Method for measuring three-dimensional structure of forest gap

Abstract

The invention relates to a method for measuring a solid structure of a forest gap which includes the following steps of: using a digital camera provided with a fish-eye lens to vertically upwards shoot two semi-spherical images at the different height of any position in the forest gap; measuring the parameters of the forest gap; processing the two semi-spherical images and recording the coordinates of the edge points of a forest canopy in the forest gap; calculating the area and the shape of the forest gap and the heights of the forest canopy of the forest gap of each orientation according to the protection principle of the fish-eye lens as well as each coordinate point and the parameters of the forest gap. The invention firstly provides a method for measuring the solid structure of the forest gap, can fast and objectively measure the area and the shape of the forest gap and the heights of the edge wood of the forest gap of each orientation, is easily used, only two semi-spherical images is shooted when measuring the area and the shape of the forest gap, only two parameters of a gradient and an aspect are added when calculating the heights of the edge wood of the forest gap of each orientation with higher measuring precision; besides, the measuring result is not affected by the measuring position.

Description

technical field [0001] The invention relates to a method for measuring the characteristics of forest gaps in the fields of forestry and ecology, in particular to a method for measuring the three-dimensional structure of forest gaps. Background technique [0002] Gap refers to the space formed by the death of one or more canopy trees that will be occupied and renewed by new individuals. This concept arose with the study of forest cycle. Gap disturbance is an important small-scale disturbance that often occurs in forest communities, and has become one of the most active research fields in forest ecology. Light is the environmental factor with the most dramatic changes in forest gaps. Due to the diurnal and seasonal changes in solar altitude and azimuth angles, the complex three-dimensional structure of gaps (mainly referring to the size, shape, and height of wood canopy at the edge of gaps in different azimuths) ) and the impact of forest gap micro-topography, forest gap illu...

AI Technical Summary

Problems solved by technology

Although there are many methods for measuring the size of forest gaps, so far, there is no simple, objective and general method for measuring the size of forest gaps; at the same time, there are very few studies on the measurement of forest gaps, and many researchers simply According to the ratio of the long axis to the short axis of the gap, the gap is divided into two types: linear and non-linear; in addition, there is no research involving the measurement of the canopy height of the gap edge trees in different orientations.

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