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. In this video tutorial, we demonstrate how to use the TauDEM (Terrain Analysis Using Digital Elevation Models) tools on the OpenTopography website for hydrology analyses. CHMs are calculated by subtracting the digital terrain model (DTM) from the digital surface model (DSM). We demonstrate how to produce a canopy height model (CHM), also known as a normalized digital surface model, on-demand on OpenTopography. This video demonstrates how to request and use an API Key for OpenTopography's global datasets API. Using API Keys to Access OpenTopography’s Global Datasets API: In this video, we show how to access global and regional topographic data, including SRTM and ALOS, and download DEMs and derived visualizations. 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. We show how to make a digital elevation model (DEM) and how to create create a KMZ to display the hillshade on Google Earth or other GIS programs.Īccessing USGS 3DEP data on OpenTopography:
Creating a digital elevation model and topographic hillshade:
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