Landscape block of geoinformation system

Expirience of constructing landscape block of geoinformation system, designated for regional geoecological forecasting on the basis of mega-line-Delta computer is presented. Works were conducted in summer of 1986 for the purpose of forecasting radionuclide migration in 30-km zone of the Chernobyl accident, as well as evaluation of radioecological situation in Kiev, Zhitomir and Chernigov regions. System design work lies in choice and construction of information model of the natural medium, reflected and processed in data bank by methods of information science. Three groups were distinguished in examined region according to intensity of substance migration: 1) zones of preferred evacuation with surface run-off, 2) transit zones, 3) zones of evacuation and accumulation of flood plain substance