Vegetation Cover Estimation Quiz: Correct Answers
Accurate visual estimation of vegetation cover is one of the most important skills in vegetation science. The images below were used in a short vegetation cover estimation test. The number shown under each image is the true percentage cover of the green patches in the image.
To support training and calibration of observers, JUICE.NET contains a dedicated tool for generating artificial vegetation patterns with known cover values.
The tool is available in the menu Simulations. It creates vegetation-like patterns with adjustable cover, clustering intensity, number of clusters, and cluster radius. The true cover value is calculated automatically and can be used for testing, training, and calibration of cover estimates.
The generated patterns can be used for student training, observer calibration, teaching exercises, methodological studies, and experiments focused on the accuracy and reproducibility of visual cover estimates.
The images below were used in the vegetation cover estimation quiz published in the IAVS Bulletin. Participants were asked to visually estimate the percentage cover of vegetation in a series of artificially generated vegetation patterns with known cover values.
The original quiz is available online at: https://forms.gle/NTshAsu1N9veRVDY8
The values shown below represent the true vegetation cover of each image and can be used to evaluate the accuracy of individual estimates.
Image B0.7%Vegetace_0.7pct_20260531_112454.png
Image K0.9%Vegetace_1.2pct_20260531_113544.png
Image P1.2%Vegetace_1.5pct_20260531_112739.png
Image N1.5%Vegetace_3.0pct_20260531_112913.png
Image E3.0%Vegetace_5.7pct_20260531_113742.png
Image H5.7%Vegetace_6.6pct_20260531_115722.png
Image A6.6%Vegetace_21.6pct_20260531_115902.png
Image M21.6%Vegetace_21.6pct_20260531_115902.png
Image D24.2%Vegetace_24.2pct_20260531_120007.png
Image G45.9%Vegetace_45.9pct_20260531_120321.png
Image J51.7%Vegetace_51.7pct_20260531_120150.png
Image L71.2%Vegetace_71.2pct_20260531_120503.png
Image C78.3%Vegetace_78.3pct_20260531_120701.png
Image F84.2%Vegetace_84.2pct_20260531_120820.png
Image I92.6%Vegetace_92.6pct_20260531_121151.png