Road Network
The road types map was generated based on topographical map (1/25000) of the study
area. In order to develop network database, transportation cost of logging truck on each road
section was computed based on five parameters road length, road type, road condition,
average vehicle speed and travel time. Thus, “Attribute Table” of the road map included
fields for these parameters.
The road length was calculated by “Calculate Geometry” tool in “Attribute Table”. The
road types in the study area were divided into three classes including access roads, main
forest roads, and secondary forest roads. The road conditions (good, average, poor) were
determined based on information obtained from Forest Enterprise Directorate. Then, the
average vehicle speed was estimated based on road types and road conditions (Table 1).