Data for: A Novel Approach for Parameters Extraction of Ripple Marks Based on SfM

Published: 31 March 2020| Version 1 | DOI: 10.17632/b7twdy3kcm.1
Contributor:
Lu Li

Description

Fig. 1. Camera locations and image overlap. The black points represent the camera's shooting position; the coloured areas represent the overlap of the photos. Fig. 2. Take photographs converging on the feature, at multiple distances and angles. The blue area is the camera position. The black line is the normal vector of the lens position. Fig. 3. Overview of processes and products. (A) A digital image of ripple marks. (B) Low-density point cloud with 65300 points. (C) High-density point cloud. There are more than 37 million points, each point contains X, Y, Z and RGB values; (D). Georeferenced mesh model. Over 7.5 million triangular mesh faces are created. ①-④ are geotag points. (E) Digital surface model. (F) 3D digital outcrop model. Fig. 4. Using virtual compass tool in CloudCompare to quantify structures orientations, (A) shows that the attitudes of ripple, which are extracted by virtual compass tool in CloudCompare from digital outcrop model. The black wireframes are where the attitudes were extracted. (B) Dip of gentle slope statistics histogram. (C) Dip of steep slope statistics histogram. (D) Rose diagram of strike. (E) Rose diagram of dip-direction, it represents the current flow direction. The grey areas are the dip-direction of the steep slope, the white areas are the dip-direction of gentle slope. Fig. 5. Topographic profiles of ripples. (A) The digital surface model, a-b is the position of the topographic profile, a and b are the starting point and the end point respectively, and the line a-b is perpendicular to the strike of the ripples ridge; (B) the topographic profile of ripple marks generated from A to B, the red dotted lines are the projections of the false planes with the maximum dip of the steep slope and the blue dotted lines ae the projection of the false plane with the maximum dip of the gentle slope; (C) a local topographic profile of (B), a1, a2 and a3 are troughs, b1 and b2 are the crests, L1-1 and L2-1 are the projection distances of steep slopes in the horizontal direction, L1-2 and L2-2 are the projection distances of gentle slopes in the horizontal direction. L1 and L2 are the ripple wavelengths, L1= L1-1+ L1-2, L2= L2-1+ L2-2; H1 and H2 are ripple heights. (D) Ripple mean curvature calculation. M is the point where the tangent slope of the gentler slope is the largest. M´ is the point where the tangent slope of the steeper slope is the largest. Δs is the arc length between M and M´. The blue line and the red line are the tangents of M and M´ respectively. Δα is the rotation angle of the tangent lines. Table 1. Camera parameters. Table 2. Statistics results of ripple marks attitudes. Table 3. Wavelength, ripple height, RI, RSI, and mean curvature of ripple marks. The mp4 file format is a 3D animation of ripple marks, which is a supporting material.

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Geology, Sedimentology, Image Processing

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