Terrace automatic extraction method based on high-precision DEM data of unmanned aerial vehicle

Abstract

The invention discloses an unmanned aerial vehicle high-precision DEM data-based terrace automatic extraction method, which comprises the following steps of obtaining DEM data based on an unmanned aerial vehicle aerial survey technology, calculating a terrace gradient on the basis of the DEM data, and forming a gradient digital ground model according to an obtained gradient calculation result; extracting a gradient maximum value area based on the gradient digital ground model, wherein the terrace line is located in the gradient maximum value area; and obtaining a final terrace extraction result: extracting the positive terrain from the whole experimental area, taking the extraction result as a mask layer to extract a maximum value in the gradient digital ground model, carrying out mask filtering on the maximum value extraction result, and eliminating a non-terrace area to obtain the final terrace extraction result. According to the method, the gradient calculation result based on the high-precision DEM of the unmanned aerial vehicle is used for extracting the terrace microtopographic features, the complete and continuous terrace ridge features can be rapidly and accurately extracted, and a reliable and important basis is provided for research on water and soil conservation, agricultural development, ecological environment management and the like.

Description

technical field [0001] The invention relates to the technical field of automatic extraction of terraced fields, in particular to an automatic extraction method of terraced fields based on high-precision DEM data of a drone. Background technique [0002] Terraced fields are an important artificial landform with a long history. According to written records, it can be traced back to the Qin and Han Dynasties. It plays an important role in the history of human farming civilization. my country's terraced fields are mainly distributed in the Loess Plateau region and the southwestern hilly region, which are areas with serious soil erosion. In these areas, large-scale terraced fields can change the surface shape, slow down the slope, shorten the slope length, change the process of water erosion, and effectively control soil erosion. At the same time, it can effectively intercept and store rainwater, and make full use of it, so that the problem of agricultural water shortage can be...

AI Technical Summary

Problems solved by technology

Due to the limitation of the accuracy of DEM data in the past, it is often difficult to express the ridge line of terraced fields in coarse-resolution DEM data

Therefore, the slope extraction results based on this DEM are difficult to be used to extract terraces in previous studies

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