Traverse Closure Calculator
Enter bearing + distance legs, get departures/latitudes, coordinates, misclosure and linear precision (1:n) — classic closed-traverse computation.
Traverse legs (whole-circle bearing + distance)
Field guide: Traverse Closure Calculator
A closed traverse is surveying's built-in lie detector: walk a loop of bearing-and-distance legs and the coordinates must return to the start — the amount by which they don't (the misclosure) measures the work's quality as a precision ratio of 1:n. This calculator does the classic computation sheet live: each leg's departure (ΔE = d·sin θ) and latitude (ΔN = d·cos θ), running coordinates, and the closure verdict color-coded against the conventional thresholds (1:5,000 for ordinary boundary work, 1:10,000+ for control).
Bearings enter as whole-circle (WCB, 0–360° clockwise from north) — convert quadrantal bearings (N 30° E = 30°, S 45° E = 135°) before entry. When the precision passes spec, distribute the misclosure by the Bowditch (compass) rule the note describes; when it fails, the running-coordinate table is your debugger: a single blundered leg usually reveals itself as a misclosure whose bearing matches that leg's direction.
Field tips
- A misclosure direction that parallels one leg's bearing points the finger at that leg's distance; perpendicular suggests its bearing.
- Check the angle sum first on theodolite traverses — (2n−4)×90° for interior angles — before blaming taped distances.
- Enter legs in walked order; the table's running E/N is meaningful only as a sequence.
Records are stored only in this browser (localStorage) — export regularly. This tool aids field documentation; it does not replace your agency's official inspection procedures or engineering judgment.
Traverse Closure Calculator — Enter bearing + distance legs, get departures/latitudes, coordinates, misclosure and linear precision (1:n) — classic closed-traverse computation. Free, offline-first and GPS-aware: open it on any phone, log in seconds, and hand your GIS team clean GeoJSON.
About Traverse Closure Calculator
A closed traverse is surveying's built-in lie detector: walk a loop of bearing-and-distance legs and the coordinates must return to the start — the amount by which they don't (the misclosure) measures the work's quality as a precision ratio of 1:n. This calculator does the classic computation sheet live: each leg's departure (ΔE = d·sin θ) and latitude (ΔN = d·cos θ), running coordinates, and the closure verdict color-coded against the conventional thresholds (1:5,000 for ordinary boundary work, 1:10,000+ for control).
How to use Traverse Closure Calculator
- 1Open the tool — it loads instantly and runs entirely in your browser.
- 2Enter or import your field data; everything stays on your device.
- 3Review the computed results and flagged items.
- 4Export to CSV/GeoJSON or print a report for stakeholders.
Why use Traverse Closure Calculator?
- ✓100% free, no sign-up — built for crews, not per-seat licences
- ✓Offline-first: records save to your device instantly and survive dead zones
- ✓One-tap GPS tagging with accuracy capture on every record
- ✓Exports CSV for asset systems, GeoJSON for GIS, and print-ready reports
- ✓Checklist and guidance aligned with Surveying textbooks
Frequently asked questions
What precision ratio is acceptable?+
Convention by purpose: 1:1,000–1:3,000 for rough/compass traverses, 1:5,000 for ordinary property work, 1:10,000+ for engineering control, higher for geodetic densification. The ratio = total traverse length ÷ linear misclosure. Specs vary by jurisdiction — many boundary regulations write 1:5,000 or 1:7,500 into law.
How does the Bowditch (compass) rule adjustment work?+
It distributes the misclosure proportionally to leg lengths: correction to a leg's departure = −(total ΔE) × (leg length / total length), and likewise for latitude. It assumes angular and linear precision are comparable — the right default for tape-and-compass and most total-station traverses. The transit rule (proportional to departures/latitudes themselves) suits angle-dominant accuracy.
What's the difference between departure and latitude?+
Per-leg coordinate changes: departure is the east-west component (ΔE = distance × sin bearing), latitude the north-south (ΔN = distance × cos bearing) — nothing to do with geographic latitude. Summing them gives running coordinates; their loop totals SHOULD be zero, and aren't — that residual is the misclosure this tool reports.
Can I use this for an open (link) traverse?+
The departures/latitudes and running coordinates are equally valid — what disappears is the closure check, since an open traverse doesn't return to start (closing onto a second known point restores a check; compare the computed end against its known coordinates). For pure open traverses, the table is computation without verification: measure twice.
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