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metrictrails: Processing of GNSS Streams from Sports Watches

Tools to read, clean and standardise GNSS (Global Navigation Satellite System) streams recorded by sports watches and similar devices, with a focus on trail and mountain running. The pipeline reads GPX files, applies a naming convention, sanitises coordinates (Kalman, LOESS, Gaussian kernel or Savitzky-Golay smoothing, and red flags for implausible readings), resamples the trajectory to a uniform spatial resolution derived from the Nyquist criterion, and replaces elevation with values from a Digital Elevation Model. Derived measures include speed, slope, elevation gain and kilometre-effort, Tobler hiking function parameters fitted by quantile regression, comparison between streams, detection of passes along a route and map matching to a known reference trail by dynamic programming. Methods follow Sanchez and Villena (2020) <doi:10.1177/1754337120918975>, Sanchez et al. (2024) <doi:10.1109/ICECET61485.2024.10698606>, Sanchez et al. (2025) <doi:10.1177/17543371251341660> and Martinez, Sanchez and Diaz (2026) <doi:10.1109/ICECET65726.2026.11632531>.

Version: 1.0.0
Depends: R (≥ 4.1)
Imports: magrittr, sf, stats, terra, tibble, utils
Suggests: curl, knitr, rmarkdown, testthat (≥ 3.0.0)
Published: 2026-10-21
DOI: 10.32614/CRAN.package.metrictrails
Author: Raimundo Sanchez ORCID iD [aut, cre]
Maintainer: Raimundo Sanchez <raimundosanchezu at gmail.com>
BugReports: https://github.com/raimun2/metrictrails/issues
License: MIT + file LICENSE
URL: https://github.com/raimun2/metrictrails
NeedsCompilation: no
Citation: metrictrails citation info
Materials: README
CRAN checks: metrictrails results

Documentation:

Reference manual: metrictrails.html , metrictrails.pdf
Vignettes: From a GPX file to research-grade trail measures (source, R code)

Downloads:

Package source: metrictrails_1.0.0.tar.gz
Windows binaries: r-devel: not available, r-release: not available, r-oldrel: metrictrails_1.0.0.zip
macOS binaries: r-release (arm64): metrictrails_1.0.0.tgz, r-oldrel (arm64): metrictrails_1.0.0.tgz, r-release (x86_64): metrictrails_1.0.0.tgz, r-oldrel (x86_64): metrictrails_1.0.0.tgz

Linking:

Please use the canonical form https://CRAN.R-project.org/package=metrictrails to link to this page.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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