GPX to KML Converter
Convert GPS track logs (GPX) into Google Earth KML files with full 3D elevation profile support.
The GPX to KML Converter transforms GPS Exchange Format (.gpx) activity trails, waypoints, and hiking tracks into Google Earth Keyhole Markup Language (.kml) files with full elevation profile support and 3D path visualization.
GPX to KML Technical Specifications & Standards
WGS84
Standard global ellipsoidal coordinate reference system
GPX Geodesics
Sub-meter horizontal and vertical precision
GeoJSON · KML · CSV · SVG
Compatible with QGIS, ArcGIS, Google Earth & CAD
100% Client-Side
Calculations run in-browser. Zero coordinate logging.
How to Use the GPX to KML Converter
Follow this step-by-step procedure to execute precise spatial measurements and export results.
- 1Upload GPX file: Select a GPX file from your Garmin, Strava, or GPS device.
- 2Parse track points: The converter extracts <trkpt> latitude, longitude, and elevation nodes.
- 3Review 3D path: Inspect the generated KML LineString coordinates with altitude data.
- 4Download KML: Download the file and open it in Google Earth for 3D elevation fly-throughs.
Geodesic Precision vs. Competitor Mapping Approaches
Most legacy mapping utilities (such as CalcMaps and FreeMapTools) rely on planar Web Mercator projections or spherical approximations, causing significant mathematical distortion at higher latitudes. GeoMap Suite computes exact ellipsoidal geodesics on the WGS84 reference ellipsoid.
| Calculation Model | Mathematical Basis | Distortion on WGS84 | Standard Tools | Practical Application |
|---|---|---|---|---|
| Planar (Web Mercator) | Cartesian dx² + dy² | 10% to 200%+ error | CalcMaps / Simple map tools | Distorts drastically away from equator. Inaccurate for true distance. |
| Spherical Great-Circle | Haversine (R = 6,371 km) | Up to 0.5% (~5 km/1,000 km) | Basic Google Maps wrappers | Ignores Earth's polar flattening. Reasonable for rough estimates. |
| GeoMap Suite Ellipsoidal | Karney Direct/Inverse WGS84 | < 15 nanometers (<0.0001%) | GeoMap Suite | Geodetic surveying, maritime, flight paths & legal boundary analysis. |
Worked Example: Converting a Mountain Hike GPX to Google Earth KML
A trail runner converts a Garmin GPX trail recording of Mount Rainier into Google Earth KML.
Input Parameters
- Input GPX
- 1,200 track points (<trkpt lat="46.85" lon="-121.76"><ele>2400</ele></trkpt>)
Computed Outputs
- Total Track Points
- 1,200 track points
- Output Format
- 3D KML LineString
- Google Earth 3D
- Clamps accurately to 3D mountain terrain
Step-by-Step Mathematical Process
- Parse GPX XML DOM tree.
- Extract lat, lon, and elevation for every track point.
- Convert to KML 3D coordinate string: "-121.76,46.85,2400 -121.761,46.851,2410 ..."
- Wrap in KML LineString with <altitudeMode>absolute</altitudeMode>.
Understanding Your Results & Practical Interpretation
3D Elevation Handling
Elevation data (<ele> in meters) from your GPS barometric altimeter is written directly to the third coordinate coordinate element in KML (longitude, latitude, altitude).
Practical Applications & Real-World Use Cases
Outdoor Recreation & Hiking
Fly over your hiking or mountaineering routes in Google Earth 3D.
Mathematical Methodology & Geodetic Accuracy
GPX 1.1 to KML 2.2 Schema Transformation
Translates GPX track segments (<trkseg>/<trkpt>) and waypoints (<wpt>) into KML Document Placemarks.
GPX XML -> Parse(trkpt[lat, lon, ele]) -> KML(LineString[lon, lat, ele])Limitations & Boundary Conditions
- •Heart rate and cadence extension data from Garmin FIT/GPX files are omitted in basic KML.
Authoritative Reference Standards
Troubleshooting & Geographic Edge Cases
Why does my track appear under the ground in Google Earth?
In Google Earth, set altitude mode to "Clamped to ground" if your GPS elevation recorded slight satellite atmospheric errors.
Frequently Asked Questions
GPX is tailored for GPS navigation hardware and fitness watches (recording sequential trackpoints with timestamps and heart rate). KML is designed for Google Earth rich visual mapping, 3D terrain draping, and styling.