Close-range ordinery digital camera tree metering method

A digital camera, an ordinary technology, applied in the field of forest measurement, can solve the problems of high cost, low efficiency, low precision, etc., and achieve the effect of short measurement period, small workload and high precision

Inactive Publication Date: 2007-08-22
BEIJING FORESTRY UNIVERSITY
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Problems solved by technology

[0003] ① Field surveys use manual visual estimation or simple tools to obtain data, with low precision, slow action during actual measurement, and long cycle
[0004] ②In-house data processing is carried out manually, and the workload of calculation and statistics is relatively large, which requires a lot of manual input, high cost and low efficiency
[0005] Therefore, in the process of continuous inventory of national forest resources, when the traditional survey method of each tree is combined with aerial remote sensing to survey the sample plot, it will inevitably bring a lot of trouble and the accuracy is not high and the efficiency is low.

Method used

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specific Embodiment approach

[0014] The close-range method of ordinary digital camera tree measurement is different from the existing method, and has been greatly improved. Specifically: use ordinary digital camera as a tool, take photos of fixed plots, and use the method of restoring the three-dimensional space of trees to establish a model to process the image points of the same name , through the method of fitting the local surface equation, the coordinates of any point are interpolated, and the tree measurement factors such as diameter at breast height, diameter at any place, tree height, and tree crown volume are calculated. The specific implementation is as follows:

[0015] 1. Select at least 5 obvious signs in the field of view of the camera, and measure the three-dimensional coordinates of their centers. The coordinates of the image points are obtained from the computer through digital images, and the coordinates of the image points are connected with the ground coordinates of the target point thr...

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Abstract

The invention discloses a tree survey method by using a close-range common digital camera. Take the common digital camera to shoot fixed sample plot. Modeling to deal with homonomial image points by renewing tree three-space and interpolating arbitrary point coordinate by fitting part curvilinear equation. To calculate tree survey factors including diameter height, any diameter, tree height and crown capacity etc. Making the best of handiness and flexibility of digital camera can shorten measured cycle. Dealing with data by computer modeling and calculating various tree survey factors by using characteristic point coordinates of the renewed tree three-space can largely improve the precision and work efficiency of forest resources investigation, which can reduce the cost greatly.

Description

1. Technical field [0001] The invention relates to a forest measurement method in forest resources survey, in particular to a tree measurement method with a close-range common digital camera. 2. Technical Background [0002] The traditional continuous inventory of national forest resources usually uses the survey method of each tree combined with aerial remote sensing to survey plots to obtain basic tree measurement factors, but the above-mentioned techniques have their obvious shortcomings and deficiencies: [0003] ① Field surveys use manual visual estimation or simple tools to obtain data, with low accuracy, slow action and long cycle during actual measurement. [0004] ②In-house data processing is carried out manually, and the workload of calculation and statistics is relatively large, which requires a lot of manual input, high cost and low efficiency. [0005] Therefore, in the process of continuous inventory of national forest resources, when the traditional per-tree ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00G01B11/02G01B11/03G01B11/08G01B21/02G01B21/04G01B21/10G01C11/00
Inventor 冯仲科姚山
Owner BEIJING FORESTRY UNIVERSITY
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