Intelligent mobile phone tree measuring device and tree measuring method thereof

A smart phone and tree measuring technology, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of poor accuracy, difficult data acquisition, low efficiency, etc., achieve high-efficiency measurement, and reduce the effect of measurement work intensity

Inactive Publication Date: 2019-11-05
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the shortcomings of difficult data acquisition, low efficiency, and poor accuracy in the traditional method of measuring the diameter of standing trees, improve t

Method used

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  • Intelligent mobile phone tree measuring device and tree measuring method thereof
  • Intelligent mobile phone tree measuring device and tree measuring method thereof
  • Intelligent mobile phone tree measuring device and tree measuring method thereof

Examples

Experimental program
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Embodiment Construction

[0020] 1. First, fix the flower pole at a distance of 30cm from the standing tree to be tested, and set up the mobile phone on the bracket of the flower pole.

[0021] 2. The mobile phone records the geodetic coordinates B, L, and H of this location, and converts them into plane coordinates X, Y, H. Use the mobile phone to take a horizontal and upright photo of the standing tree to be tested to ensure that the standing tree to be tested is clearly imaged in the photo.

[0022] 3. Using mathematical models① where (u i , v i ) is the image point coordinates of any point on the photo, (X i , Y i ,Z i ) is the coordinates of the image object space corresponding to the coordinates of the image point, f represents the focal length, and the coordinate relationship is expressed as a mathematical model② Using mathematical models③ Among them, d represents the diameter of the standing tree, and △u represents the variation of the abscissa of the image square along the left and ri...

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Abstract

The invention discloses an intelligent mobile phone tree measuring device and a tree measuring method thereof. An intelligent mobile phone is erected by utilizing a flower rod, a standing tree in a to-be-measured area is measured by normal case photography, and coordinates B, L and H and rotation angles phi, omega and kappa can be determined according to a mobile phone positioning function and anelectronic compass; and by utilizing a collinearity equation principle, according to the distance between the flower rod and the to-be-measured tree, the focal length f and image point image space coordinates (ui, vi) of corresponding feature points, object space coordinates (Xi, Yi, Zi) of corresponding points are calculated out, and then the diameter-at-breast-height value of the standing tree is calculated.

Description

[0001] 1. Technical field [0002] The invention relates to a tree measuring method in forestry surveying, in particular to a smart phone tree measuring device and a tree measuring method thereof. [0003] 2. Technical background [0004] DBH is an important factor in forest measurement. At present, DBH is measured manually using a DBH ruler or a caliper, which is a contact measurement. Due to the influence of terrain and understory shrubs, it is time-consuming and laborious to measure the DBH of each sample tree in the sample plot, requiring one person Measurement, one person records, the labor cost is high, and the measurement efficiency is low. [0005] In the present invention, under the condition of flat ground and terrain with breast height markings, the smart phone is used to take near-horizontal upright photography of the terrain to be measured, and the mobile phone is mounted on the flower pole to realize the measurement of the diameter at breast height of standing tre...

Claims

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Application Information

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IPC IPC(8): G01B11/08
CPCG01B11/08
Inventor 冯仲科朱妍
Owner BEIJING FORESTRY UNIVERSITY
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