Fig. 1
From: Novel mapping approach for coastal boulders using deep learning
Location map and DSM of study area. (a) Location map of Ishigaki Island, southwestern Japan. The base map imagery is from the Blue Marble Next Generation layer, provided by the National Aeronautics and Space Administration (NASA). (b) Detailed map of the Shiraho coastal area, Southeast Ishigaki Island drawn using Mapping Toolbox in MATLAB, showing the training (red polygon) and testing (blue polygon) areas for detecting boulders in this study. The inset shows the location within the island. The base map tiles are from the Geospatial Information Authority of Japan (GSI). Both maps were created using the Mapping Toolbox in MATLAB (Version R2024a, The MathWorks Inc., Natick, MA, USA, https://www.mathworks.com) and QGIS (Version 3.36, a project of the Open Source Geospatial Foundation, https://qgis.org). (c) Orthoimage (Ortho 202205) and (d) Digital Surface Model (DSM 202205) of the Shiraho area. The southern part (outlined in red) was used for training, and the northern part (outlined in blue) was used for testing the boulder detection model.
