{"id": "sam-ufrgs-anadem-30m", "type": "Collection", "links": [{"rel": "items", "type": "application/geo+json", "href": "https://api.darly.io/collections/sam-ufrgs-anadem-30m/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/sam-ufrgs-anadem-30m"}, {"rel": "license", "href": "https://creativecommons.org/licenses/by/4.0/", "title": "CC-BY-4.0"}], "title": "SAM - UFRGS ANADEM 30m", "extent": {"spatial": {"bbox": [[-82.51654815673828, -56.76095199584961, -31.89118003845215, 14.079475402832031]]}, "temporal": {"interval": [["2011-01-01T00:00:00+00:00", "2015-07-31T23:59:59+00:00"]]}}, "license": "CC-BY-4.0", "sci:doi": "10.3390/rs16132321", "version": "1", "keywords": ["DEM", "DTM", "elevation", "terrain", "bare-earth", "ANADEM", "UFRGS", "ANA", "GEDI", "South America", "Brazil", "30m"], "providers": [{"url": "https://hge-iph.github.io/anadem/", "name": "Universidade Federal do Rio Grande do Sul (UFRGS/IPH)", "roles": ["producer", "processor", "licensor"]}, {"url": "https://www.gov.br/ana/", "name": "Ag\u00eancia Nacional de \u00c1guas e Saneamento B\u00e1sico (ANA)", "roles": ["producer"]}, {"url": "https://portal.opentopography.org/raster?opentopoID=OTSDEM.082025.4674.1", "name": "OpenTopography", "roles": ["host"]}, {"url": "https://darly.io", "name": "Darly", "roles": ["processor"]}], "summaries": {"gsd": [30]}, "description": "ANADEM: a **bare-earth Digital Terrain Model for South America** at ~30 m resolution, produced by the Federal University of Rio Grande do Sul (UFRGS/IPH) with the Brazilian National Water and Sanitation Agency (ANA).\n\n**Source & method:** A true **Digital Terrain Model (DTM)** \u2014 it removes the vegetation bias from the Copernicus DEM GLO-30 surface model with a machine- learning correction calibrated specifically for South America, combining Landsat-8 / Sentinel-2 spectral indices (EVI, NDMI, MSAVI) with GEDI spaceborne- lidar ground elevations.\n\n**Resolution:** 30 m nominal, on a single continent-wide mosaic (one item, not tiled).\n\n**Coordinate reference:** Geographic SIRGAS 2000 (EPSG:4674 \u2014 WGS84-equivalent at this resolution); elevations in meters on the EGM2008 geoid (EPSG:3855).\n\n**Hosting:** The asset references the public, anonymously readable Cloud-Optimized GeoTIFF on OpenTopography (`opentopography.s3.sdsc.edu`) **in place** \u2014 Darly does not re-host or copy the pixels.\n\n**Coverage:** Continental South America (82.5\u00b0W\u201331.9\u00b0W, 56.8\u00b0S\u201314.1\u00b0N).\n\n**Version:** v1 (current). New non-breaking versions overwrite this mosaic in place; a breaking change (different resolution/CRS/datum) would get its own collection.\n\n**Documentation:**\n- [ANADEM project page](https://hge-iph.github.io/anadem/)\n- [OpenTopography dataset](https://portal.opentopography.org/raster?opentopoID=OTSDEM.082025.4674.1)\n- [Remote Sensing paper (DOI 10.3390/rs16132321)](https://doi.org/10.3390/rs16132321)\n", "item_assets": {"dtm": {"type": "image/tiff; application=geotiff; profile=cloud-optimized", "roles": ["data", "dtm"], "title": "Digital Terrain Model"}}, "sci:citation": "Laipelt, L.; Andrade, B.C.; Collischonn, W.; Teixeira, A.A.; Paiva, R.C.D.; Ruhoff, A. (2024). ANADEM: A Digital Terrain Model for South America. Remote Sensing, 16(13), 2321.", "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"]}