Corner

Definition

In surveying, a corner is a specific point where two boundary lines meet or intersect, forming an angle. Corners are fundamental reference points used to establish and define property boundaries, parcels of land, and geographic features. They serve as vertices of polygonal boundary descriptions and are essential for accurate land measurement and documentation.

Types of Corners

Original Corners

These are corners that were established during the original survey of a property or region. They hold historical significance and are often used as reference points for subsequent surveys. Original corners may be marked by monuments, natural features, or documented positions.

Established Corners

Corners that have been set or re-established during a survey process, often marked with physical monuments such as stone, metal, or concrete markers. These corners provide visible reference points for property boundaries.

Lost Corners

Corners whose original monuments or markers have been destroyed, removed, or cannot be located. Surveyors must use other evidence and methods to recover or re-establish the location of lost corners.

Proportional Corners

Corners set proportionally along a boundary line when original corner locations cannot be determined with certainty. They are placed according to accepted proportional measurement principles.

Marking and Monumentation

Corners are typically marked using various methods depending on the application and permanence requirements:

Stone monuments: Traditional, durable markers used for long-term boundary identification

Metal monuments: Iron or aluminum pipes and caps for clear identification

Concrete monuments: Modern, durable markers often embedded in ground

Natural features: Trees, rocks, or water features may serve as corner markers

Witness markers: Secondary markers placed near corners to aid in recovery

Documentation

Precise corner locations must be documented through:

Coordinates: Latitude, longitude, or state plane coordinates

Distances: Measured distances from reference points

Bearings: Directional angles from established points

Description: Written documentation of corner location and identification

Photographs: Visual records of corner markers and surrounding features

Importance in Surveying

Corners are critical to:

Boundary establishment: They define the extent and limits of property

Legal documentation: Corners are referenced in deeds and legal descriptions

Engineering projects: They provide reference points for construction and development

Land division: Corners enable accurate subdivision of larger parcels

Map creation: They serve as control points for geographic mapping

Corner Recovery

When original corners cannot be located, surveyors employ various recovery techniques:

Analyzing historical records and previous survey documents

Examining physical evidence and remaining monuments

Applying proportional measurement methods

Conducting searches in likely locations based on description

Using witness testimony and local knowledge

Modern Technology

Contemporary surveying uses advanced technology to identify and document corners:

GPS and GNSS systems for precise positioning

Total stations for accurate distance and angle measurement

GIS mapping for digital corner documentation

Laser scanning for three-dimensional corner identification

Legal Considerations

Corners have significant legal implications in property disputes and boundary controversies. Survey-established corners must comply with state and local regulations, and corner evidence is often critical in boundary litigation.

Conclusion

Corners represent essential points in the surveying discipline, serving as the foundation for accurate land measurement, legal property description, and boundary establishment. Their proper identification, documentation, and preservation are fundamental responsibilities of professional surveyors.