Method for measuring and calculating overground biomass of plant

Abstract

The invention relates to a method for measuring and calculating overground biomass of a plant. The method comprises the following steps: S1, acquiring visible light image data and ground measured vegetation aboveground biomass; S2, establishing a three-dimensional realistic picture; S3, extracting a ground object elevation map and a ground object distribution map from the three-dimensional realistic picture, and obtaining geographic position information of the two maps to be consistent; S4, dividing the ground object distribution map into vegetation and non-vegetation distribution map areas, and calculating spectral indexes and texture characteristic quantities of visible light of the vegetation distribution map areas; extracting a corresponding non-vegetation elevation map area from the ground object elevation map; S5, performing data interpolation on a blank area in the non-vegetation elevation map area to obtain a ground elevation map; S6, subtracting the ground object elevation maps in S3 and S5 to obtain vegetation height data distribution; S7, acquiring canopy height data of vegetation, and performing regional statistics on spectral indexes, texture characteristic quantities,canopy heights and the like of visible light to obtain related characteristic quantities; and S8, screening the characteristic quantity, and calculating the vegetation aboveground biomass by combining with the actually measured vegetation aboveground biomass on the ground.

Description

technical field [0001] The invention relates to a method for measuring and calculating the aboveground biomass of plants. Background technique [0002] Terrestrial plant biomass is a very important indicator for the study of ecosystem energy changes and carbon storage changes, so it is very meaningful to measure it accurately. Plant biomass is divided into above-ground biomass and underground biomass. Above-ground biomass refers to the dry weight of plants above the surface per unit area. At present, the main methods for its calculation are ground measurement and remote sensing estimation. Among them, although the ground measurement method has high precision and reliable results, it is time-consuming and laborious, suitable for small scale, and destructive to plants. The remote sensing estimation method mainly relies on satellite remote sensing images and ground measured biomass data, builds biomass models through regression statistics or machine learning algorithms, and th...

AI Technical Summary

Problems solved by technology

Among them, although the ground measurement method has high precision and reliable results, it is time-consuming and laborious, suitable for small scale, and destructive to plants

The remote sensing estimation method mainly relies on satellite remote sensing images and ground measured biomass data, builds biomass models through regression statistics or machine learning algorithms, and then realizes a wide range of biomass estimation and dynamic analysis, but its estimation accuracy is low, and Large spatial variability

[0003] In recent years, the rapid development of UAV remote sensing has produced a method to measure and calculate aboveground biomass using UAV remote sensing images. The measurement method and device, which use UAV remote sensing images to a certain extent solve the problems of time-consuming and labor-intensive ground measurement and poor remote sensing estimation accuracy, but in practice, there are still high cost of remote sensing devices, poor estimation accuracy and method stability Low-level problems, such as the high cost of sensors to obtain remote sensing images, which are difficult to achieve with low-cost ordinary visible light cameras. In addition, the type and variable selection of aboveground biomass calculation models may not be optimal, so its measurement accuracy needs to be further improved

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