"Helmert transformation" meaning in English

{
  "etymology_text": "Named after Friedrich Robert Helmert (1843–1917).",
  "forms": [
    {
      "form": "Helmert transformations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Helmert transformation (plural Helmert transformations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
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      ],
      "glosses": [
        "A kind of transformation in three-dimensional space, frequently used in geodesy to avoid distortion when converting from one datum to another."
      ],
      "id": "en-Helmert_transformation-en-noun-MWHZ3saE",
      "links": [
        [
          "three-dimensional",
          "three-dimensional"
        ],
        [
          "space",
          "space"
        ],
        [
          "geodesy",
          "geodesy"
        ],
        [
          "distortion",
          "distortion"
        ],
        [
          "datum",
          "datum"
        ]
      ],
      "wikipedia": [
        "Helmert transformation"
      ]
    }
  ],
  "word": "Helmert transformation"
}

{
  "etymology_text": "Named after Friedrich Robert Helmert (1843–1917).",
  "forms": [
    {
      "form": "Helmert transformations",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Helmert transformation (plural Helmert transformations)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A kind of transformation in three-dimensional space, frequently used in geodesy to avoid distortion when converting from one datum to another."
      ],
      "links": [
        [
          "three-dimensional",
          "three-dimensional"
        ],
        [
          "space",
          "space"
        ],
        [
          "geodesy",
          "geodesy"
        ],
        [
          "distortion",
          "distortion"
        ],
        [
          "datum",
          "datum"
        ]
      ],
      "wikipedia": [
        "Helmert transformation"
      ]
    }
  ],
  "word": "Helmert transformation"
}