Method for measuring tree canopy height through satellite remote sensing

Abstract

The invention discloses a method for measuring the tree canopy height through satellite remote sensing, wherein the method has the advantages of being wide in coverage range, short in data obtaining period and low in data obtaining cost. The method is realized through the following calculation scheme: extracting target forest regions in different directions from an overlapping region in acquired satellite three-dimensional relative image data by adopting a deep neural network model and an object-oriented remote sensing image classification technology; obtaining satellite stereo relative image data and a ground control point file of a target forest area according to the satellite stereo relative image data and the target forest area extracted by superposing an RPB file and the ground control point file; calculating canopy structure characteristic parameters of the target forest area, and generating a digital surface model DSM and a digital elevation model DEM of the target forest area; and in combination with image calculation of raster data, subtracting the obtained digital elevation model from the obtained digital surface model to obtain a canopy height DHM, and calculating the tree canopy height from a three-dimensional angle to realize measurement of the tree canopy height.

Description

technical field [0001] The invention relates to the related technical fields of satellite remote sensing forest ecology, hydrology and biophysics, and in particular to a tree canopy height measurement method based on satellite remote sensing data. Background technique [0002] Vegetation is the most important part of terrestrial ecosystems. Tree measurement plays an important role in urban construction, urban greening, hidden danger monitoring of power transmission lines, and protection of precious trees. has a major effect. The measurement of tree shape and size is an important part of tree measurement, mainly including the measurement of tree height, diameter at breast height and crown width. Tree height refers to the height difference between the highest point of the tree crown and the ground where the root of the tree is located, that is, the distance from the reference point to the reference plane where the highest point is located, that is, the height. The traditiona...

AI Technical Summary

Problems solved by technology

When using total station measurement, the conditions of visibility are demanding, and the workload will be multiplied accordingly.

While the 3D laser scanner is widely used, there are still certain limitations, such as the high price of the instrument, mutual occlusion when used in tree scanning, etc., which limit the application in forestry

However, this method has not been reported

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