kind should use as their topographic data source the Map L2 database (currently being updated using ortophotomaps), and later the so-called Topographic Data Base Level Two.