Method of combining satellite and sites for observation and retrieval of space-time continuous PM2.5 concentration

A PM2.5 and inversion technology, applied in the field of remote sensing image processing and information application, can solve problems such as time discontinuity, and achieve the effect of continuous PM2.5 monitoring and accurate recovery results

Active Publication Date: 2016-04-20
WUHAN UNIV
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Problems solved by technology

It only retrieves the PM2.5 data at certain specific moments, while ignoring the problem of time discontinuity

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  • Method of combining satellite and sites for observation and retrieval of space-time continuous PM2.5 concentration
  • Method of combining satellite and sites for observation and retrieval of space-time continuous PM2.5 concentration
  • Method of combining satellite and sites for observation and retrieval of space-time continuous PM2.5 concentration

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Embodiment Construction

[0027] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0028] The lack of satellite data leads to spatial gaps in the retrieved PM2.5 concentration data. The missing PM2.5 data can be reconstructed by using the satellite retrieval and ground station interpolation PM2.5 data at the reference time with good data, and the ground station interpolation results at the time to be repaired, so as to achieve time continuity.

[0029] please see figure 1 , a kind of method provided by the present invention combines satellite and site observation to retrieve the method of space-time continuous PM2.5 concentration, comprise...

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Abstract

The invention discloses a method of combining a satellite and sites for observation and retrieval of the space-time continuous PM2.5 concentration. Firstly, PM2.5 data of ground sites is subjected to spatial interpolation, and the change rule of each position in time is obtained; then by means of satellite retrieval PM2.5 data in reference time and the change trend of the site interpolation result in the corresponding time period, the estimated value of time under repair is reestablished; finally a regression relation between the un-missing zone of the time under repair and the estimated value of the corresponding position is constructed, the estimated value of the missing zone is corrected based on the regression relation, and the final recovery value is obtained. According to the invention, the time change rule and relation of multi-source data is considered, space-time continuous PM2.5 concentration data can be obtained through reconstruction, and the observation of the ground sites is utilized furthest, The method of combining the satellite and the sites for observation and retrieval of the space-time continuous PM2.5 concentration is high in accuracy and calculating efficiency, easy to implement, strong in extendibility, and high in practical value.

Description

technical field [0001] The invention belongs to the field of remote sensing image processing and information application, and relates to a method for obtaining PM2.5 concentration, in particular to a method for inverting time-space continuous PM2.5 concentration by combining satellite and site observation. Background technique [0002] In the monitoring of atmospheric PM2.5 pollution, ground stations have high precision and strong stability, but the density is low and the coverage area is small, making comprehensive monitoring and analysis impossible. Remote sensing satellites can provide aerosol observation data (AOD) with a wide coverage. After establishing the relationship with ground station PM2.5 data (AOD-PM2.5), the spatial distribution data of PM2.5 can be retrieved from satellite observations. However, due to factors such as clouds, AOD data are often degraded or missing, which makes it impossible for satellites to retrieve time-continuous PM2.5 data at the same loc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 沈焕锋李同文
Owner WUHAN UNIV
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