PS Exam Preparation

Comprehensive preparation for the NCEES Principles and Practice of Surveying (PS) exam. 5 modules covering all 5 exam domains with 50 in-depth topics.

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Lesson 5

Boundary Surveys & Reconciliations

Learning Objectives

After completing this topic, you should be able to:

Describe the process of searching for and evaluating physical evidence of boundaries
Explain how to reconcile conflicting evidence from different sources
Understand historical measurement accuracy and its impact on retracement surveys
Apply legal principles governing boundary location and retracement
Describe the hierarchy of evidence in boundary determination
Explain the concept of following in the footsteps of the original surveyor
Identify common sources of boundary disputes and their resolution

Overview

Boundary surveying is the core practice area that distinguishes a professional land surveyor from other measurement professionals. The boundary surveyor's task is not merely to measure distances and angles but to determine the location of property boundaries based on the available evidence -- physical, documentary, and testimonial. This requires the integration of legal knowledge, field investigation skills, historical awareness, and professional judgment.

The PS exam tests boundary surveying heavily because it synthesizes legal principles (Module 1), professional practices (Module 2), and fieldwork into the definitive act of the surveying profession: locating the boundary on the ground.

Key Concepts

Figure PS.5.5 — Boundary Retracement Process

Physical Evidence of Boundaries

The first and most important step in a boundary survey is the search for physical evidence. Physical evidence includes:

Original monuments:

Stone markers, iron pipes, iron rods, concrete monuments
Bearing trees, witness trees, mound and pit markers
Natural monuments (rivers, ridges, shorelines, rock outcrops)
Called-for monuments (objects specifically described in the deed or plat)

Accessory evidence:

Fence lines (may indicate long-standing boundary occupation)
Walls and hedgerows
Occupation lines (mowed areas, maintained boundaries)
Witness corners and reference monuments
Survey markers set by previous surveyors

Improvements and use patterns:

Building locations relative to described boundaries
Driveways, sidewalks, and paved areas
Agricultural use patterns (crop rows, field edges)
Utility alignments that follow property boundaries

Evidence Evaluation and Hierarchy

The surveyor must evaluate evidence within a legal framework. The general hierarchy of controlling elements (from most to least authoritative) is:

Natural monuments -- Rivers, lakes, ridges, trees called for as corners
Artificial monuments -- Iron pipes, stones, stakes set by the original surveyor
Adjoiners and record boundaries -- Boundaries of adjacent properties
Courses (bearings/directions) -- Direction calls in the deed
Distances -- Distance calls in the deed
Area -- Acreage calls (least controlling)

This hierarchy is not absolute. The weight given to each type of evidence depends on the specific facts of the survey. A well-established artificial monument may control over a poorly defined natural feature.

Reconciliation of Conflicting Evidence

Boundaries rarely close perfectly. The surveyor must reconcile:

Record vs. measured:

Deed calls may not match current measurements due to original surveyor's methods, instrument accuracy, or changes in the physical landscape
The surveyor must determine whether discrepancies are within the range of the original measurement accuracy or indicate a genuine problem

Monument vs. measurement:

When a monument is found that does not agree with the called-for distance or bearing, the monument generally controls (absent evidence that it is not the original monument)
The surveyor must evaluate whether the monument is original, undisturbed, and properly identified

Adjoining surveys vs. subject survey:

Boundaries common to adjacent properties must be consistent
Senior rights (earlier conveyances) generally prevail over junior rights
Overlaps and gaps between descriptions must be resolved using the rules of construction

Multiple deed calls:

When a deed contains conflicting calls, the hierarchy of controlling elements guides resolution
Specific calls control over general calls
Definite calls control over indefinite calls

Historical Measurement Accuracy

Understanding the accuracy of historical surveys is critical to proper retracement:

Era	Instruments	Typical Accuracy
Colonial (1600s-1700s)	Chain, compass	Bearings: 1-2 degrees; Distances: 1:50 to 1:100
Early American (1800s)	Improved compass, Gunter's chain	Bearings: 30 minutes; Distances: 1:100 to 1:300
Transit era (1850s-1950s)	Transit, steel tape	Bearings: 1-5 minutes; Distances: 1:3,000 to 1:10,000
Modern (1950s-present)	Theodolite, EDM, total station	Bearings: 1-10 seconds; Distances: 1:10,000 to 1:100,000+
GPS/GNSS (1990s-present)	GNSS receivers	Sub-centimeter to centimeter

Why this matters:

A deed from 1850 calling for a bearing of N 45 E may have been measured with a compass accurate to only one degree
The retracing surveyor must not reject a found monument simply because it does not fall on the exact bearing called in the deed, if the discrepancy is within the accuracy range of the original instrument
Holding a modern measurement to exactly match a historical call may produce an incorrect boundary

Retracement Principles

A retracement survey follows these fundamental principles:

Follow the footsteps of the original surveyor:

The retracing surveyor's job is to locate the boundary where the original surveyor placed it, not to establish a new boundary
If the original monuments can be found, they control regardless of whether the modern measurement matches the record call

Do not create new boundaries:

A retracement surveyor has no authority to establish new boundaries
Only the property owner (through agreement or conveyance) or a court can change a boundary
The surveyor renders a professional opinion about where the boundary is located

Give effect to the intent of the parties:

The boundary should be located where the original parties intended it to be
Intent is gathered from the deed language, the physical evidence, and the surrounding circumstances

Evaluate all available evidence:

No single piece of evidence should be accepted or rejected without considering all other evidence
The surveyor must weigh each piece of evidence according to its reliability and relevance

Common Boundary Disputes

Encroachments:

A structure or improvement that crosses the boundary onto neighboring property
Surveyors identify encroachments; courts resolve them
The surveyor should document the encroachment's location, extent, and apparent age

Gaps and overlaps:

Occur when adjacent deed descriptions do not align
Gaps: A strip of land not described in any deed
Overlaps: The same strip described in two or more deeds
Resolution depends on senior/junior rights, original intent, and unwritten rights

Ambulatory boundaries:

Water boundaries that move with accretion, erosion, or reliction
The boundary moves with gradual natural changes but not with sudden changes (avulsion)

Common wrong path — treating a retracement as a redesign. The retracing surveyor's only job is to locate the boundary where the original surveyor placed it. That means following original monuments, applying rotation/scale corrections derived from found monuments, and using proportioning only as a last resort for truly lost corners. Students with engineering-or-construction instincts sometimes "improve" the original by applying modern precision to correct bearings or distances — in effect, creating a new boundary that is mathematically more precise but legally wrong. The original survey, regardless of its precision, created the property; the retracement merely locates it. Exam questions bait this trap by showing a found monument 1.5 ft from the calculated position and asking what controls — the answer is always the monument, provided it is called for, identifiable, and undisturbed. Modern measurements do not correct the original surveyor; they describe the present position of the original corner in modern coordinates.

Quick retrieval check — try before reading on.

▶An 1875 deed calls "N 45° 00' E, 800 feet to an iron post." The post is found, clearly original (matching character, weathered, with bearing-tree stump nearby). Your measurement from the POB gives N 45° 42' E, 803.20 ft to the post. What do you report as the bearing and distance of this line on your plat?

Report the measured values (N 45° 42' E, 803.20 ft) — not the record values — because the monument controls. The bearing and distance on the plat reflect what you actually measured; the record call is shown separately in a "record vs measured" table or in parentheses. The 42' bearing variation and 3.2 ft distance variation are within expected 1875 compass-and-chain accuracy, so the monument is almost certainly original and controls. You should NOT report N 45° 00' E / 800.00 ft — that would misrepresent your measurements. And you should NOT split the difference or adjust — the monument defines the line.

Unwritten rights:

Adverse possession, prescriptive easements, boundary by acquiescence, and practical location can modify written boundaries
The surveyor should be aware of potential unwritten rights but typically cannot make the legal determination

Boundary Survey Deliverables

A boundary survey typically produces:

Survey plat/map showing boundaries, monuments, bearings, distances, and area
Legal description (if new or revised)
Boundary analysis narrative explaining the surveyor's reasoning and evidence evaluation
Monument records documenting what was found, set, and referenced
Title report review noting any exceptions that were or could not be plotted

Exam Tips

The hierarchy of controlling elements (natural monuments, artificial monuments, adjoiners, courses, distances, area) is one of the most tested concepts on the PS exam
Remember: the retracing surveyor follows the footsteps of the original surveyor -- you are finding an existing boundary, not creating a new one
Historical measurement accuracy matters: do not reject a found monument because it does not match a historical call to modern precision
Natural monuments control over artificial monuments, which control over courses, which control over distances, which control over area
When deed calls conflict, specific calls control over general calls, and definite calls control over indefinite calls
The surveyor renders an opinion about the boundary location; only a court can establish a boundary when parties disagree
Senior rights (first in time) generally prevail over junior rights in overlap situations
Ambulatory water boundaries move with gradual natural changes but not with sudden avulsive changes

PS Exam Preparation

Module 1: Legal Principles

Module 2: Professional Survey Practices

Module 3: Standards & Specifications

Module 4: Business Practices

Module 5: Areas of Practice