The article presents the person and works of Georgy Voronoi (1868-1908), the inventor of an original method of diagrams, a student of the famous mathematician Andrey Markov. Georgy Voronoi graduated from the Department of Physics and Mathematics at the University of St. Petersburg, and subsequently worked as a professor of mathematics at the Imperial University of Warsaw. One of his students was the future outstanding Polish mathematician Wacław Sierpiński. In his brief lifetime G. Voronoi published several important scientific articles on number theory. In an almost 100 page paper in French published in 1908 he described a method of diagrams, or polygons, which became known as the method of Voronoi diagrams. In the digital age this method and its modifications found new applications. The entry “Voronoi” is getting more popular on the Internet, and the method of Voronoi diagrams and its modifications are widely described in handbooks and scientific articles. The article presents application of the method in the most popular computer programs from the Geographic Information System (GIS) group and presents examples of its usage in research on geographic space in various scientific disciplines.

The present research covers the issue of prediction of changes of the land use appearing due to progressing urban sprawl process in Piaseczno county, located in the Warsaw Metropolitan Area. The Dyna-CLUE land use change model was applied, assuming a variety of scenarios pertaining to the direction of change of land use within a time prospect of 20 and 35 years. The scenarios pertaining to the expected land use changes are developed with consideration given to the expected population changes. When implementing the Dyna-CLUE model, 8 factors having impact on the land use patterns within the research area are considered. As a result of the modelling, maps demonstrating the expected land use patterns have been created, making it possible to indicate municipalities and areas within which there is the highest probability of emergence of new buildings.

One of the two highest levels of Internet domains has its geographical dimension. It consists of the so-called country-code domains (ccTLDs) assigned to the individual countries of the world according to the standard ISO 3166. Some of these domains took over the role of worldwide functional domains and large income from their sale caused economic and social changes in the countries with attractive country-code domains.