Global Wheat Head Detection (GWHD) Dataset: A Large and Diverse Dataset of High-Resolution RGB-Labelled Images to Develop and Benchmark Wheat Head Detection Methods

Table 4

The minimum metadata that should be associated with images of wheat heads.


	Session level	Image level

Experiment metadata	Name of the experiment (PUID)^†	Microplot id
	Name of institution	Row spacing
	GPS coordinates (°)	Sowing density
	Email address of the contact person	Name of the genotype (or any identifier)^†
	Date of the session (yyyymmdd)	Presence or not of awns
	Wheat species (durum, aestivum …)
	Development stage/ripening stage

Acquisition metadata	Vector characteristics:	Camera aperture
	Name	Shutter speed
	Type (handheld, cart, phenomobile, gantry, UAV)	ISO
	Sampling procedure	Distance from camera to canopy (m)^‡
	Distance to the ground (m)	Position of the image in the microplot^§
	Camera characteristics:
	Model
	Focal length of the lens (mm)
	Size of the pixel at the sensor matrix (μm)
	Sensor dimensions ()

This may be alternatively reported at the image level if it is variable within a session. ^†Persistent unique identifier (PUID). This may be a DOI as for genetic resources regulated under the on Plant Genetic Resources for Food and Agriculture (https://ssl.fao.org/glis) or any other identifier including the information of the maintainer of the genetic material, ripening stage. ^‡The distance between camera and canopy is an essential piece of information to harmonize dataset and calculate the density and should be carefully monitored during an acquisition. ^§In case of multiple images over the same microplot.