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Water body information extraction method

An extraction method and water body information technology, which is applied in the direction of instruments, character and pattern recognition, computer components, etc., can solve problems such as large adaptive threshold, inapplicability, unbalanced proportion of water body pixels and non-water body pixels, etc. , to achieve the effect of flexible extraction threshold and high-precision extraction

Inactive Publication Date: 2021-02-02
CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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Problems solved by technology

Among them, the maximum between-class variance algorithm (OTSU algorithm) is the most common. This method has the advantages of being simple and fast. However, the main problem of this method is that the proportion of water body pixels and non-water body pixels is unbalanced, and the adaptive threshold is too large, which is not feasible. Suitable for water bodies with obvious wet and dry seasons

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Embodiment 1

[0033] A water body information extraction method, including water body satellite image acquisition and preprocessing and water body extraction two parts:

[0034] 1. Acquisition and preprocessing of satellite images of water bodies:

[0035] 1. Data download

[0036] Select Landsat8 data and download the original Landsat8 image of the study area from the website Geospatial Data Cloud, the website is as follows: (http: / / www.gscloud.cn / sources / index?pid=1&type=1).

[0037] 2. Data preprocessing

[0038] (1) Radiation calibration: using ENVI software;

[0039] (2) Atmospheric correction: use the FLAASH atmospheric correction tool;

[0040] (3) Clipping: Use the vector file (shp) of the study area to clip the preprocessed landsat8 satellite image.

[0041] 2. Water body extraction includes the following steps:

[0042] Step 1: Carry out band calculation on the satellite image to obtain the water body index of each pixel;

[0043] Use the band math tool in the ENVI software ...

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Abstract

The invention discloses a water body information extraction method, which comprises two parts of acquisition and preprocessing of a water body satellite image and water body extraction, and the waterbody extraction comprises the following steps: carrying out waveband calculation on the satellite image to obtain a water body index of each pixel point; clustering pixels through the water body indexvalue by using a mean shift algorithm; and comparing the water body index value of the clustering center with a given threshold value and judging whether the whole category is a water body or not. The method provided by the invention is used for water body extraction and has relatively high precision. The extraction threshold value is flexible, stable and rapid, and high-precision extraction of the water body, especially the water body covered by cloud and mist, can be realized by adjusting the clustering radius under different conditions.

Description

technical field [0001] The invention relates to a water body information extraction method, which belongs to the technical field of water ecological protection, and in particular to the water body information extraction technology. Background technique [0002] Water body information extraction is an important part of ecological protection work, such as water ecological monitoring, water resource investigation and planning, water conservancy project planning, etc. Satellite remote sensing is playing an increasingly important role in many fields such as environmental monitoring, flood control and disaster reduction, and ecological protection due to its advantages such as wide monitoring range, large amount of information, and fast acquisition speed. The water body index method is an important method to extract water body information by using satellite remote sensing. Using the water body index method to extract water body information, the selection of the threshold is very i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/42G06K9/46G06K9/62
CPCG06V20/182G06V10/32G06V10/40G06F18/23
Inventor 宋文龙杨昆刘宏洁唐锐程瓦段媛媛曲伟卢奕竹余琅
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES