Multiscale erosion dynamics on shore platforms at Kaikōura Peninsula, South Island, New Zealand
This data presents erosion measurements across micro and meso-spatial at multi-temporal scales using Structure-from-Motion (SfM) photogrammetry derived point clouds (PCs) to understand morphological factors and processes controlling cross-scale erosion on the uplifted shore platforms at Kaikōura. The data covers erosion rates and size (volume) distribution of eroded products over two years across microscale (~0.01 m2) and mesoscale (> 0.01 m2) areas of inter-tidal shore platforms and marine terraces on Kaikōura Peninsula.
Steps to reproduce
Dense point clouds were generated from the Agisoft software were imported into the CloudCompare for differencing. The point cloud (PC) differencing approach was carried out using the 2.5D volume tool in CloudCompare to compute volumetric change between PC models and PCs of different periods were subtracted to produce the changed surface. In the volume analysis, the related footprint area is multiplied by the difference in cell heights, grid steps were set to 0.001 m with the direction of projection along the z-axis and empty spaces in the point clouds "left empty" to avoid introducing interpolation errors into the surface change results. The results from the volumetric change analysis include the total volume (m3), total surface area (m2), detached volume (m3) and deposition volume (m3). The differenced models were exported as clouds to derive estimates for the mean volume of detached (MDV) rocks and standard deviation of detached volume (StdV), representing the size and variation of eroded materials, respectively.
Royal Society Te Apārangi