engleski

The Example of Applying GIS and DEM in Forestry

The goal of this paper was to create DEM (Digital Elevation Model) and establish GIS model on the territory of the forest “ Mačkovac” for the purpose of forest planning. We tried to collect as much available information from various sources for the area of research as we could and put them together in one data base. Such base will enable us to systematically collect data that would supplement one another and for a certain period of time enable us to make an insight into the time sequence of information on the development of particular forest. The base of collected data was Croatian Basic Map (CBM) at 1:5000 scale, cyclical aerial photographs of the Republic of Croatia (1:20000) and management bases for the researched area. Based on those data a GIS model of the forest &laquo ; ; Mačkovac&raquo ; ; was created. By the further processing a 3D (TIN-Triangulated Irregular Network) model of the terrain was created, in which all the other elements relating to obtaining even more realistic overview of this area were input. GRID model of the terrain was created from TIN, followed by the: calculation of the slope of the terrain, calculation of the exposition in degrees from 0 to 360o, showing the insolation of the terrain, which is especially important for environmental research (for calculating the insolation of tree crown and duration of insolation in particular seasons). Contours of terrains for both models are also drawn. The final result of the established GIS model was a number of obtained thematic layers (forest-management map ; map of tree age classes ; map of structural classification ; map of silvicultural forms, map of timber cutting plan etc.) and 3D demonstrations (3D demonstrations of elevation ; demonstration of the slope of the terrain ; demonstration of expositions ; demonstration of insolation etc.) needed in forestry. Utilizing such data models assures data flexibility and the possibility to supplement them by new information connected to everyday work of cultivating, planning, exploiting forests and making plans in forestry.

GIS model; digital elevation model (DEM); TIN; GRID; cyclical aerial photographs; forest planning

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