如何从qt map.tocoordinate（qt.point（））获取高度？

我一直在尝试使用MouseArea从qmlmap（Qt5.12）获取地图坐标。但问题是，我只得到纬度和经度的值，高度为零。我已经看过文件了，但仍然不知道如何更好地解释它。以下是我代码的一部分：

    onPositionChanged: {
        flightMap.focus = true
        var coordinate = flightMap.toCoordinate(Qt.point(mouse.x, mouse.y), false)

        coordinate.latitude = coordinate.latitude.toFixed(_decimalPlaces)
        coordinate.longitude = coordinate.longitude.toFixed(_decimalPlaces)
        coordinate.altitude = coordinate.altitude.toFixed(_decimalPlaces)
        coordlabel.text ="coordPosition: " + coordinate.latitude.toFixed(6)
                                    + ", " + coordinate.longitude.toFixed(6)
                                    + ", " + coordinate.altitude.toFixed(6)

        mouselabel.text ="mousePosition: " + mouse.x.toFixed(2) +
                                      ", " + mouse.y.toFixed(2) +
                            " zoomLevel: " + Math.floor(flightMap.zoomLevel);
    }

海拔是0

地图提供者：Bing

[
{
    "name":             "mapProvider",
    "shortDescription": "Currently selected map provider for flight maps",
    "type":             "string",
    "defaultValue":     "Bing"
},
{
    "name":             "mapType",
    "shortDescription": "Currently selected map type for flight maps",
    "type":             "string",
    "defaultValue":     "Hybrid"
}
]

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您使用什么地图提供商？请提供@folibis Bing地图谢谢，你现在能提供吗？