Tracing Geographical Origins of Teas Based on FT-NIR Spectroscopy: Introduction of Model Updating and Imbalanced Data Handling Approaches

Table 1

Description of tea samples.

Year	Group ID	Type	Group size	Tea gardens per group	Raw variables per sample
2014	2014IN	WY^a	495	33	4148
	2014OUT	NWY^b	165	11	4148
2015	2015IN	WY	687	74	4148
	2015OUT	NWY	100	10	4148

^aWY: authentic Wuyi rock-essence tea with a protected geographical indication (GI); ^bNWY: Non-Wuyi tea.