A technical method for oblique photography of UAVs in fixed plots of forests

Abstract

The invention discloses a forest fixed sample area unmanned plane oblique photograph technical method. According to the method, an unmanned plane oblique photographing technology is used, a geometric scheme relation among a base length B between two photograph points of an unmanned plane, a flight height H from a take-off place of the unmanned plane, an unmanned plane oblique photographing angle omega, a camera photograph field angle beta of the unmanned plane and an edge length a of a forest fixed sample area is established for three different terrains (flat ground, uphill ground and downhill ground) of the forest fixed sample area, so that an optimum flight scheme for different terrain situations can be respectively designed. On the basis of the optimum flight scheme, various parameters of the forest sample area can be measured and acquired, and finally the biomass and stand volume of the forest can be solved.

Description

[0001] 1. Technical field [0002] The invention relates to a data acquisition method for sample tree measurement and three-dimensional modeling in the survey of fixed forest plots, in particular to a technical method for oblique photography of unmanned aerial vehicle fixed plots in forests. [0003] 2. Technical background [0004] The methods used in the traditional survey of fixed forest plots are mainly to combine artificial ground regular measurements with aerial remote sensing and space satellite remote sensing to assist forest resource surveys, and the current method of using UAV aerial photography and upright photography, but the above-mentioned technologies The method has obvious shortcomings and deficiencies in actual operation practice: [0005] ①Using ground sample plots for regular measurements requires a lot of manpower and material resources, high cost, high work intensity, and long measurement cycles, especially for sudden forest fire disasters, it is difficult ...

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Problems solved by technology

[0005] ①Using ground sample plots for regular measurement requires a lot of manpower and material resources, high cost, high work intensity, and long measurement cycle, especially for sudden forest fire disasters, it is difficult to carry out investigations

[0006] ②Using ordinary manned aerial remote sensing requires high cost and poor security due to the need for many links such as transition

[0007] ③When using aerospace satellite remote sensing monitoring, since the sensor is above the cloud layer, the image clarity is greatly affected by the cloud layer. High-resolution remote sensing satellites are all launched by commercial satellites, and the images are expensive. The revisit cycle is fixed, and the characteristic location at a specific time is obtained difficult to visualize

[0008] ④Using UAV upright photography technology to observe forest plots, usually only canopy information can be obtained, but tree parameter information for calculating biomass and stock volume is difficult to obtain, which is of little significance to the measurement of forest fixed plots

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