A vegetation coverage extraction method and system

A technology of vegetation coverage and extraction method, which is applied in the field of vegetation coverage extraction method and system, can solve the problems of affecting vegetation coverage and failing to maintain camera stability, and achieve the effect of ensuring stability and improving extraction accuracy

Inactive Publication Date: 2019-04-05
NORTHEASTERN UNIV
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  • Claims
  • Application Information

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Problems solved by technology

When using the photographic method to obtain ground data, it is necessary to ensure that the camera is kept at a certain height from the ground and taken horizontally and vertically. Generally, the shooting height of the hand-held camera is not enough, but the stability of the camera cannot be maintained by using a long pole to pick up the camera. If the sample quadrat obtained by the photographic method The size cannot match the spatial resolution of remote sensing data, which will affect the accuracy of remote sensing technology in estimating vegetation coverage

Method used

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  • A vegetation coverage extraction method and system
  • A vegetation coverage extraction method and system
  • A vegetation coverage extraction method and system

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Embodiment 1

[0049] figure 1 It is a method flowchart of an embodiment of the vegetation coverage extraction method of the present invention.

[0050] see figure 1 , the vegetation coverage extraction method includes:

[0051] Step 101: Acquiring aerial images captured by the on-board digital camera when the drone is flying at a preset altitude. As a specific implementation manner, the quadrat size of the aerial image taken by the digital camera is 60m×60m. The UAV flies about 100m above the sample quadrat to obtain the UAV aerial photography remote sensing data. The geographic coordinates of each plot were recorded using GPS.

[0052] Taking the Hulunbuir Grassland in Inner Mongolia as an example, the vegetation types and growth conditions in this area are diverse, and the underlying surface is relatively complex. Vegetation coverage is high.

[0053] figure 2It is the layout map of quadrats during the image collection of Hulunbuir Grassland in Inner Mongolia according to the embo...

Embodiment 2

[0141] Figure 5 It is a system structure diagram of an embodiment of the vegetation coverage extraction system of the present invention.

[0142] see Figure 5 , the vegetation coverage extraction system includes:

[0143] The image acquisition module 201 is used to acquire aerial images captured by the on-board digital camera when the drone is flying at a preset altitude.

[0144] The denoising module 202 is configured to perform denoising processing on the aerial image.

[0145] The denoising module 202 specifically includes:

[0146] The impulse noise filtering unit is used to eliminate the impulse noise in the aerial image by using the switch median filtering method; the Gaussian noise filtering unit is used to eliminate the Gaussian noise in the aerial image by using the wavelet transform method based on Wiener filtering .

[0147] The image enhancement module 203 is configured to perform image enhancement processing on the aerial image after noise removal.

[0148...

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Abstract

The invention discloses a vegetation coverage extraction method and system. The method comprises the steps of obtaining an aerial image collected by an unmanned aerial vehicle; De-noising processing is carried out on the aerial image; Carrying out image enhancement processing on the aerial image after noise removal; Calculating a vegetation index of the aerial image after image enhancement processing to obtain a vegetation index image; And taking the discrimination function of the information entropy of each surface feature category as a fitness function, and segmenting the vegetation type image from the vegetation index image by using a genetic algorithm, thereby obtaining the vegetation coverage. According to the vegetation coverage extraction method and system, the stability of image shooting and the precision of vegetation coverage extraction can be improved.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a method and system for extracting vegetation coverage. Background technique [0002] Fractional Vegetation Cover (FVC) is the percentage of the vertical projected area of ​​vegetation on the ground to the total area of ​​the study area, which can represent the denseness of vegetation and the size of the photosynthetic area of ​​plants. It is an important parameter of various plant growth dynamics, and is also an important factor in meteorological numerical models and hydrological ecological models. [0003] At present, due to the limitations of manpower, material resources, and financial resources, the traditional ground-based measurement of vegetation coverage is difficult to provide the structure and distribution of vegetation coverage in large-scale areas. Remote sensing technology can obtain large-scale data and can observe periodically, and because of its spatial re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06T7/11G06T7/136G06T7/62G06T7/90
CPCG06T7/11G06T7/136G06T7/62G06T7/90G06T2207/30188G06T2207/10032G06V20/188
Inventor 包妮沙刘艳慧蔡宗磊刘小翠孙瑞王思琢
Owner NORTHEASTERN UNIV
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