The collected data underwent a detailed processing workflow to ensure high-quality deliverables:
1. QBase:
• Geotagged images using a PPK workflow for improved positional accuracy; this process utilized GNSS base stations recording raw static data, which were then processed through PPP to get an accurate ground point to PPK the drone data.
2. Pix4Dmapper:
• Conducted initial processing, including keypoint computation, automatic aerial triangulation, and bundle block adjustment.
• Performed point cloud densification.
• Generated an orthomosaic to create a seamless georeferenced map.
3. LAStools and LidR R Package:
• Classified the densified photogrammetry point cloud into categories (e.g., ground, vegetation, etc.).
• Rasterized the point cloud into digital elevation models (DEMs).