What is wgs84 format

Overview

WGS84 format encompasses the various standardized ways to express geographic coordinates in the World Geodetic System 1984 coordinate system. WGS84 is the global standard used by GPS, maps, navigation systems, and geographic information systems (GIS). The format specifies how latitude, longitude, and optional altitude values are written, stored, and transmitted.

Coordinate Components

Every WGS84 coordinate consists of two required components: Latitude ranges from -90° (South Pole) to +90° (North Pole), with 0° being the Equator. Longitude ranges from -180° to +180°, with 0° being the Prime Meridian. Optionally, a third component—Altitude—represents height above the WGS84 ellipsoid in meters.

Common Coordinate Formats

Decimal Degrees (DD): The most computer-friendly format, expressing coordinates as decimal numbers. Example: 40.7128° N, -74.0060° W (New York City). Negative values indicate South latitude or West longitude.

Degrees/Minutes/Seconds (DMS): Traditional navigation format dividing degrees into 60 minutes and minutes into 60 seconds. Example: 40° 42' 46.08" N, 74° 0' 21.60" W. This format is common on nautical charts and aviation.

Degrees/Decimal Minutes (DDM): A hybrid format using degrees and decimal minutes. Example: 40° 42.768' N, 74° 0.36' W. This format is useful for handheld GPS devices.

Storage and Representation

Digital systems typically store WGS84 coordinates in decimal degree format for efficiency. Metadata indicators (N/S for latitude, E/W for longitude, or ± signs) specify hemisphere. GIS software can convert between formats automatically. Web-based mapping services like Google Maps use WGS84 DD internally.

Practical Usage

GPS receivers output coordinates in selectable formats (DD, DMS, or DDM). Mapping applications like Google Maps display coordinates in WGS84 DD. GIS software (ArcGIS, QGIS) uses WGS84 as the default geographic coordinate system. Mobile applications typically use WGS84 coordinates for location services.