{
 "id": "common-data-format-dotcdf-3-x",
 "name": "Common Data Format dotCDF",
 "family": "common-data-format",
 "category": "dataset",
 "identifiers": {
  "extensions": [
   "cdf"
  ],
  "puid": [
   "fmt/1950"
  ],
  "wikidata": [
   "Q1116060",
   "Q125868958"
  ],
  "loc_fdd": [
   "fdd000226"
  ],
  "magic": [
   {
    "offset": 0,
    "hex": "cdf30001",
    "notes": "CDF 3.x"
   }
  ],
  "signatures": [
   {
    "name": "CDF 3.x",
    "sequences": [
     {
      "position": "bof",
      "offset": 0,
      "pattern": "cdf30001(0000ffff|cccc0001){8}00000001"
     }
    ]
   }
  ]
 },
 "status": "unknown",
 "summary": "Common Data Format is a library and toolkit that was developed by the National Space Science Data Center (NSSDC) at NASA, used for the storage and processing of multi-dimensional datasets. The ‘dotCDF’ file as described in the specification refers specifically to the filetype with extension .cdf. The dotCDF file may be a standalone file containing everything it needs, or it may have companion ‘variable’ files with the extension .vX, where X represents an incrementing numeric value, e.g. .v0, .v1 etc. This entry covers versions 3.x. Version 3.x introduced 8-byte (64bit) record sizes and offsets.",
 "projects": [
  {
   "name": "PRONOM fmt/1950",
   "url": "https://www.nationalarchives.gov.uk/PRONOM/fmt/1950",
   "kind": "format-doc"
  },
  {
   "name": "Wikidata Q125868958",
   "url": "https://www.wikidata.org/wiki/Q125868958",
   "kind": "wiki"
  }
 ],
 "provenance": {
  "sources": [
   "pronom",
   "wikidata"
  ]
 },
 "updated": "2026-10-20",
 "version": "3.x",
 "aliases": [],
 "structure": [],
 "parsers": [],
 "tools": [
  {
   "name": "FlexPro",
   "url": "http://www.weisang.com/",
   "reads": true,
   "writes": true,
   "license": "proprietary license",
   "via": "common-data-format"
  },
  {
   "name": "IBM OpenDX",
   "url": "http://www.opendx.org",
   "reads": true,
   "writes": false,
   "license": "IBM Public License",
   "open_source": true,
   "via": "common-data-format"
  },
  {
   "name": "kst",
   "url": "https://kst-plot.kde.org/",
   "reads": true,
   "writes": false,
   "license": "GNU General Public License",
   "open_source": true,
   "via": "common-data-format"
  }
 ],
 "conversions": [],
 "samples": [],
 "claims": [],
 "verification": []
}