Table 1.

Size of ground images (length and width) and effective pixel dimensions (Instantaneous Field of View = IFoV) as affected by sensor resolution and measurement altitude

Camera	Lens (focal length)	Sensor resolution	Sensor dimensions	Image parameter	Altitude 290	300	310
	mm	pixel	mm		m	m	m
NIR	60	4282 × 2848	22.2 × 14.8	length	107.6	111.3	115.5
				width	71.5	74.0	76.5
				IFoVa	0.025	0.026	0.028
RGB	60	3898 × 2595	22.2 × 14.8	length	107.3	111.1	114.7
				width	71.4	73.9	76.4
				IFoV	0.0275	0.0285	0.0295
IR	75	640 × 480	14.9 × 11.2b	length	61.9	64	66.1
				width	46.4	48	49.6
				IFoV	0.096	0.1	0.103

^aIFoV = (pixel dimension*distance)/focal length.

^bIFoV = (sensor pixel size* distance to ground)/focal length, derived from companies IFoV calculator.