Hemispherical
photography, also known as fisheye or canopy photography, is a technique
to estimate solar radiation and characterize plant canopy geometry using
photographs taken looking upward through an extreme wide-angle lens (Rich
1990). Typically, the viewing angle approaches or equals 180-degrees, such that
all sky directions are simultaneously visible. The resulting photographs record
the geometry of visible sky, or conversely the geometry of sky obstruction by
plant canopies or other near-ground features. Source
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