2.6 Cadastral Field Workflows and Record Keeping
Key Takeaways
- Cadastral (boundary) surveys retrace property lines using evidence: found monuments, record deeds/plats, and the hierarchy of calls (senior rights, monuments, then bearings and distances).
- The PLSS divides land into 6-mile townships and 1-mile-square sections (~640 acres), with corners that are retraced, not recreated, by the surveyor.
- Original physical monuments control over record measurements when they conflict; the surveyor follows the footsteps of the original survey.
- Defensible field notes, monument descriptions, ties, and a sealed plat are the permanent legal record of a boundary survey.
Cadastral Surveys: Retracing, Not Recreating
Cadastral (boundary) surveying establishes, retraces, or documents the limits of real property. Unlike a topographic survey, it is governed as much by law and evidence as by measurement: the surveyor's job is to locate where a boundary already is based on the original survey and the chain of title, not to invent a mathematically tidy line. The guiding principle is to follow the footsteps of the original surveyor.
Evidence is weighed in a recognized priority of calls when descriptions conflict:
| Priority (highest first) | Element |
|---|---|
| 1 | Senior rights (earlier conveyance prevails) |
| 2 | Written intentions of the parties |
| 3 | Calls for natural monuments (rivers, lakes) |
| 4 | Calls for artificial monuments (set pins, original corners) |
| 5 | Calls for adjoiners |
| 6 | Courses (bearings) and distances |
| 7 | Area (acreage), lowest |
A frequent FS point: when an original physical monument conflicts with a record bearing and distance, the monument controls, because it is the best evidence of where the original line was actually run.
The PLSS Framework
Most public-land states use the Public Land Survey System (PLSS), a rectangular framework run from an initial point with a principal meridian (north-south) and a baseline (east-west). The land is divided into:
- Townships — nominally 6 miles × 6 miles, located by township (north/south of baseline) and range (east/west of the principal meridian).
- Sections — each township is divided into 36 sections, numbered 1–36 in a boustrophedon (back-and-forth) pattern starting in the NE corner.
- A standard section is 1 mile square ≈ 640 acres; a quarter-quarter (e.g., the NE¼ of the NW¼) is about 40 acres.
Because meridians converge and original chains were imperfect, sections are not exactly 640 acres; government lot and aliquot descriptions account for the irregularities along the north and west tiers. The retracing surveyor recovers existing corners — corner monuments, accessories, and bearing trees — and re-establishes lost corners by proportionate measurement only when the original position truly cannot be recovered. A corner is obliterated (recoverable from evidence) versus lost (no evidence) — a distinction the FS exam tests.
Field Workflow and Record-Keeping
A boundary field workflow proceeds from research to evidence to documentation:
- Research the deed, plat, prior surveys, and adjoiner records.
- Recover monuments — search for original corners and reference (witness) ties; record what is found versus set.
- Measure the recovered evidence with control-grade methods and tie found monuments to your control and to each other.
- Analyze discrepancies using the priority of calls and senior rights; resolve gaps and overlaps.
- Document the result.
Record-keeping is the legal product of the survey. Defensible field notes capture each monument's description, condition, and ties, the measurements, the date and crew, and the reasoning behind boundary decisions. The deliverable is typically a plat or map of survey bearing the surveyor's seal and signature, recorded per state law, plus a written legal description. The FS exam consistently rewards answers that honor original monuments and senior rights and that treat thorough, reproducible records — not the tidiest math — as the basis of a defensible boundary.
An original iron pin set by the first surveyor is found, but it disagrees with the deed's record bearing and distance. Which controls the boundary?
In the PLSS, a standard section is approximately:
Sections within a PLSS township are numbered 1 through 36 in what pattern?
A corner for which no physical evidence or reliable testimony survives, requiring re-establishment by proportionate measurement, is termed:
Evidence, Conflicts, and Defensible Decisions
Boundary determination is an exercise in evidence, and the FS exam tests how a surveyor reconciles conflicting evidence rather than simply trusting a measurement. Original monuments — set when the line was first run — are the strongest physical evidence and are held even when they disagree with record bearings and distances. Found monuments must be evaluated for whether they are original, perpetuated, or spurious; a pin of unknown origin is weighed against the record and adjoining occupation.
| Evidence type | Weight in retracement |
|---|---|
| Original monument | Highest physical evidence; held over record measurements |
| Found accessory / bearing tree | Locates an obliterated corner |
| Occupation (fences, use) | Supports intent; may raise unwritten rights |
| Record bearing/distance | Used to compute, but yields to monuments |
The surveyor also recognizes legal doctrines that affect lines on the ground — senior rights (the earlier deed prevails where parcels overlap), and unwritten conveyances such as adverse possession or acquiescence, which a surveyor reports as evidence even though only a court resolves title. Every judgment must be documented: thorough field notes, a record of what was found versus set, ties to control and to adjoiners, and the reasoning behind each boundary decision.
The sealed plat and written legal description — not the tidiest geometry — are the defensible product, and an FS answer that subordinates measurement to monuments, senior rights, and recorded evidence is the answer the exam rewards.
The Surveyor's Role Versus the Court's
A boundary surveyor locates and reports evidence of where lines are; only a court can ultimately adjudicate disputed title. This boundary on authority is itself tested: a surveyor honors original monuments, senior rights, and the record, and flags unwritten-rights evidence (occupation, acquiescence, adverse possession) without unilaterally moving a line based on it.
The defensible product — sealed plat, written legal description, and complete field notes documenting found-versus-set monuments and the reasoning behind each decision — is what lets another surveyor or a court retrace the same conclusion, which is the ultimate test of a cadastral survey.