基于DEM的露天矿坑坡面顶底线自动提取方法研究

doi:10.11872/j.issn.1005-2518.2021.04.006

Abstract

Abstract:

The slope top and bottom line plays an important role in open-pit mine mining design， production planning，calculation of stripping volume，road network planning，etc.Traditional extraction methods require the use of total stations and other equipment to rely on manual extraction，which is inefficient.In order to solve the problem of low efficiency of the traditional method of manually extracting the slope top and bottom line from the open-pit mine 3D model，a method of automatically extracting the slope top and bottom line from the open-pit mine DEM （Digital Elevation Model） 3D model was studied.The first step of the method is to pre-process the elevation data with up-sampling and bilateral filtering.The second step is to set a threshold，then according to the different elevation values of different regions in the DEM 3D model，different regions are converted into grayscale images with different pixel values.The last step is to perform gradient operation on the gray image，extract the edge pixels in the image，combine with an improved Zhang-Suen algorithm to extract the skeleton of the edge lines，and design a search algorithm based on eight neighborhoods to order the edge pixels and connect them into a complete contour line，and use the Douglas-Peucker algorithm for thinning to get the final step line.The experiment used the measured three-dimensional model data of an open-pit mine for testing.With the aid of a three-dimensional visualization software platform，the extracted step line is superimposed with the three-dimensional model of the pit，visually analyzed and compared，and the accuracy of the extracted results is judged.The visualization results show that compared with the traditional manual extraction method，the automation method greatly improves the work efficiency under the condition of ensuring the extraction accuracy，and most importantly realizes the automation of the extraction process.This method is also applicable to the terrain features of the DEM 3D model line extraction.

Key words: digital mine, extraction of top and bottom line of open pit slope, digital elevation model, edge detection, terrain feature extraction, eight neighborhood edge tracking

CLC Number:

TD176

Tiandong SHI,Lin BI. Research on Automatic Extraction Method of Top and Bottom Line of Open-Pit Slope Based on DEM[J].Gold Science and Technology, 2021, 29(4): 612-619.

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Research on Automatic Extraction Method of Top and Bottom Line of Open-Pit Slope Based on DEM

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