Browsing by Subject "atk"

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  • Tan, Jimin (The Society of Forestry in Finland - The Finnish Forest Research Institute, 1992)
    A system was developed that applies geographical information system (GIS) techniques for the manipulation of spatial data in the planning of forest road networks. The system uses shortest path algorithms for analysing terrain transportation, road transportation and road construction in a given planning area. A greedy-heuristic algorithm was developed to automate the locating of roads. Using the alternative locations of a forest road network, the system calculates many values (such as terrain transportation distance, terrain transportation cost, road transportation cost, road extending length, and the cost of constructing a new road) which are useful in carrying out sensitivity analyses. The system is applicable as an aid in the selection of forest road standards. Bounded road catchment area and limited road extending reach were used in road locating by the greedy-heuristic algorithm to achieve better road locating results. A local network routing model was developed for improving the capacity of the system. Data for part of the Ylikemi Forest District in N. Finland were selected to demonstrate the system.
  • Äärilä, Tiina (Helsingin yliopisto, 2002)
    Verkkari 2002 (11)