Outdoors & maps
tools and calculators.
12 practical tools with clear inputs and explanations. Choose a tool below, or explore a role-based toolbox for a collection that fits your day.
GeoJSON structure inspector
Inspect geometry counts, position ranges and common structural errors locally.
GeoJSON points to CSV
Extract Point and MultiPoint coordinates into an ordinary downloadable table.
Manning open-channel flow
Estimate uniform flow in a rectangular or trapezoidal channel.
Open-channel Froude number
Compare flow speed with the shallow-water gravity-wave scale.
Latitude & longitude format
Translate signed decimal coordinates and degrees, minutes and seconds.
Great-circle distance & bearing
Compare two coordinates using a spherical Earth model.
Coordinate from distance & bearing
Find a spherical destination from a starting point and initial bearing.
Coordinate route distance
Add spherical leg distances along an ordered list of coordinates.
Latitude–longitude rectangle area
Estimate the spherical surface area inside geographic bounds.
Web Mercator coordinate converter
Convert decimal coordinates to or from EPSG:3857 map metres.
Geometric horizon distance
Estimate an unobstructed horizon from height above a spherical surface.
Walking & ascent time planner
Combine your walking pace, ascent allowance and planned breaks.