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Rapid city extraction method and rapid city extraction device

An extraction method and urban technology, applied in the fields of instruments, character and pattern recognition, computer parts, etc., can solve the problem of low accuracy in urban areas, solve the problem of urban over-extraction, save time and energy, and efficiently process data. Effect

Inactive Publication Date: 2015-08-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0005] This patent aims at the two main problems in the urban area extraction and analysis method, and proposes a rapid urban extraction method and device, which is suitable for quickly completing the extraction of urban areas from any ground objects, and completes the urban and bare soil, water bodies, and vegetation The rapid distinction of other ground objects also avoids the influence of the light overflow problem, thus solving the problem of low accuracy in extracting urban areas by existing technologies

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  • Rapid city extraction method and rapid city extraction device

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Embodiment Construction

[0028] In order to solve the technical problem of low accuracy in extracting urban areas in the prior art, an embodiment of the present invention provides a method for quickly extracting cities. The general idea is as follows:

[0029]The present invention proposes a normalized difference urban area index, which is suitable for quickly completing the extraction of urban areas from any ground features, and completes the rapid distinction between cities and bare soil, water bodies, vegetation and other ground features, and also avoids light overflow impact of the problem. By establishing the normalized difference city area index (NDCAI), this method saves a lot of time and energy when extracting cities, and realizes the one-time extraction of cities and global cities. It has the advantages of "high accuracy, fast speed, and simplicity", and has a strong practicability and promotion.

[0030] In order to make the purpose, technical solutions and advantages of the embodiments of ...

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Abstract

The invention relates to the field of remote sensing to-earth observation, and specifically relates to a rapid city extraction method and a rapid city extraction device. The rapid city extraction method disclosed by the invention comprises the following steps: determining the normalized difference vegetation index NDVI of a monitoring area; determining the normalized night light image OLSnor of the monitoring area; performing calculation based on the normalized difference vegetation index NDVI and the normalized night light image OLSnor to obtain the normalized difference city area index NDCAI of the monitoring area; and extracting a city area based on the normalized difference city area index NDCAI by a threshold method to get a city extraction result graph. By building the normalized difference city area index NDCAI, the technical problem that an extracted city area is not very accurate in the prior art is solved. Furthermore, a city area can be extracted accurately and rapidly.

Description

technical field [0001] The invention relates to the field of remote sensing and earth observation, in particular to a method and device for quickly extracting cities. Background technique [0002] Urbanization expansion has an important impact on regional economic development and the sustainable development of resources and environment. It is of great significance to grasp the dynamics of urbanization in a timely manner and rationally arrange the dynamics of urban spatial distribution in planning urban development in the future to avoid widening the development gap between the east and the west. [0003] Urban land area is one of the important parameters to evaluate the level of urbanization, and its expansion type shows obvious regional differences due to the combined effects of various complex factors such as regional politics, economy, culture, and history. At present, the extraction of urban land area mainly has the following two problems: ① The extraction of cities base...

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Application Information

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IPC IPC(8): G06K9/46
CPCG06V10/60
Inventor 杨晓楠田玉刚徐韵吴蔚
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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