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Analytical utility - final geodetic validation is the statutory responsibility of the Licensed Professional Land Surveyor. Data is processed locally and never uploaded.

Validation map

Load a survey file to see the live validation map

Points0 shown

No points loaded.

Source CRS / ingestion status

Drop a field file to inspect source CRS metadata and reduced-grid safety.

Target coordinate system

SPCS2022 / NATRF2022 preliminary

NAD83(2011) - Lambert Conformal Conic - units in US survey feet.

Ground-to-grid localization

4-parameter 2D conformal transform: $X = X_s + s(x\cos\theta - y\sin\theta),\; Y = Y_s + s(x\sin\theta + y\cos\theta)$

Combined scale (s)

Rotation θ

deg

Shift East

Shift North

Combined scale factor

Unavailable until source and target CRS are verified and coordinates pass the target zone guard.

Input height is ellipsoid h

Leave off for NAVD88/orthometric elevation H so GEOID18 N is applied.

Orthometric elevation (H)

Geoid separation (N)

Load a job to auto-fill N from GEOID18.

Elevation factor: —
Grid factor (centroid): —

Derived from the target zone grid factor at the survey centroid and ellipsoid height h. If you enter orthometric elevation H, FieldToCAD computes h = H + signed GEOID18 N.