We demonstrate these tools on the B4 lidar dataset along the San Andreas Fault. We demonstrate how to select the size and resolution, apply a vertical exaggeration and add a base to the 3D model. We discuss how to make a 3D print from topography data using free and open source software including the DEMto3D plugin in QGIS and MeshLab. This algorithm is best applied when the landscape shifts laterally such as in earthquakes, creeping landslides, and sand dune migration. The 3D differencing tool uses the Iterative Closest Point algorithm to compute the best rigid deformation to register point clouds.

Learn how to perform 3D differencing on OpenTopography's web interface. As of late 2020, vertical differencing is enabled on over 60 dataset pairs that capture a number of processes including urban growth, vegetation change, river processes, earthquakes and landslides. Watch this video tutorial to learn how to perform vertical change detection on OpenTopography's web interface. Use the Potree viewer to visualize datasets by attribute such as classification, intensity or color, and to make measurements on the point cloud. We demonstrate how to use the Potree point cloud viewer as part of our treasure hunt activity. Currently, this service is limited to US academics but others can indicate interest in accessing this dataset after creating a free OpenTopography account. Learn how to access the USGS 3DEP dataset on OpenTopography.

Accessing USGS 3DEP data on OpenTopography:

Esri 3d earthquake globe video