What is wgs84 format

Last updated: April 1, 2026

Quick Answer: WGS84 format refers to how geographic coordinates in the World Geodetic System 1984 are expressed, typically as latitude and longitude in decimal degrees, degrees/minutes/seconds, or other standardized coordinate notations.

Key Facts

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.

Related Questions

How do I convert between WGS84 coordinate formats?

Most mapping and GIS software automatically converts between DD, DMS, and DDM formats. Online converters are available, or manual conversion using: DD = degrees + (minutes/60) + (seconds/3600).

What is the difference between WGS84 and GPS?

WGS84 is a coordinate system that defines how positions are measured, while GPS is a satellite network that determines your location. GPS uses WGS84 coordinates to communicate your position to your device.

What is the difference between WGS84 and other coordinate systems?

WGS84 is the global standard used by GPS. Other systems like UTM (Universal Transverse Mercator) project WGS84 coordinates onto flat maps. Local datums may differ slightly from WGS84.

How accurate is WGS84?

Standard WGS84 accuracy is typically within 5-10 meters for consumer GPS devices. High-precision systems like RTK-GPS can achieve centimeter-level accuracy using WGS84 coordinates.

How precise is WGS84 coordinate format?

Decimal degree precision varies: 1 decimal place ≈ 11 km accuracy, 2 places ≈ 1.1 km, 5 places ≈ 1.1 meter, 8 places ≈ 1.1 millimeter. Most applications use 4-6 decimal places.

Can I convert WGS84 coordinates to my local coordinate system?

Yes, many online conversion tools and GIS software can convert between WGS84 and local coordinate systems. This conversion requires knowing your specific local datum or projection system.

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Sources

  1. USGS - GPS Coordinates FAQ Public Domain
  2. Wikipedia - ISO 6709 Standard Geographic Coordinates CC-BY-SA-3.0