Envelope

{
    "isNull": true,
    "width": 0,
    "height": 0,
    "diameter": 0,
    "minX": 0,
    "maxX": 0,
    "minY": 0,
    "maxY": 0,
    "area": 0,
    "minExtent": 0,
    "maxExtent": 0,
    "centre": {
        "x": 0,
        "y": 0,
        "z": 0,
        "m": 0,
        "coordinateValue": {},
        "isValid": true
    }
}