GeolocationCoordinates.altitude - Web APIs 编辑

Secure context

This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The GeolocationCoordinates.altitude read-only property is a double representing the altitude of the position in meters above the WGS84 ellipsoid (which defines the nominal sea level surface). This value is null if the implementation cannot provide this data.

Syntax

let alt = geolocationCoordinatesInstance.altitude

Value

A double representing the altitude of the position in meters above the WGS84 ellipsoid.

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• Using the Geolocation API
• The GeolocationCoordinates interface it belongs to.
• National Imagery and Mapping Agency Technical Report 8350.2, Third Edition (WGS84)