Method and device for remotely sensing and estimating fractions of absorbed photosynthetically active radiation of vegetation

Abstract

An embodiment of the invention provides a method and a device for remotely sensing and estimating fractions of absorbed photosynthetically active radiation of vegetation. The method includes carrying out front-end processing on original spectral curves by the aid of differential processes to obtain second-order differential curves and carrying out noise elimination preprocessing on the original spectral curves by the aid of the second-order differential curves; carrying out envelope curve removal processing on the spectral curves after noise elimination preprocessing is carried out on the spectral curves so as to obtain spectral curves without envelope curves; identifying characteristic absorption peaks by the aid of the spectral curves without the envelope curves and extracting spectral absorption indexes SAI of the characteristic absorption peaks; acquiring novel vegetation indexes integrated with visible light-near infrared hyper-spectral absorption characteristics according to the SAI of the characteristic absorption peaks so as to remotely sense and estimate the fractions of absorbed photosynthetically active radiation FAPAR of the vegetation. According to the technical scheme, the method and the device have the advantages that the novel vegetation indexes integrated with the visible light-near infrared hyper-spectral absorption characteristics are created, accordingly, the overall estimation accuracy of conventional visible light-near infrared vegetation indexes can be improved, and the remote sensing and estimation accuracy of the fractions of absorbed photosynthetically active radiation of the vegetation can be improved.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a remote sensing estimation method and device for photosynthetically active radiation absorption rate (FAPAR) of vegetation. Background technique [0002] The vegetation index, which is composed of the reflectance of visible light and near-infrared bands, is widely used in the remote sensing estimation of vegetation photosynthetically active radiation absorptivity because the visible and near-infrared bands have outstanding responses to vegetation light energy radiation. The overall accuracy of these vegetation indexes to estimate FAPAR is affected to varying degrees by the soil background (when the vegetation coverage is low, the vegetation coverage uniformity is poor, and the soil interferes greatly with the spectrum) or saturation phenomenon (these vegetation indexes are in the form of " The band combination at the position of "red band absorption peak" and "red edge" i...

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Problems solved by technology

[0002] The vegetation index, which is composed of the reflectance of visible light and near-infrared bands, is widely used in the remote sensing estimation of vegetation photosynthetically active radiation absorptivity because the visible and near-infrared bands have outstanding responses to vegetation light energy radiation. The overall accuracy of these vegetation indexes to estimate FAPAR is affected to varying degrees by the soil background (when the vegetation coverage is low, the vegetation coverage uniformity is poor, and the soil interferes greatly with the spectrum) or saturation phenomenon (these vegetation indexes are expressed in the form of " The band combination of "red band absorption peak" and "red edge" position is the most common, and the reflectivity of the peak point of "red band absorption peak" tends to be saturated when the vegetation coverage is high, and the sensitivity to FAPAR is weak)

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