Parallel Maps

Colour trails by

Hide roads and sidewalks

Terrain character

Parallel Maps' own read of the ground, from public lidar and imagery: how rough, steep, enclosed and wet each 50 m of trail is. Computed for a few areas so far.

Plan a route

Travelling by Prefer trails: a road only where nothing else links Snap to trails and roads

Click along the trails to build a route. It snaps to the network and measures as you go. Trails closed to your way of travelling are marked with red crosses and left out of routes.

Other maps

Same spot on other sites. Nothing is copied — each opens on its own site, in your session.

Side by side: opened windows follow this map

About the data

sources & methods

Trails and tags — OpenStreetMap (ODbL). Surface, access and difficulty tags feed the verdicts; the lines feed the router.
Elevation and grade — USGS 3DEP lidar, 1 m where flown. Smoothed over 25 m; the headline grade is the steepest 100 m.
Terrain character — computed by Parallel Maps from 3DEP, USDA NAIP 0.6 m imagery and USGS hydrography, per 50 m of trail. Public-domain inputs only; the satellite basemap is never read.
Good for — access and surface from OSM, grade and roughness from terrain character where computed. Each row shows its sources.
Search, weather, daylight — Photon, the National Weather Service, sunrise-sunset.org.

Where every number comes from, and what it cannot tell you →