{
  "@context": {
    "@language": "en",
    "@vocab": "https://schema.org/",
    "citeAs": "cr:citeAs",
    "column": "cr:column",
    "conformsTo": "dct:conformsTo",
    "cr": "http://mlcommons.org/croissant/",
    "data": {
      "@id": "cr:data",
      "@type": "@json"
    },
    "dataType": {
      "@id": "cr:dataType",
      "@type": "@vocab"
    },
    "dct": "http://purl.org/dc/terms/",
    "examples": {
      "@id": "cr:examples",
      "@type": "@json"
    },
    "extract": "cr:extract",
    "field": "cr:field",
    "fileProperty": "cr:fileProperty",
    "fileObject": "cr:fileObject",
    "fileSet": "cr:fileSet",
    "format": "cr:format",
    "includes": "cr:includes",
    "isLiveDataset": "cr:isLiveDataset",
    "jsonPath": "cr:jsonPath",
    "key": "cr:key",
    "md5": "cr:md5",
    "parentField": "cr:parentField",
    "path": "cr:path",
    "recordSet": "cr:recordSet",
    "references": "cr:references",
    "regex": "cr:regex",
    "repeated": "cr:repeated",
    "replace": "cr:replace",
    "sc": "https://schema.org/",
    "separator": "cr:separator",
    "source": "cr:source",
    "subField": "cr:subField",
    "transform": "cr:transform"
  },
  "@type": "sc:Dataset",
  "conformsTo": "http://mlcommons.org/croissant/1.0",
  "name": "hemibrain",
  "title": "Hemibrain \u2014 Drosophila central brain connectome (~25k neurons)",
  "description": "The Janelia FlyEM Hemibrain v1.2.1 connectome \u2014 a dense FIB-SEM reconstruction of a large portion of\nthe adult Drosophila melanogaster central brain (Scheffer et al. 2020), one of the foundational fly\nconnectomes.\n\nThis scene is 25,000 reconstructed neurons (the largest traced bodies), each a full-resolution surface\nmesh served as a u16-quantized meshopt (q14) 3D-Tiles octree and tagged with neuPrint metadata: cell\ntype, instance name, traced status, pre/post synapse counts, and dominant neuropil region. Each neuron\nis colored individually; use \"Color By\" Cell Type / Primary ROI to read the brain's organization. At\n25k dense neurons it is a heavy volume \u2014 use the viewer's filter / Force-Zoom coarse LOD to explore\nsubsets and regions.\n",
  "url": "https://ngrf.mudm.io/datasets/hemibrain.html",
  "license": "https://creativecommons.org/licenses/by/4.0/",
  "keywords": [
    "connectome",
    "neurons",
    "em",
    "3d-tiles",
    "drosophila",
    "hemibrain"
  ],
  "distribution": [
    {
      "@type": "cr:FileObject",
      "@id": "parquet-archive",
      "name": "parquet-archive",
      "description": "muDM features Parquet tree, served directly over HTTP \u2014 Hive-partitioned, range-readable.",
      "contentUrl": "https://ngrf.mudm.io/tiles/hemibrain/features.parquet/",
      "encodingFormat": "application/vnd.apache.parquet"
    },
    {
      "@type": "cr:FileSet",
      "@id": "features-parquet",
      "name": "features-parquet",
      "description": "muDM binary tile geometry, NOT GeoParquet. Hive-partitioned by zoom=.",
      "containedIn": {
        "@id": "parquet-archive"
      },
      "encodingFormat": "application/x-parquet",
      "includes": "**/*.parquet"
    }
  ],
  "recordSet": [
    {
      "@type": "cr:RecordSet",
      "@id": "features",
      "name": "features",
      "description": "Per-feature muDM tile geometry + properties.",
      "field": [
        {
          "@type": "cr:Field",
          "@id": "features/tile_x",
          "name": "tile_x",
          "description": "Tile column index.",
          "dataType": "sc:Integer",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "tile_x"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/tile_y",
          "name": "tile_y",
          "description": "Tile row index.",
          "dataType": "sc:Integer",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "tile_y"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/feature_id",
          "name": "feature_id",
          "description": "Stable per-feature id.",
          "dataType": "sc:Integer",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "feature_id"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/geom_type",
          "name": "geom_type",
          "description": "muDM geometry type.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "geom_type"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/positions",
          "name": "positions",
          "description": "Binary-packed vertex positions (muDM geometry, NOT WKB).",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "positions"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/indices",
          "name": "indices",
          "description": "Binary-packed triangle/ring indices.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "indices"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/ring_lengths",
          "name": "ring_lengths",
          "description": "Per-ring vertex counts.",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "ring_lengths"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/tags",
          "name": "tags",
          "description": "Map<Utf8,Utf8> of feature properties (markers/genes stringified).",
          "dataType": "sc:Text",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "tags"
            }
          }
        },
        {
          "@type": "cr:Field",
          "@id": "features/zoom",
          "name": "zoom",
          "description": "Hive partition key (zoom level).",
          "dataType": "sc:Integer",
          "source": {
            "fileSet": {
              "@id": "features-parquet"
            },
            "extract": {
              "column": "zoom"
            }
          }
        }
      ]
    }
  ],
  "citeAs": "Scheffer LK, et al. A connectome and analysis of the adult Drosophila central brain. eLife 9:e57443 (2020). Janelia FlyEM Hemibrain v1.2.1, CC BY 4.0."
}