Table 2 Overview of the sensor parameters used in this study.

From: European beech spring phenological phase prediction with UAV-derived multispectral indices and machine learning regression

Sensor

Mega-pixel

Focal length [mm]

Pixel size [μm]

Sensor size [mm]

Sensor size [pixel]

Aspect

File type

GSD [cm] at 75 m

DJI phantom 4 Pro (hasselblad)

20

24

3.09

13.2 × 8.8

5472 × 3648

3:2

jpeg

2.64

Micasense rededge-MX

1.2

5.4

3.75

4.8 × 3.6

1280 × 960

4:3

tif

5.27

DJI zenmuse X7

24

24

3.91

23.5 × 15.7

6016 × 4008

3:2

jpeg

1.23

Micasense altum

3.2 0.02

8 (multi) 1.77 (LWIR)

4.25 11.9

7.16 × 5.35 1.9 × 1.43

2064 × 1544 160 × 120

4:3 4:3

tif

4.33 52.48