{"id": "usa-usgs-3dep-1m", "type": "Collection", "links": [{"rel": "items", "type": "application/geo+json", "href": "https://api.darly.io/collections/usa-usgs-3dep-1m/items"}, {"rel": "parent", "type": "application/json", "href": "https://api.darly.io/"}, {"rel": "root", "type": "application/json", "href": "https://api.darly.io/"}, {"rel": "self", "type": "application/json", "href": "https://api.darly.io/collections/usa-usgs-3dep-1m"}], "title": "USA - USGS 3DEP 1m DEM (per-project)", "extent": {"spatial": {"bbox": [[-159.78814697265625, 17.673141479492188, -64.56409454345703, 49.397518157958984]]}, "temporal": {"interval": [["2011-12-10T00:00:00+00:00", "2026-05-01T23:59:59+00:00"]]}}, "license": "CC0-1.0", "sci:doi": "10.5066/P9GAJ9AZ", "keywords": ["DEM", "DTM", "elevation", "terrain", "lidar", "3DEP", "USGS", "United States", "1m"], "providers": [{"url": "https://www.usgs.gov/3d-elevation-program", "name": "U.S. Geological Survey, 3D Elevation Program (3DEP)", "roles": ["producer", "licensor", "host"]}, {"url": "https://darly.io", "name": "Darly", "roles": ["processor"]}], "summaries": {"gsd": [1], "instruments": ["lidar"]}, "description": "Per-project (\"classic\") 1-meter Digital Elevation Models from the USGS 3D Elevation Program (3DEP), staged on The National Map's public S3 bucket.\n\n**Source & method:** Bare-earth DTMs derived from 3DEP-quality airborne **lidar**, published per acquisition project as delivered. Unlike the reprocessed [seamless S1M product](https://darly.io/explorer?c=usa-usgs-3dep-1m-seamless), tiles keep each project's original processing: adjacent projects may show seams, and overlapping projects of different vintages both remain available.\n\n**Resolution:** 1 m ground sample distance, 10 km x 10 km tiles.\n\n**Coordinate reference:** NAD83 UTM zones (per-tile, see each item's assets); elevations in meters on NAVD88 (EPSG:5703).\n\n**Coverage:** Most of the conterminous US plus parts of Alaska and Hawaii, growing as 3DEP projects publish. Acquisition dates span roughly 2010 to present and vary per project \u2014 see each item's start/end datetimes.\n\n**Documentation:**\n- [USGS 3D Elevation Program](https://www.usgs.gov/3d-elevation-program)\n- [1-meter DEM product page](https://data.usgs.gov/datacatalog/data/USGS:77ae0551-c61e-4979-aedd-d797abdcde0e)\n- [Staged products directory](https://prd-tnm.s3.amazonaws.com/index.html?prefix=StagedProducts/Elevation/1m/Projects/)\n", "item_assets": {"dtm": {"type": "image/tiff; application=geotiff; profile=cloud-optimized", "roles": ["data", "dtm"], "title": "Digital Terrain Model (DTM)"}, "preview": {"type": "image/jpeg", "roles": ["overview"], "title": "Preview Image"}, "metadata": {"type": "application/xml", "roles": ["metadata"], "title": "FGDC Metadata (XML)"}}, "sci:citation": "U.S. Geological Survey, 2019, USGS one meter digital elevation model: U.S. Geological Survey data release, https://doi.org/10.5066/P9GAJ9AZ.", "stac_version": "1.0.0", "stac_extensions": ["https://stac-extensions.github.io/item-assets/v1.0.0/schema.json", "https://stac-extensions.github.io/scientific/v1.0.0/schema.json"]}