Mapping, Platting, and Subdivision
This domain tests whether a plat is a legally sufficient instrument and a geometrically sound map: closure, dedication, monumentation, and consistency with deeds and ordinances.
Plat content and approval
A subdivision plat identifies the subdivision, dedicates streets and easements, shows lot lines, dimensions, bearings, curve data, and monument positions, and carries the surveyor's seal and signature. Oklahoma plats are approved through municipal or county procedures before recording; approval and recording are separate steps. Dedicated rights-of-way transfer the public interest; utility easements do not.
Map accuracy
Show the basis of bearings, the source of control, and the area of each lot and the tract. Lot areas must reconcile with the boundary geometry; a closure error that is acceptable in a traverse may still be unacceptable on a plat face.
Worked example
A 660-ft-wide tract 1,320 ft deep contains 871,200 ft² = 20.00 acres. A 60-ft street dedication running the full 1,320-ft depth removes 60 × 1,320 = 79,200 ft² = 1.818 acres. Net developable area = 20.00 − 1.818 = 18.18 acres. If the dedication runs across the 660-ft width instead, only 0.909 acre is removed.
Traps
Plat dimensions that do not match the deed; ignoring a half-width right-of-way call; forgetting existing easements and floodplain; missing curve data (delta, radius, arc, chord); signing a plat without responsible charge; treating a record of survey as an approved subdivision plat.