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Wetland vegetation carbon sequestration rate remote sensing estimation method based on reconstructed vegetation index time sequence image

A technology of wetland vegetation and time series, which is applied in the field of remote sensing estimation, can solve problems such as limited estimation, and achieve the effects of simple operation, removal of remote sensing image errors, and low cost

Active Publication Date: 2021-06-18
HOHAI UNIV
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Problems solved by technology

However, affected by cloud interference, data transmission errors, and ditropic reflections, there are many abnormally low values ​​in the MODIS EVI time series curve of Poyang Lake wetland that do not conform to the law of vegetation growth, which seriously limits the impact on the annual carbon sequestration rate of wetland vegetation. estimate

Method used

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  • Wetland vegetation carbon sequestration rate remote sensing estimation method based on reconstructed vegetation index time sequence image
  • Wetland vegetation carbon sequestration rate remote sensing estimation method based on reconstructed vegetation index time sequence image
  • Wetland vegetation carbon sequestration rate remote sensing estimation method based on reconstructed vegetation index time sequence image

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Embodiment 1

[0048] Take Poyang Lake Wetland, a typical wetland ecosystem, as an example.

[0049] figure 2 Schematic diagram of the method for reconstructing high-quality remote sensing observation vegetation index time-series images. Based on the AQ value (Ancillary Quality value, AQ) of the generalized quality layer (Band Pixel Reliability), the pixels without data (AQ=-1), snow / ice covered pixels (AQ=2) and cloud pollution Pixels (AQ=3) are eliminated, and only high-quality pixels and medium-quality pixels with AQ values ​​of 0 and 1 in the original EVI image are retained. Fit the EVI time series curve with S-G filter to complete the interpolation to eliminate outliers. from figure 2 It can be seen from the figure that compared with the original EVI annual change curve, the reconstructed MODIS EVI time-series curve is more reasonable in describing the dynamic changes of vegetation in Poyang Lake wetland, removing many noise points, and capturing the sex-grass The two-season chara...

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Abstract

The invention discloses a wetland vegetation carbon sequestration rate remote sensing estimation method based on a reconstructed vegetation index time sequence image. The method comprises the following steps: S1, reconstructing an enhanced vegetation index (EVI) image time sequence with high space-time continuity in a wetland vegetation distribution area; S2, establishing an optimal wetland vegetation carbon stock remote sensing inversion model based on measured data and EVI observation values of corresponding pixels in the same period; S3, reconstructing the annual dynamic change process of the wetland vegetation carbon stock in combination with the optimal wetland vegetation carbon stock remote sensing inversion model and the reconstructed EVI time sequence image; and S4, calculating the annual cumulative growth amount of the carbon stock of the wetland vegetation pixel by pixel according to a cumulative stock method to obtain the annual carbon sequestration rate of the wetland vegetation. The method is suitable for a wetland ecological system with frequent cloudy and rainy weather and large water level variation, and is simple and convenient to operate and convenient to popularize and apply.

Description

technical field [0001] The invention relates to the technical field of remote sensing estimation, in particular to a method for remote sensing estimation of wetland vegetation carbon fixation rate based on reconstructed vegetation index time series images. Background technique [0002] The carbon fixed by wetland plants through photosynthesis, that is, plant biomass carbon, is the main carbon input in the process of carbon sequestration in wetland ecosystems. The carbon sequestration rate of wetland vegetation directly reflects the carbon sink status of the wetland ecosystem, and is the main factor concerned in the regulation of wetland ecological processes. In recent years, under the background of significant changes in wetland hydrological processes caused by climate change and human activities, the carbon sequestration function of wetland vegetation is facing severe challenges. Therefore, scientific estimation of the carbon sequestration rate of wetland vegetation is an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10032G06T5/80G06T5/90G06T5/70Y02A90/10
Inventor 戴雪
Owner HOHAI UNIV
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