gpx-fixer

gpx-fixer is a small Go library for reading GPX activity files, building a time series ("stream") of track points, and exporting a cleaned GPX track. It computes distance, elevation-adjusted distance, pace, and aggregates (time, distance, climb), and filters out implausible points (e.g., pace faster than world-record marathon pace).

This repository is primarily a library; main.go is currently empty. Sample GPX inputs live in external/, and tests validate the calculations.

How it works

• Parse GPX: Uses github.com/sudhanshuraheja/go-garmin-gpx to load tracks and track points.
• Stream building: Each GPX point becomes a Drop in a Stream, carrying metrics like timestamp, distance, pace, temperature, heart rate, and cadence.
• Validation: Drops with a pace faster than 2.9139 min/km are rejected.
• Write GPX: The stream can be exported as a new GPX file (written to out.gpx via the out base name).

Packages

• geo: Geographic helpers, including 2D and elevation-adjusted distance calculations.
• stream: Stream ingestion, derived metrics, validation, and GPX export.

Example

package main

import (
	"log"

	"github.com/sudhanshuraheja/gpx-fixer/stream"
)

func main() {
	s := stream.Stream{}
	if err := s.Load("external/strava-ADHM-2014.gpx"); err != nil {
		log.Fatal(err)
	}

	if err := s.WriteToGPXFile("fixed"); err != nil {
		log.Fatal(err)
	}
}

Tests

make test

This runs unit tests for the geo package and integration-style checks over the sample GPX files in external/.