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General geographic database publishing in the internet
Języki publikacji
Abstrakty
The General Geographic Database is regarded as one of elements of the Polish Spatial Information Infrastructure. The users of the Database are administrative authorities at the central and regional levels as well as other institutions. The General Geographic Database (GGDB) has been created with the detail of data corresponding to scales: 1:250 000, 1:500 000, 1:1 000 000, 1:4 000 000. It encompasses spatial data subdivided onto eight thematic groups: administrative division, urban area and anthropogenic objects, hydrography, elevation, transportation, land use, protected areas and geographical names. The General Geographic Database plays also an integrated role to other official spatial databases, using identifiers of objects and phenomena registered there in the attributes of particular data layers. The GGDB is distributed by the Geodetic and Cartographic Documentation Centre in the framework of the routine distribution procedure. Additionally, the Database is available in the Internet by using a map server based on the ArcIMS solution of the ESRI. The process of preparing the original GGDB to the form used in the Internet has been described in the paper. In the first stage the Database structure has been converted to the form manageable by other ESRI product - ArcSDE. It is an efficient spatial data management programme, facilitating access to data and speeding up retrieval process. A number of adaptation steps has been performed, resulting in the new optimised data structure which have additional security features. The next stage has been focused on the graphic user interface (GUI) design. Several windows or sections of screen have been distinguished in order to implement a basic functionality of the interface. A number of functions enabling access, retrieval, selection, analysis, zooming and panning as well as legend arrangement has been integrated with GUI. All together 14 functional buttons are at the disposal of the user. The data visualisation in the form of maps is performed by a set of cartographic symbols especially designed for the Internet portraying of the spatial data. The definition of all symbols has been done using ArcXML language, which is an extension of the XML format. Four of the scale levels of the GGDB are displayed in the same interface and user is automatically transferred to one of the set relevant to the required scale at which the data appear on the screen. The Database volume accessed by the developed Internet application is equal to approximately 500 MB and is transferred to the users common Internet browser in the form of graphic packages, optimised in size. The General Geographic Database publishing in the Internet is one of the first steps to establish Polish Spatial Information Infrastructure and move forward to the realisation of the idea of the information society.
Czasopismo
Rocznik
Tom
Strony
39--45
Opis fizyczny
Rys.
Twórcy
autor
- Centrum Informacji o Środowisku UNEP/GRID-Warszawa
autor
- Centrum Informacji o Środowisku UNEP/GRID-Warszawa
autor
- Centrum Informacji o Środowisku UNEP/GRID-Warszawa
Bibliografia
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPW6-0010-0017
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