@openstreetmap/id-tagging-schema/data/fields/circumference.json

The OpenStreetMap tagging model used by the iD editor

{
    "key": "circumference",
    "type": "combo",
    "label": "Circumference (at Breast Height)",
    "snake_case": false,
    "placeholder": "1 m, 20 cm, 30\"…",
    "terms": [
        "dbh",
        "diameter at breast height"
    ]
}