Theory of Gap Fraction

Summary

Gap Fraction is a crucial variable that governs interactions between light and vegetation and requires accurate modelling to predict light climate in the canopy, photosynthetic activity or canopy reflectance.

Principle

The Gap Fraction (GF) is calculated using the following equation:

where nground is the number of ground points and n is the total number of vegetation and ground points. Note that all LiDAR points with a normalized height lower than the user-defined height break (2m is commonly used) are treated as ground points in gap fraction calculation (Richardson et al.,2009).

    @inproceedings{
        author={Richardson J J, Moskal L M and Kim S H},
        title={Modeling approaches to estimate effective leaf area index from aerial discrete-return LIDAR},
        booktitle={Agricultural and Forest Meteorology,149: 1152-1160},
        year={2009}
    }

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