A Method of Extracting Leaf Area Index and Average Leaf Incline Angle Using Vegetation Canopy Shade

A technology of leaf area index and vegetation canopy, applied in the direction of using optical devices, measuring devices, instruments, etc., to reduce complexity, improve ease of use, and reduce experimental costs

Active Publication Date: 2017-01-25
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

In the present invention, it is difficult to obtain LAI and θ at the same time in the current canopy analysis process L A method for simultaneously extracting leaf area index and average leaf inclination angle using vegetation canopy shadow

Method used

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  • A Method of Extracting Leaf Area Index and Average Leaf Incline Angle Using Vegetation Canopy Shade
  • A Method of Extracting Leaf Area Index and Average Leaf Incline Angle Using Vegetation Canopy Shade
  • A Method of Extracting Leaf Area Index and Average Leaf Incline Angle Using Vegetation Canopy Shade

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Experimental program
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Effect test

example

[0073] Example: Automatic extraction experiment of holly vegetation structure parameters in Beijing Normal University Biological Park

[0074] Measurement date: March 17, 2014

[0075] Measurement time: 10:00 am to 16:00 pm

[0076] Measurement interval: 30 minutes

[0077] Vegetation Type: Holly

[0078] Data acquisition situation:

[0079] According to the experimental settings, 12 photos of the experimental site were obtained. Since the sun was blocked by clouds and haze during some periods of the day, 6 photos with canopy shadows were obtained (the shooting time was: 12:02 , 13:33, 14:04, 14:34, 15:05, 15:35).

[0080] For the above 6 images (Appendix 1), perform image processing according to the steps (1)-(8) above, and input the latitude and longitude coordinates of the experimental site: east longitude 116.36°, north latitude 39.96°. The corresponding relationship between the calculated sun altitude angle and the shooting time is shown in Table 1.

[0081] Table 1...

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Abstract

Provided is a method for extracting leaf area index and mean foliage inclination angle by utilizing plant canopy shadow. The method is formed by two parts: canopy shadow automatic extraction technology and a canopy projection analysis method. The canopy shadow automatic extraction technology is characterized by automatically extracting shadow-in-picture proportion, which is called shadow proportion, from a plant canopy picture, and the part is specifically realized through eight steps. The canopy projection analysis method is characterized by obtaining the canopy leaf area index and the mean foliage inclination angle by utilizing the output results of the canopy shadow automatic extraction technology, that is, shadow proportions, extracted from the pictures at different time which is corresponding to a plurality of sun incidence height angles respectively, as input parameters, and the part is specifically realized through five steps. The method can realize automatic acquisition of structure parameters of plant canopy leaf area index and the mean foliage inclination angle and the like by utilizing the plant canopy shadow information extracted from common digital pictures; and the method has the advantages of simple classification method and high automation degree in the canopy analysis process.

Description

technical field [0001] The invention relates to a method for extracting leaf area index and average leaf inclination angle by utilizing vegetation canopy shadow, which is related to digital image processing and vegetation canopy analysis, and belongs to the technical field of agriculture and ecology. Background technique [0002] Vegetation leaf area index (Leaf Area Index: LAI) and average leaf inclination angle (θ L ) belong to the structural information of vegetation, and they are important factors affecting the redistribution of solar radiation in the canopy. Therefore, obtaining LAI and θ L It is of great significance to study the ability of vegetation to utilize solar incident energy and the growth and development status of vegetation. [0003] Extracting LAI and θ from digital images L It is a commonly used canopy analysis measurement method. According to the field of view of the imaging lens used by the measuring instrument, it can be subdivided into conventional...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/28G01B11/26
Inventor 屈永华付立哲焦思红
Owner BEIJING NORMAL UNIVERSITY
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