Structure-from-Motion Reconstruction and Reference Microscopy of Severely Eroded Blade

Published: 02-12-2020| Version 1 | DOI: 10.17632/s22s7s374r.1
Mikkel Nielsen,
Ivan Nikolov


The dataset contains 3 sets of digital elevation models (DEM) from the surface of the leading edge of a wind turbine blade section. The DEMs were acquired from 35 mm × 35 mm regions of interest (RoI) on the blade surface in two different ways; confocal microscopy of a replica of the surface using replica moulding and a rasterized RoI from a high-resolution Structure-from-Motion (SfM) reconstruction. The DEMs are provided as ASCII files with 13 lines of header describing the image size in both pixels and absolute length and width. The confocal microscopy images were acquired using a PLU NEOX confocal microscope by Sensofar with a x5 magnification objective (NA = 0.15). For each image, a 4 × 4 binning was used resulting in a final pixel size of 13.3 μm. The images for the SfM reconstruction were acquired using a Canon 5DS DSLR camera with a variable zoom lens (Canon 70-300 f/4-5.6L IS USM)with the focal length fixed at 300 mm. The reconstruction was performed using Agisoft Metashape and the resultant 3D mesh is available in .obj format. The DEM was created using the software CloudCompare by rasterization and point interpolation of the extracted RoI of the point cloud. The resulting pixel size was chosen to be 13.3 μm to match the reference microscopy images.