Lake water area information extraction method based on Landsat OLI multispectral image

Abstract

The invention discloses a lake water area information extraction method based on Landsat OLI multispectral image, and the method comprises the following steps: 1) preprocessing including calibration, geometric correction, atmospheric correction, clipping and embedding is performed on Landsat OLI multispectral data; 2) the preprocessed multispectral data is divided by adopting a multiscale image segmentation method; 3) two user-defined normalized difference water body indexes and MNDWI (Modified Normalized Difference Water Index) are constructed; 4) threshold values are separately set for three normalized difference water body indexes, and water area information is extracted; 5) series water area objects are exported, and water area vector data is generated; 6) the Landsat OLI multispectral image is cut by using the water area vector data, and the water area information data is obtained. According to the invention, the first and second waveband information of the Landsat OLI is comprehensively utilized, the water area information extraction speed and precision are improved, and essential data is provided for following scientific research.

Description

technical field [0001] The invention belongs to the intersecting field of remote sensing image processing technology, geographic information system technology and lake environment protection technology, and in particular relates to a method for extracting lake water area information based on Landsat OLI multi-spectral images. Background technique [0002] There are various types of ground features and complex spatial distribution in the coastal areas of lakes, and most of the pixels are mixed pixels. Traditional lake water extraction methods are mostly based on pixel classification and extraction, which is prone to produce small classified patches and "salt and pepper" phenomena, and Misclassification and omission of classification are prone to occur, and post-classification processing will consume a lot of manpower and time. [0003] Landsat OLI remote sensing imagery is the imaging data of the sensor carried by the latest Landsat8 satellite, which has been widely used for ...

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Problems solved by technology

[0004] In order to improve the accuracy and efficiency of classification and extraction of lake waters, and overcome the shortcomings of the existing lake waters extraction, such as insufficient distinction between water information and non-water information, cumbersome post-classification processing, and heavy workload, the present invention designs a multi-spectral image based on LandsatOLI The lake water information extraction method uses multi-scale image segmentation, combined with the comprehensive use of the first, second and sixth bands of Landsat OLI, to improve the speed and accuracy of lake water information extraction, provide basic data for subsequent scientific research, and simplify the classification work steps

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