Method and device for measuring spatial distribution of crop plant heights through unmanned plane remote sensing

Abstract

The invention provides a method and device for measuring the spatial distribution of crop plant heights through unmanned plane remote sensing, and the method comprises the steps: obtaining an image sequence, collected by an airborne image sensor of an unmanned plane, of a target region; obtaining the POS information of photographing positions of all images in the image sequence; building a conversion relation between the image plane coordinates and physical coordinates according to the POS information; respectively building a DSM (digital surface model), comprising crop canopy information, of a crop coverage region in the target region and a BSM (basic surface model), corresponding to the bottom of crops, of the target region according to the image sequence and the conversion relation; and obtaining the spatial distribution of the crop plant heights in the target region according to the DSM and BSM. The method can obtain the large-area crop plant heights of a crop region under the condition of complex farmlands through employing the flexible maneuvering characteristics of unmanned plane remote sensing, and can solve problems that manual observation takes points as a plane, consumes a large amount of manpower and a large number of material resources, is severely affected by the subjectivity of a person, and is not consistent in data precision.

Description

technical field [0001] The invention relates to the technical field of UAV remote sensing measurement and image processing, in particular to a method and device for UAV remote sensing measurement of crop height spatial distribution. Background technique [0002] Crop height is an important agronomic parameter that characterizes different crop varieties. In field agricultural production, the difference in plant height of the same crop variety will directly affect the final yield. The main reason is that plant height is closely related to crop aboveground biomass, and aboveground biomass is related to yield, so plant height is usually an important agronomic parameter to measure crop growth. In addition, when floods and wind disasters occur in farmland crops, there will be a large number of crops lodging, and the lodging degree and spatial distribution are complex, so it is difficult to observe all the lodging in place through manual observation when carrying out lodging invest...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides a method and device for measuring the spatial distribution of crop height by remote sensing of UAV, which uses the maneuverability and flexibility of UAV remote sensing to obtain the space of plant height in crop coverage areas under large-scale and complex farmland conditions. The distribution can solve the problems of substituting point for surface for manual observation, consuming a lot of manpower and material resources, being greatly influenced by human subjectivity, and inconsistent data accuracy. Improve the accuracy and consistency of plant height extraction

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