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Method for quickly extracting tree heights jointly by aid of total-station instruments and unmanned aerial vehicle images

An extraction method and unmanned aerial vehicle technology, which is applied in the directions of instruments, surveying and navigation, photogrammetry/video metrology, etc., can solve the problem of missing information in local areas, and achieve the effect of avoiding tedious work and simplifying the work process

Inactive Publication Date: 2017-08-18
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the lack of information in local areas due to the mutual occlusion of tree crowns in the image data acquired by the existing single UAV, and propose a total station and UAV A Fast Extraction Method of Tree Height Based on Image Combination

Method used

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  • Method for quickly extracting tree heights jointly by aid of total-station instruments and unmanned aerial vehicle images
  • Method for quickly extracting tree heights jointly by aid of total-station instruments and unmanned aerial vehicle images
  • Method for quickly extracting tree heights jointly by aid of total-station instruments and unmanned aerial vehicle images

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specific Embodiment approach 1

[0021] Specific embodiment one: a kind of total station and unmanned aerial vehicle image combined tree height rapid extraction method comprises the following steps:

[0022] Step 1: Utilize unmanned aerial vehicle to gather the image of woodland, utilize total station or GPS-RTK to gather the terrain data of woodland; Described terrain data includes coordinate of control point and broken step point coordinate;

[0023] Step 2: Perform directional splicing on the images collected by the UAV in Step 1 and the coordinates of the control points to obtain the digital orthophoto image (DOM) of the woodland, and perform stereoscopic observation of the digital orthophoto image data of the forest land to obtain the coordinates of the treetop points;

[0024] Step 3: Use the natural growth algorithm (Delaunay) to generate an irregular triangulation from the terrain data collected in Step 1;

[0025] Step 4: Using the treetop point coordinates obtained in step 2, perform elevation inter...

specific Embodiment approach 2

[0026] Specific embodiment two: the difference between this embodiment and specific embodiment one is: UAV is used to collect the image of forest land in the described step one, and the specific process of utilizing total station or GPS-RTK to collect the terrain data of forest land is:

[0027] Determine the flight route and flight height of the UAV, the course overlap rate of the UAV is greater than or equal to 60%, and the side overlap rate is greater than or equal to 30%; set the ground control point, and use the total station or GPS-RTK to measure the coordinates of the ground control point , each route has more than 6 ground control points; the total station or GPS-RTK uses the control points to collect the coordinates of the forest area topography.

[0028] The route setting is to determine the flight route and flight height of the UAV according to the actual situation of the forest area and the required aerial photo resolution. When determining the route, it is necessar...

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in the step two, the image and the coordinates of the control points collected by the drone in the step one are oriented and spliced ​​to obtain the digital orthophoto image of the woodland. The specific process of obtaining the coordinates of treetop points through stereoscopic observation of digital orthophoto image data of forest land is as follows:

[0034] Step 21: internal orientation of the image; the internal orientation is carried out to the image obtained in step one to complete the scanning coordinates (scanning coordinates formed due to the position of the image on the scanner during the image digitization process) to the image coordinates (based on the image image) The point is the origin of the coordinate system. For aerial images, the line connecting two opposite sides of the mechanical frame mark is the coordinate system frame mark coordinate system of...

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Abstract

The invention discloses a method for quickly extracting tree heights jointly by the aid of total-station instruments and unmanned aerial vehicle images, and relates to methods for quickly extracting tree heights jointly by the aid of total-station instruments and unmanned aerial vehicle images. The method includes firstly, acquiring images of forest lands by the aid of unmanned aerial vehicles and acquiring topographic data of the forest lands by the aid of the total-station instruments or GPS-RTK (global positioning system-real-time kinematic measurement); secondly, directionally stitching the images acquired by the unmanned aerial vehicles and coordinates of control points to obtain digital orthographic images of the forest lands, and stereoscopically observing data of the digital orthographic images of the forest lands to obtain coordinates of treetop points; thirdly, generating irregular triangular nets from the topographic data by the aid of natural growth algorithms; fourthly, carrying out elevation interpolation on the irregular triangular nets, solving coordinates of the grounds below the treetop points and solving elevation difference values between the coordinates of the treetop points and coordinates of tree root points. The coordinates of the grounds below the treetop points are used as the coordinates of the tree root points. The method has the advantages that the problem of local region information loss of image data acquired by single unmanned aerial vehicles due to the fact that tree crowns are shielded by one another can be solved by the aid of the method; the method can be applied to the field of forestry remote sensing.

Description

technical field [0001] The invention relates to a method for quickly extracting tree heights combined with a total station and an unmanned aerial vehicle image. Background technique [0002] With the continuous development of unmanned aerial vehicle (UAV) technology, its application in forestry is becoming more and more extensive. Today, as forest resources are dwindling, it is particularly important to achieve accurate and non-destructive measurement of individual trees and forest stands. In the past rough forest resources survey and monitoring, tree height measurement was done by visual estimation or simple instrument and method measurement, the accuracy is relatively poor, and it cannot meet the requirements of "precision forestry" and "digital forestry". In addition, the forest structure in the high canopy density forest is complex, and the canopy is seriously occluded from each other. How to accurately and comprehensively obtain the tree height light forest structure p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00
CPCG01C11/00
Inventor 林文树李祥郑淯文
Owner NORTHEAST FORESTRY UNIVERSITY
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