Survey Correction Tool

Tie Line

Monument / Reference Point

Monument Northing (N)

Monument Easting (E)

Bearing (Mon → POB)

° ' "

Distance (m)

N = — | E = —

Traverse Data Enter bearing and distance for each course

Starting Northing (N)

Starting Easting (E)

Projection (for Map View)

Zone (for Map View)

#	Bearing	Distance (m)	Delete

Review Scanned Rows

Compare each cropped cell against the photo and correct any field below. Nothing is added to Traverse Data until you confirm — these fields are the values that will be used, exactly as shown, with no further OCR or parsing.

Traverse Computation — Transit Rule Check

#	Bearing	Dist. (m)	Latitude	Departure	Corr. Lat	Corr. Dep	Adj. Latitude	Adj. Departure	Adj. Dist. (m)

Total Distance —

Error in Latitude (eL) —

Error in Departure (eD) —

Linear Error —

                Precision Ratio
                —
            

                Total Area
                —
            

Station Coordinates

Station	Northing (N)	Easting (E)	Easting,Northing

Lot Drawing

Split this lot into multiple sub-lots, export it to CAD, or view it on the map

Target Area Adjustment

Title / Desired Area (sqm)

Traverse Reconstruction Engine

Recovers missing bearing seconds and fine-tunes distance by millimetres, scored against whole-traverse closure — fails honestly rather than forcing a fake close.

How this works & options

Many titles state bearings without seconds at all ("S 47° 2' E"). Seconds are treated as a genuine UNKNOWN (never assumed to be 0") and resolved by GLOBAL coordinate descent: every unknown line's full 0"–59" is swept against the WHOLE traverse's final closure back to its own known start point (never against intermediate "reference" points, since those are normally just re-plotted from this same TD and would make the check circular). Distance is a LAST RESORT, not a routine polish: a strict, non-expanding ±mm distance pass only runs at all if seconds/minutes alone don't already close within tolerance, since touching a stated distance is a bigger deal than filling in a genuinely unknown second. If most lines' nudges land exactly on the ±mm bound, that means the optimizer wanted to push further, not that it found a genuine correction — that result is rejected and the seconds-only closure is kept instead. Tolerance is whichever is LOOSER of a flat mm floor or a closure ratio (real surveys are judged by ratio, e.g. 1:10,000 — a flat mm number means something different on a 50m lot than a 5km one). If Advanced Mode is on and seconds alone can't close it, the engine tries nudging exactly ONE line's minute (exhaustively, every line × ±1-3'), and only if that fails, every PAIR of lines together — it never searches 3+ lines moving at once, since a real TD won't have that many independent minute mistakes that happen to also close the shape, so anything needing more is reported as a blunder rather than computed. Results are labeled "Geometry-Consistent," not a verified historical recovery — with several unknowns and only 2 closure equations, more than one combination can close the same shape.

Distance Search Step (mm): Max Distance Search (mm, strict): Tolerance Floor (mm): Tolerance Ratio (1:N): Advanced: also allow minute to vary (±3', single line first, then pairs) Treat every line's seconds as unknown (default: on)

Reference Coordinates (optional — shown side-by-side for your own cross-check only; NOT used in scoring, since these are usually plotted from this same TD): one "Easting, Northing" pair per line, same order as the Station Coordinates table (Point 1 first). Leave blank to just use closure.

Scale Factor: — Adjusted Area: — TD Unchanged: —

Technical Description Check — Input (Title) vs. Adjusted Coordinates · bearing to nearest minute · distance to centimeter

Compares your entered TD (title bearings & distances) against what the adjusted coordinates produce. Adjusted coordinates are computed directly from your input bearings/distances then scaled — so bearings always show ✓. Distances show ✓ when the target area is close to the area implied by your input TD.

Line	Input Bearing	Input Dist.	Adjusted Bearing	Adjusted Dist.	Bearing	Distance

Adjusted Coordinates — showing cm-level shifts per point

Point	Northing	Easting	ΔN (cm)	ΔE (cm)	E,N Combined

From Coordinates Paste Easting, Northing pairs — one per line

                    Total Area
                    —
                

Perimeter —

Station	Northing (N)	Easting (E)	Easting,Northing	Bearing to Next	Distance (m)	Map

Technical Description

#	Line	Bearing	Distance (m)

Split this lot into multiple sub-lots, export it to CAD, or view it on the map

Target Area Adjustment

Target Area (sqm)

Adjusted Technical Description

#	Line	Bearing	Distance (m)

Subdivide Lot

Equal/Proportional Strips Custom Cut (bearing & distance)

Click two points along the lot's boundary below. The line between them sets the direction every dividing line will run — all sub-lots come out parallel to it.

Points chosen: 0/2

Click a point on the lot's boundary below to start the cut.

Snap: Nearest Endpoint (corner) Midpoint

Add segment: ° '

Click a segment above to edit its bearing/distance. Once the cut's bends are laid out, finish with a closing bearing only (distance found automatically) — or if a segment you add already lands on the boundary, it closes automatically.

Close to boundary: ° '

Mother Lot Declared Area (sqm) Defaults to the area computed from your plotted coordinates — edit it if the title declares a rounded figure instead, and sub-lot areas will total exactly this.

Number of Lots

Equally divided Not equally divided

Round lot areas to whole sqm e.g. 10 sqm ÷ 3 lots → 3, 3, and the last lot takes the remainder (4)

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Subdivide Lot

Satellite Map

Advance Technical Description