City ground impermeability degree analyzing and drawing method

Abstract

The invention discloses an analyzing and charting method of urban land water impermeability degree, which comprises the following steps: a chosen urban multispectral remote sensing image is segmented for the first time, object-oriented classification is carried out on image object layer which is produced, and classification-based fusion is performed on the classified layer, thereby obtaining image object layer in urban and non-urban distributing areas (S110); the remote sensing image is segmented for the second time to obtain an image object layer which indicates absolute construction unit of fully impermeable urban land, and object-oriented classification is carried out on the image object layer (S120); the remote sensing image is segmented for the third time to obtain an image object layer which indicates different land parcels in urban area, and object-oriented classification is carried out on the image object layer with combination of characteristic information of the first and the second classification of the segmented image object layer (S130); after the image object layer segmented for the third time is classified, a result picture is output, thereby obtaining a result picture that urban land parcels are classified by water impermeability degree (S140).

Description

technical field [0001] The invention relates to a method for analyzing and drawing the degree of water impermeability of urban ground, which belongs to the application fields of urban development planning, urban surveying and mapping, and urban remote sensing technology. Background technique [0002] It is well known that the analysis and mapping of urban ground imperviousness is extremely important for understanding the development of urban areas, formulating future urban planning, and evaluating the environmental quality and living suitability of urban areas. Currently, two methods are used for mapping the degree of imperviousness of the urban ground. One is the method of remote sensing visual interpretation mapping. This method first determines the scope of the urban area to be analyzed, and then classifies and outlines various urban impermeable surfaces in the urban area, such as roads, buildings, parking lots, etc., as well as water permeability. Ground, such as grassl...

AI Technical Summary

Problems solved by technology

This method is mainly based on manual visual interpretation, which is time-consuming, labor-intensive, costly, and inefficient

The other is the pixel-based remote sensing image classification method. Due to the complex structure of the urban area, the same object with different spectra, different objects with the same spectrum, mutual occlusion and shadow effects, and the adverse effects of the "salt and pepper" effect commonly found in pixel-based classification methods, this method The method has little practical application

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