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Fig. 10 | Plant Methods

Fig. 10

From: THEMS: an automated thermal and hyperspectral proximal sensing system for canopy reflectance, radiance and temperature

Fig. 10

A 2017 time series of vegetation indices ad, daily mean GPP and shortwave down-welling radiation ‘SW↓’ (d and e, respectively). Vegetation indices are calculated from solar noon scans with an 80° symmetric FOV centred on 0° azimuth. Vegetation indices are coloured by the sky stability indicator. Linear regression R2 and slope values use daily observations correlated with daily GPP and are inserted in each subplot. The first row of the R2 and slope values use all valid data (n = 326), and the second line uses the filtered data with a sky stability threshold > 30 (n = 109). All p-values < 0.001. Some outliers are outside the y-axis bounds to maintain figure clarity

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