Tree canopy structure information extraction method based on rib method and crown height ratio

Abstract

The invention discloses a tree canopy structure information extraction method based on a rib method and the crown height ratio. The measurement method comprises the steps that firstly, based on single-shot echo point cloud data, a crown height model is established, namely, on the basis of a digital terrain model, non-vegetation information is filtered out to obtain a reference map only containing vegetation distribution and height information; secondly, based on a local maximum search method of an active window, the vertex of each single standing tree is extracted from the reference map; thirdly, on the basis of a treetop detection result, crown projection boundary identification is carried out through the rib method, single trees are separated, the boundary position of the crown of each tree is determined, and a crown boundary identification result is obtained; fourthly, in combination with the treetop detection result and the crown boundary identification result, a single-tree crown volume distribution diagram is generated through a crown volume calculation method based on a telescopic circle and the crown height ratio; fifthly, the image average gradient is calculated to inverse the canopy porosity and correct calculation errors caused by a large number of gaps existing among branches and leaves inside the crowns, so that the crown volume inversion accuracy obtained in the fourth step is further improved.

Description

technical field [0001] The invention relates to a tree canopy structure information extraction method based on the rib method and canopy height ratio, in particular to a method for detecting the canopy boundary and measuring the canopy volume by using an airborne laser radar system. Background technique [0002] Green space is the only living infrastructure in the city, and it is also the core component of the urban ecosystem. Many studies have proved that urban green space plays an indispensable and positive role in improving the urban ecological environment and promoting human health. [0003] As a new type of earth observation technology, remote sensing has the advantages of large-area synchronous coverage, real-time continuous, cost-effective and so on. Multi-source remote sensing data such as high-resolution remote sensing and lidar provide new perspectives and research directions for space detection. Among them, the fully automatic and high-precision three-dimensiona...

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Problems solved by technology

[0008] Aiming at the problems of scattered urban green distribution, various structures, insufficient research on three-dimensional green quantity extraction technology based on complex urban features, weak automation, and low precision, the present invention provides a method that can be used to realize different unit The technical process of canopy edge detection, canopy volume estimation and canopy structure information extraction of solid tree species

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