Table 2. Observed wind speeds (ms-1) from the drone, WPF, and AWS, and their differences (Drone−WPF or Drone−AWS) at each hovering altitude (m AGL). Values in parentheses indicate AWS observations used at 10m AGL where WPF data are unavailable. Labels (1) and (2) denote successive about 10min averaging periods; (up) and (down) indicate ascending and descending phases, respectively

(a) ~10min averaging period
Exp. No	AGL (m)	Drone	WPF(or AWS)			Difference	Drone	WPF(or AWS)	Difference
Exp.1		(1)14:30-14:40 8 AUG 2024					(2) 14:40-14:50 8 AUG 2024
	150	5.2	2.1			3.1	5.2	1.5	3.7
Exp.2		(1) 16:00-16:10 8 AUG 2024					-
	200	6.7	6			0.7		-
Exp.6		(1) 10:40-10:50 26 SEP 2024					(2) 10:50-11:00 26 SEP 2024
	300	1.5	4.8			−3.3	1.7	4.9	−3.2
Exp.8		(1) 15:30-15:40 26 SEP 2024					(2) 15:40-15:50 26 SEP 2024
	300	2.1	2			0.1	3.8	1.5	2.3
(b) ~1min averaging period
Exp. No	AGL (m)	Drone		WPF(or AWS)	Difference		Drone	WPF(or AWS)	Difference
Exp.3		(up) 13:00-13:10 6 SEP 2024					(down) 13:10-13:20 6 SEP 2024
	10	2.7	(2.8)			(−0.1)	1.8	(2.2)	(−0.4)
	100	3.8	2.7			1.1	2.9	2.6	0.3
	150	3.9	2.4			1.5	3.2	2.2	1
	200	3	1.9			1.1	4.1	1.7	2.4
	250	3	1.5			1.5		-
Exp.4		(up) 13:30-13:40 6 SEP 2024					(down) 13:40-13:50 6 SEP 2024
	10	1.3	(2.2)			(−0.9)	1.6	(2.1)	(−0.5)
	150	4	2.5			1.5	3.7	1.6	2.1
	200	2.4	2.2			0.2	3.6	1.3	2.3
	250	2.6	1.9			0.7	3.7	1	2.7
	300	2.8	1.4			1.4		-
Exp.5&Exp.7		(Exp. 5, up) 10:10-10:20 26 SEP 2024					(Exp. 7, up) 15:00-15:10 26 SEP 2024
	10	2.2	(0.6)			(1.6)	2.6	(1.5)	(1.1)
	100	4	4.8			−0.8	4.4	3.9	0.5
	200	4.6	4.2			0.4	2.6	0.8	1.8
	300	4.4	3.6			0.8	1.8	0.4	1.4
	400	3.1	2.9			0.2	2	1.2	0.8
	500	3.3	3.7			−0.4	1.5	0.8	0.7