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A comparison of Sub-Pixel and maximum likelihood classification of Landsat ETM+ images to detect illegal logging in the tropical rain forest of Berau, east Kalimantan, Indonesia
2. Study Area
The Labanan forest concession area is found in East Kalimantan, which is an Indonesian province, located in the eastern part of the Island of Borneo (Figure 1). The entire concession area covers 83,240 ha of which 54,567 ha is under fixed production, 26,997 ha under limited production and 1,676 ha has been used for other purpose such as transmigration, camping for logging and cruising crews, settlement and agriculture (Fakul tas kehutanan, 2000) cited from Dahal (2002). The area receives 1500-3000 mm rainfall per year. The forest of the Labanan area is known as lowland mixed Dipterocarp forest, because the family Dipterocarpaceae is dominant. PT. Inhutani I, a state owned forest concession company manages this concession area. The adopted silvicultural system for the management of the forest in the area is known selective cutting and planting (TPTI). According to the national guidelines, an average of 8 trees per hectare are logged at 35 years interval (Charls, 1996; Sist et al., 2003). Based on this management system, the Labanan concession area has been divided in to seven compartments (known as RKL: Recana Karya Limathahum locally). Each RKL has been further subdivided in to five annual coups and logging has been taking place progressively since 1976. At present, the logging has been going on in RKL six. According to the plan available in concession office, RKL seven is still in un-logged condition and the end of the first felling cycle will be reached in 2011, when logging will be carried out in the last i.e. 35th coup of RKL seven. Figure 2 shows the five-year working plan (RKL) map of the study area.  Figure 1. Location of the study area  Figure 2. Map of study area’s five-year working plan (RKL) |