{
  "type": "Collection",
  "stac_version": "1.0.0",
  "stac_extensions": [
    "https://stac-extensions.github.io/raster/v1.1.0/schema.json",
    "https://stac-extensions.github.io/table/v1.2.0/schema.json"
  ],
  "id": "global-human-modification",
  "title": "Global Human Modification (gHM)",
  "description": "Theobald et al. Global Human Modification (gHM): a cumulative measure of human modification of terrestrial lands, expressed as a continuous 0–1 index at ~1 km resolution circa 2016. The index integrates the physical extent and intensity of human stressors (settlements, agriculture, transportation, mining/energy, electrical infrastructure) into a single per-pixel value where 0 = no modification and 1 = fully modified.\n\nThis collection provides two cloud-native representations derived from the source raster (originally distributed in World Mollweide, reprojected here to EPSG:4326):\n\n- **`ghm-cog`** — a WGS84 Cloud-Optimized GeoTIFF of the 0–1 index (for titiler/XYZ web maps and raster analysis).\n- **`ghm-hex`** — an H3 hexagonal aggregation at native resolution 8 (partitioned by h0). Each cell holds the coverage-weighted **mean** gHM of the source pixels it covers (the index is an intensity, so mean — never sum). Native `h8` is the catalog's standard join key, so this layer joins directly (`h8 = h8`) to the other res-8 hex datasets.\n\n**Aggregation note:** gHM is a per-area intensity (0–1), so aggregate cells with AVG/mean (optionally area-weighted), never SUM.",
  "license": "CC-BY-4.0",
  "keywords": ["human modification", "human footprint", "anthropogenic", "land use", "pressures", "gHM", "H3"],
  "providers": [
    {"name": "David M. Theobald et al.", "roles": ["producer", "licensor"], "url": "https://doi.org/10.6084/m9.figshare.7283087"},
    {"name": "Boettiger Lab", "roles": ["processor", "host"], "url": "https://s3-west.nrp-nautilus.io/public-human-modification/"}
  ],
  "extent": {
    "spatial": {"bbox": [[-180, -90, 180, 90]]},
    "temporal": {"interval": [["2016-01-01T00:00:00Z", "2016-12-31T23:59:59Z"]]}
  },
  "sci:doi": "10.6084/m9.figshare.7283087",
  "links": [
    {"rel": "self", "href": "https://s3-west.nrp-nautilus.io/public-human-modification/stac-collection.json", "type": "application/json"},
    {"rel": "root", "href": "https://s3-west.nrp-nautilus.io/public-data/stac/catalog.json", "type": "application/json"},
    {"rel": "parent", "href": "https://s3-west.nrp-nautilus.io/public-data/stac/catalog.json", "type": "application/json"},
    {"rel": "license", "href": "https://creativecommons.org/licenses/by/4.0/", "type": "text/html", "title": "CC BY 4.0"},
    {"rel": "cite-as", "href": "https://doi.org/10.6084/m9.figshare.7283087"}
  ],
  "assets": {
    "ghm-cog": {
      "href": "https://s3-west.nrp-nautilus.io/public-human-modification/ghm-cog.tif",
      "type": "image/tiff; application=geotiff; profile=cloud-optimized",
      "title": "Global Human Modification — WGS84 Cloud-Optimized GeoTIFF",
      "roles": ["data"],
      "raster:bands": [
        {
          "name": "ghm",
          "data_type": "float32",
          "nodata": -3.4028234663852886e+38,
          "unit": "index (0–1)",
          "spatial_resolution": 1000,
          "description": "Cumulative human modification index, 0 (no modification) to 1 (fully modified). Reprojected from the source World Mollweide raster to EPSG:4326."
        }
      ]
    },
    "ghm-hex": {
      "href": "https://s3-west.nrp-nautilus.io/public-human-modification/ghm/hex/h0=*/data_0.parquet",
      "type": "application/x-parquet",
      "title": "Global Human Modification — H3 hex (res 8)",
      "roles": ["data"],
      "h3:native_resolution": 8,
      "h3:parent_resolutions": [0],
      "table:columns": [
        {
          "name": "ghm",
          "type": "double",
          "description": "Cumulative human modification index, 0–1. Coverage-weighted MEAN of the source ~1 km gHM pixels within the cell (the index is a per-area intensity — aggregate with AVG/mean, never SUM). NoData source pixels are excluded from the mean."
        },
        {"name": "h8", "type": "uint64", "description": "H3 cell ID at resolution 8 (native resolution; the catalog's standard join key — one row per cell)."},
        {"name": "h0", "type": "int64", "description": "H3 cell ID at resolution 0, the hive partition key for partitioned reads."}
      ]
    }
  }
}