Estimation of Forestry-Biomass using k-Nearest Neighbor(k-NN) method

The purpose of this study was to estimate of forestry-biomass using by k-Nearest Neighbor (k-NN) algorithm with the Landsat TM and field survey data in research forest of Kangwon national university. Optimum reference plots (k) were selected to estimate the forest biomass based on the minimum horizontal reference area (HRA) and spatial filtering using DN (Digital number), NDVI (Normalized difference vegetation index) and TC (Tasseled cap). The accuracy of RMSE was better in the order: DN, NDVI, and TC, respectively. In the DN value application, the RMSE of coniferous and broadleaved trees had the minimum value when k=11 of BRA 4 km and k=6 of HRA 10 km with 7by7 filtering. The bias of each was overestimated by 1.0 t/ha and 1.2 t/ha respectively. On the other hand, the minimum RMSE of Pinus koraiensiss had at k=8 and HRA of 4km without filtering and the bias were underestimated by 1.6 t/ha. As a result, the estimated total forestry biomass was 802,000 t and 252 t/ha for k-NN methods. The results were higher than the plot data estimation by 16 t/ha. In this study, it is able to precise forest biomass at regional forest.