What is wgs84 altitude

Last updated: April 1, 2026

Quick Answer: WGS84 altitude is the vertical height of a point measured from the WGS84 ellipsoid, a global reference surface used in GPS systems and geographic coordinate systems worldwide.

Key Facts

Overview

WGS84 (World Geodetic System 1984) is the global standard coordinate system adopted by the Global Positioning System (GPS) and used internationally for mapping, navigation, and surveying. WGS84 altitude refers specifically to the vertical component of a three-dimensional coordinate, representing the height above the WGS84 reference ellipsoid.

The WGS84 Ellipsoid

Earth is not a perfect sphere but an oblate spheroid—slightly flattened at the poles and bulging at the equator. The WGS84 ellipsoid is a mathematical model of this shape defined by specific parameters. It serves as the reference surface from which all altitudes and coordinates are measured. Every GPS receiver calculates positions relative to this ellipsoid.

Altitude vs. Elevation

WGS84 altitude and elevation above Mean Sea Level (MSL) are different measurements. WGS84 altitude is measured perpendicular to the ellipsoid, while elevation is measured from sea level. The difference between these two is called the geoid undulation or N-value, which varies geographically and can be 50+ meters in some locations.

Practical Applications

Aircraft altitude is typically reported in relation to a datum—either WGS84 ellipsoidal height or MSL elevation. Surveyors use WGS84 altitude for precise measurements. Satellite operations depend on accurate WGS84 coordinates for orbital calculations. Mapping and GIS systems rely on WGS84 for global consistency.

Accuracy and Precision

GPS receivers provide altitude measurements typically accurate to within 5-15 meters for civilian use, though professional-grade receivers can achieve centimeter-level accuracy. WGS84 altitude precision depends on atmospheric conditions, satellite geometry, and receiver quality.

Related Questions

What is the difference between WGS84 altitude and Mean Sea Level?

WGS84 altitude is measured from the mathematical ellipsoid, while MSL elevation is measured from average sea level. The difference varies by location and is called geoid undulation.

How accurate is WGS84 for altitude measurement?

Standard GPS receivers provide WGS84 altitude accuracy within 5-15 meters. Professional surveying equipment can achieve centimeter-level accuracy with differential GPS techniques.

Where is WGS84 used?

WGS84 is the standard for GPS, aviation, maritime navigation, surveying, mapping, satellite operations, and most geospatial applications worldwide.

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Sources

  1. USGS - GPS Coordinates and Datums Public Domain
  2. National Geospatial-Intelligence Agency - WGS84 Public Domain