OpenTopography is pleased to announce that we're now offering access to USGS 3D Elevation Program (3DEP) Standard Digital Elevation Models (DEMs) through our easy to use web-based interface with associated processing and visualization tools. USGS 3DEP DEMs are available at 1 arc-second (~30m), 1/3 arc-second (~10m), and 1-meter.
USGS 3DEP Standard DEMs represent the topographic surface of the earth and contain flattened water surfaces. Each DEM dataset is identified by its horizontal resolution and is produced to a consistent set of specifications. The elevations in these DEMs represent the topographic bare-earth surface (a.k.a. Digital Terrain Model (DTM)). Standard DEMs are characterized either as project-based or seamless. Project-based DEMs (e.g. 1-meter) are available for the full areal extents of projects when produced from lidar. Seamless DEMs (e.g. 1/3 arc-second and 1 arc second) are produced by blending only the highest quality project data into a continuous terrain surface for the U.S., and are updated continuously to integrate newly available, improved elevation source data.
OpenTopography access to USGS 3DEP DEMs leverages the USGS National Map API as well as recent USGS efforts to migrate 3DEP DEM data to Cloud Optimized GeoTIFF (COG) format hosted on Amazon Web services (AWS). All USGS Standard DEM data requests through OpenTopography will subset the USGS rasters from AWS on-the-fly and return a seamless, raster mosaic based on a user's area of interest. This API-based approach ensures that OpenTopography users have access to the most recently available USGS 3DEP topographic data. Please note that this service relies on external USGS services beyond OpenTopography control and thus outages may be possible.
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