tracklog

A tracklog is a digital record of a journey or path created by logging a sequence of geographic positions over time. It is commonly produced by GPS receivers, smartphones, fitness devices, vehicle telematics, or survey instruments. Tracklogs are used for navigation, mapping, performance analysis, and research, and may be stored in formats such as GPX, KML, TCX, CSV, or proprietary types.

A typical tracklog consists of records, each containing a timestamp and coordinates (latitude and longitude) and often altitude, speed, heading, and an accuracy measure. Some logs include extra sensor data such as heart rate or cadence. The sampling rate determines how often positions are recorded, affecting detail and file size.

Uses include reconstructing routes, calculating distance and elevation gain, and plotting trajectories on maps. They support geospatial analyses in fields like sports analytics, transportation, and movement ecology, as well as fleet management and route optimization.

Formats include GPX and TCX for training data, KML for visualization, CSV for analysis, and NMEA for navigation equipment. Interoperability varies; metadata such as time zones, coordinate reference frame, and device clock accuracy influence data quality.

Privacy and ethics: tracklogs can reveal sensitive movement patterns; access should be controlled, and anonymization or consent considered when sharing data.

History: Digital tracklogs emerged with GPS in the late 20th century and have become common in consumer devices and professional equipment.