Table 6 Selected plant trait indicators which may be computed using the collected dataset and provided post processing software
From: A spatio temporal spectral framework for plant stress phenotyping
Acronym | Full name (unit) | Description |
|---|---|---|
Height | Height (m) | Height (=Z coordinate) above the soil reference height. Negative values are ignored |
NDVI | Normalized difference vegetation index (−) | Defined as \((NIR-R)/(NIR + R)\), where NIR is the near infrared (803 nm)and R is the red (670 nm) reflectance respectively [61] |
HS* | Hyperspectral reflectance (−) | Hyperspectral reflectance, where *\(\in \{1,\ldots , 25\}\) indicates the spectral band index |
EGI | Excess green index (−) | Defined as (\(2G-R-B\)), based on the color reflectance [62] |
NEGI | Normalized excess green index (−) | EGI divided by \((R + G + B)/3\) |
NDRI | Normalized difference red index (−) | Defined as \((G - R)/(G + R)\), based on color values |
ERI | Excess red index (−) | Defined as \(1.4R - G\), based on color reflectance |
HSDiff*\(^1\)_*\(^2\) | Difference in hyper spectral reflectance (−) | Difference in reflectance of two hyperspectral bands *\(^1\)–*\(^2\), where *\(^1\), *\(^2\) \(\in \{1,\ldots , 25\}\) indicates the spectral bands |
CanCov | Canopy cover (−) | The percentage of points labeled as plants. Canopy cover is independent of the evaluation statistic |
VolEst | Volumetric estimate (m*pixels) | The integral over the height of all points. Volumetric estimate is independent of the evaluation statistic |