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Method for monitoring nitrogen concentration of vegetation canopies in wetland based on hyperspectral vegetation index

A wetland vegetation and vegetation index technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem of reducing the estimation accuracy of nitrogen concentration, and achieve the effect of reducing the impact of estimation accuracy and high precision

Inactive Publication Date: 2014-06-18
LIAONING NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

Multiple scattering signals from the complex background of wetland vegetation can significantly reduce the estimation accuracy of nitrogen concentration

Method used

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  • Method for monitoring nitrogen concentration of vegetation canopies in wetland based on hyperspectral vegetation index
  • Method for monitoring nitrogen concentration of vegetation canopies in wetland based on hyperspectral vegetation index
  • Method for monitoring nitrogen concentration of vegetation canopies in wetland based on hyperspectral vegetation index

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Experimental program
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Embodiment Construction

[0029] 1. Wetland vegetation canopy spectrum, leaf area index (LAI) and nitrogen concentration measurement

[0030] The experimental measurement time should match the Hyperion hyperspectral remote sensing image acquisition time as much as possible.

[0031] ① Spectral measurement of wetland vegetation.

[0032] ASD portable spectrometer (wavelength range 350-2500nm, measurement field angle 25°) was used to measure the spectral reflectance of wetland vegetation. The measurement time is selected from 9:00-15:00h when the weather is clear and the wind speed is small. The canopy spectrum measurement was carried out at 1m above the top of the wetland vegetation canopy (observation radius is 22.2cm, area is 1548cm 2 ), the reference plate used in the experiment is 99% Lambertian white plate. For each sample, 10 uniformly distributed sampling points were selected, each sampling point was measured 10 times, and the average value was taken to eliminate accidental errors.

[0033] ②...

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Abstract

The invention discloses a method for monitoring the nitrogen concentration of vegetation canopies in a wetland based on a hyperspectral vegetation index. The method comprises the steps of measuring the spectrum, the leaf area index (LAI) and the nitrogen concentration of the vegetation canopies in the wetland; preprocessing a Hyperion hyperspectral remotely sensed image; improving an SAVI (soil adjusted vegetation index) to obtain an SAVI1510; constructing a hyperspectral vegetarian index NDNI / SAVI1510 applied to monitoring on the nitrogen concentration of vegetation canopies in the wetland, wherein the hyperspectral vegetarian index NDNI / SAVI1510 is applied to estimation on the performance of monitoring the nitrogen concentration of vegetation canopies in the wetland; and constructing a model for monitoring the nitrogen concentration of vegetation canopies in the wetland based on the hyperspectral vegetarian index NDNI / SAVI1510. The method for monitoring the nitrogen concentration of vegetation canopies in the wetland based on the hyperspectral vegetation index comprises the beneficial effects that the influence, caused by multiple scattering signals from a complicated background from vegetations in the wetland, on the wetland vegetation canopy nitrogen concentration estimation precision is weakened, and the nitrogen concentration of the vegetation canopies in the wetland can be estimated with high precision.

Description

technical field [0001] The invention belongs to the application field of wetland vegetation remote sensing technology, in particular to a method for monitoring wetland vegetation canopy nitrogen concentration based on hyperspectral vegetation index. Background technique [0002] Wetlands are among the most productive ecosystems on Earth, as well as one of the most biodiverse. Wetlands can play an irreplaceable role in regulating flood flow, preventing natural disasters, recharging groundwater, maintaining biodiversity, regulating climate, controlling soil erosion, maintaining coastlines, and degrading environmental pollutants. Wetlands can reduce the nitrogen concentration in eutrophic water bodies through processes such as sedimentation, filtration, chemical precipitation and adsorption, microbial interaction, and vegetation absorption, and the nitrogen concentration of wetland vegetation canopy changes accordingly. Monitoring the nitrogen concentration of wetland vegetati...

Claims

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Application Information

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IPC IPC(8): G01N21/25
Inventor 王莉雯卫亚星
Owner LIAONING NORMAL UNIVERSITY
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