Table 4. Comparison of forest biomass using machine learning models and FREL.

	Year	Forest area (ha)	Average of biomass per ha (ton)	Total biomass (thousand tons)
kNN	2013	517,617	66.1	34,239
	2017	512,136	66.5	34,078
	2020	515,979	62.8	32,382
RF	2013	517,617	65.5	33,892
	2017	512,136	66.1	33,836
	2020	515,979	64.4	33,219
FREL	2013	517,617	111	57,455
	2017	512,136	111	56,847
	2020	515,979	111	57,273