Transparency
Every trail page shows its official source and last verified date. Here is where the numbers come from and how we check them.
Sentieri VdA is an independent editorial project. We do not invent distances, elevations or grades: we use only traceable data and leave fields empty when they cannot be verified. Narrative descriptions are original but grounded in institutional and open data sources.
Primary source for trail code, name, municipality, length, start/end elevation, CAI grade and official network geometry (~5,000 km). Open data licence DGR 899/2014. Updated periodically via regional WFS/GeoJSON.
Catasto Sentieri VdA →Used to fill missing GPX tracks, toponyms and points of interest along routes. OSM is crowd-sourced: we treat it as a complement, not the sole source for distance or difficulty.
OpenStreetMap →Official trail network package (shapefile/KMZ) and cartographic metadata from the Aosta Valley Region. Used to validate geometries and compare dataset versions.
Geoportale — Trail network →Every curated page in trails.json includes updated_at: the date when distance, elevation, grade and GPX were checked or refreshed. You will find it at the bottom of each trail page, next to the data source.
Trails change: landslides, late snow, diversions. Always check current conditions on the official registry or at the nearest refuge before setting out.
Who runs the project? The project