{
  "title": "Ocean-connected +4 m EGM2008 modern-terrain scenario",
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    "local_mean_sea_level_conversion": "none",
    "classification_resolution": "native 1 arcsecond; no resampling"
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    "threshold": "valid modern DeltaDTM land cell elevation <= chosen level (metres above EGM2008 geoid)",
    "connectivity": "4-neighbour ocean-connected binary propagation on native grid",
    "ocean_seeds": "All pixels outside original full-resolution GSHHG 2.3.7 level-1 land polygons; levels 2-4 excluded so inland lakes are filled land, not seeds",
    "missing_data": "unavailable or clipped land is a barrier, never assumed zero",
    "output": "Additional flooded land only in GeoJSON; native raster separately distinguishes modern sea, flooded land, dry land, unknown land",
    "polygonization": "Exact native-grid cell boundaries, 4-neighbour; no geometry simplification",
    "sensitivity": "3 and 5 m EGM2008 are threshold sensitivity scenarios, not statistical confidence limits"
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    "This is a static modern-terrain elevation/connectivity scenario, not an ancient shoreline reconstruction.",
    "No sediment deposition, erosion, compaction, tectonics, subsidence, ancient channels, or historical sea-level correction is modelled.",
    "EGM2008 geoid height is not local present mean sea level; the threshold is exactly +4 m EGM2008, not a precise 4 m sea-level rise.",
    "Native 1 arcsecond spacing (roughly 27 x 31 m here) does not imply equivalent elevation or shoreline accuracy.",
    "Published global mean absolute elevation error (v1.1 record: 0.43 m) is not a site-specific error bound; no local ground-truth validation has been performed.",
    "Modern levees, embankments and altered waterways can affect connectivity; 4-neighbour grid connectivity can miss sub-cell channels.",
    "GSHHG modern coast and DeltaDTM can disagree at the shoreline; seeding uses documented full-resolution GSHHG without coastline simplification.",
    "No tides, flow friction, storm surge, waves, barriers removed, or timed hydraulic propagation is modelled."
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  "sources": [
    {
      "title": "DeltaDTM v1.1, official version 4 dataset",
      "url": "https://doi.org/10.4121/21997565.v4",
      "license": "CC BY 4.0",
      "temporal_coverage": "2012-2024"
    },
    {
      "title": "Pronk et al. (2024), DeltaDTM: A global coastal digital terrain model",
      "url": "https://doi.org/10.1038/s41597-024-03091-9"
    },
    {
      "title": "Official v1.1 README, including EGM2008 datum and 30 m clipping",
      "url": "https://data.4tu.nl/file/1da2e70f-6c4d-4b03-86bd-b53e789cc629/71c77b5f-b340-4fdb-a1b1-1d255b8ddb0f"
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    {
      "title": "GSHHG 2.3.7 full-resolution geography",
      "url": "https://github.com/GenericMappingTools/gshhg-gmt/releases/tag/2.3.7",
      "local_coast_sha256": "c175b8ef1332c63591d61ca439732f24015ec610ab1b2ec208a29be4cb3c8d6a"
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      "sha256": "98086b6c84263097683a95f2f392636255a28789141906caed7bfaeafdb411cc",
      "flooded_land_cells_on_model_boundary": {
        "west": 0,
        "east": 308,
        "north": 0,
        "south": 0
      },
      "invalid_geojson_polygons": 0
    },
    "5": {
      "additional_flooded_native_cells": 13304695,
      "additional_area_km2": 10948.437308579398,
      "polygon_features": 455,
      "file": "flood-5m.geojson",
      "bytes": 9210805,
      "sha256": "72b28beea906fe1a6265c5eb5a8a1f17ad977d637f2a736c91e2de3fe4e10eec",
      "flooded_land_cells_on_model_boundary": {
        "west": 0,
        "east": 383,
        "north": 0,
        "south": 3
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      "invalid_geojson_polygons": 0
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  },
  "native_mask": {
    "file": "flood-4m-native.tif",
    "bytes": 926058,
    "sha256": "027e0e3cf58f45f7b82d151ff1dfafb78efaec2959fcf21b006deb2bb361020f",
    "values": {
      "0": "dry valid land",
      "1": "modern sea",
      "2": "additional flooded land",
      "255": "unavailable or clipped land; barrier"
    }
  },
  "verification": {
    "native_raster_dimensions": [
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    ],
    "native_raster_category_counts": {
      "0": 109638762,
      "1": 24579753,
      "2": 12128802,
      "255": 22780683
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    "additional_flooded_cells_above_4m_or_nodata": 0,
    "invalid_geojson_polygons": {
      "3m": 0,
      "4m": 0,
      "5m": 0
    },
    "east_boundary_4m_contact_latitude_range": [
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    ],
    "boundary_note": "The eastern coastal fringe is clipped at longitude49.8501389; western/northern/southern boundaries have no4m flooded land cells. This scenario does not claim a closed or Gulf-wide shoreline.",
    "downloaded_dtm_members": 13,
    "downloaded_dtm_member_bytes": 337148822,
    "archive_download_strategy": "HTTP206 central-directory and selected-member byte ranges; full17.28GB Asia archive not downloaded"
  },
  "dataset_version": {
    "repository_version": 4,
    "repository_label": "DeltaDTM v1.1",
    "actual_processing_version": "1.1.1",
    "correction_date": "2024-12-10",
    "correction": "Reprocessed after ICESat-2 processing errors in the previous release caused large inland depressions.",
    "changelog_url": "https://data.4tu.nl/file/1da2e70f-6c4d-4b03-86bd-b53e789cc629/b0403ff2-0aa5-4394-9413-2eb851e0fa50",
    "changelog_sha256": "e17613a95229ddc981533ed164b26b59c30f95f650287a52de7cb36523dccb4c",
    "readme_url": "https://data.4tu.nl/file/1da2e70f-6c4d-4b03-86bd-b53e789cc629/71c77b5f-b340-4fdb-a1b1-1d255b8ddb0f",
    "readme_sha256": "9da10b0576ff4368a756bd5646b091fab6b7c7c7d217a6f758fbe0803f826e00"
  }
}