Automatic extraction method of loess shallow ditch based on high-resolution remote sensing image and dem

Abstract

The invention discloses an automatic extraction method of loess shallow ditch based on high-resolution remote sensing images and DEM. First, edge detection is performed on the high-resolution image of the shallow ditch slope to obtain the edge image of the shallow ditch; secondly, the shallow ditch slope is The flow direction of the DEM is judged and re-encoded to generate a flow direction raster; again, the edge image is directional detected according to the flow direction, starting from each edge pixel of the edge image, and checking whether the next pixel is an edge pixel along the flow direction , if it is, then connect and repeat the check of the previous step, if not, the detection is terminated; finally, use an appropriate threshold value to eliminate the pseudo shallow groove information and the grid conversion line in the result of the previous step, that is, obtain the shallow loess area of ​​the extracted area. ditch. The invention provides an automatic loess shallow ditch extraction method, which saves manpower and material resources for field investigations, and can provide richer and more convenient basic data for soil and water conservation monitoring and land resource investigations.

Description

technical field [0001] The invention belongs to water and soil conservation and land resources monitoring technology, in particular to an automatic extraction method of loess shallow ditch based on high-resolution remote sensing image and DEM. Background technique [0002] Shallow gullies are a relatively common micro-geomorphological phenomenon in the hilly and gully regions of the Loess Plateau. When rainfall occurs, gullies are generated due to the collection of slope runoff caused by terrain undulations. As the runoff continues to collect, its erosive capacity increases, and the erosion of the gully increases. The depth and width of the ditch gradually expand and develop, forming rills. It is a unique landform with vertical and horizontal gullies, such as shallow gullies, cut gullies, gullies, dry ditches and river ditches. Loess shallow gully, as a transition type from rill to cut gully, has special significance in gully erosion systems, and its potential harm is extre...

AI Technical Summary

Problems solved by technology

Due to the complexity of the topography of the loess, it is difficult to obtain large-scale shallow trenches by field measurement

Using remote sensing images to visually interpret the characteristic information of shallow trenches, the data collection operation is complex and inefficient, and the accuracy of the collected data is greatly affected by human factors

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