CO Land Surveyor key terms

A physical object described in a recorded survey, plat, or deed that is accepted as evidence of a boundary corner. Its position, character, and accessories control retracement before measurements are considered.

Physical or documentary indications of an original corner's location, including the monument itself, accessories, bearing trees, mounds, pits, and statements in field notes. Evidence is weighed by reliability, not by convenience.

A natural or artificial object placed near a corner to help identify and relocate it, such as bearing trees, mounds of stone, pits, or scribed marks. Accessories corroborate the monument's identity and position.

A tree marked near a corner, typically blazed and scribed with the corner's designation, bearing, and distance. It serves as an accessory that helps prove the corner's original location when the monument is lost.

A monument placed at a known offset from a corner that cannot be occupied, with recorded bearing and distance to the true corner. It preserves the corner's location without physically marking it.

The process of reestablishing or verifying the location of existing boundary lines and corners from original records and physical evidence. It seeks to follow the original surveyor's footsteps rather than create new lines.

A method of restoring a lost corner by distributing the discrepancy between record and measured distances along the line among the affected parcels. It applies only when the corner is truly lost and no better evidence exists.

A corner whose original position cannot be recovered from physical evidence or reliable testimony. Its location must be reestablished by accepted rules such as proportion or record measurement, depending on the corner type.

A corner whose monument no longer exists but whose position can be recovered from evidence such as accessories, field notes, or testimony. It is not treated as lost and should not be proportioned.

Boundary interests arising from long use rather than written documents, such as adverse possession, prescriptive easements, and boundary by acquiescence. Colorado law recognizes these doctrines under specific statutory and case-law conditions.

Acquisition of title by open, notorious, exclusive, hostile, and continuous possession of another's land for a statutory period. Colorado's period is generally 18 years, with additional requirements for payment of taxes in some cases.

A doctrine fixing a boundary where adjoining owners have treated a line as the boundary for a long period, even if it differs from the record line. Colorado courts require mutual recognition and reliance on the line.

Testimony or statements outside the written record, often used to clarify ambiguous descriptions or to establish unwritten boundary rights. It may be considered when a deed is ambiguous or when unwritten doctrines are asserted.

Legal principles used to interpret deeds and resolve conflicts among calls, such as natural monuments controlling over courses and distances. Surveyors apply these rules when retracing boundaries described in writing.

The principle that an earlier conveyance or survey generally prevails over a later one where the two conflict, to the extent of the conflict. It guides resolution when overlapping descriptions cannot otherwise be reconciled.

A component of a deed description, such as a monument, course, distance, or area, used to locate the boundary. Different calls carry different weight under the rules of construction.

The federal system of subdividing public lands into townships, ranges, sections, and aliquot parts, established by the Land Ordinance of 1785. It provides the cadastral framework for most Colorado land descriptions.

A north-south reference line from which ranges are counted in the Public Land Survey System. Colorado is governed primarily by the Sixth Principal Meridian, with the New Mexico Principal Meridian affecting a small southern area.

An east-west reference line from which townships are counted north and south in the Public Land Survey System. It intersects the principal meridian at the initial point of the survey.

A public land survey unit nominally six miles square, containing 36 sections, identified by its position north or south of the base line and east or west of the principal meridian.

A nominally one-square-mile unit within a township, containing 640 acres, numbered from 1 in the northeast corner serpentine to 36 in the southeast. Sections are subdivided into aliquot parts.

A fractional subdivision of a section created by halving, such as a half-section or quarter-quarter section. Aliquot parts are described by their position within the section, not by metes and bounds.

A fractional parcel within a section that cannot be described as a regular aliquot part, often because of meandered water boundaries or survey irregularities. Its area and boundaries are shown on the official plat.

An east-west line established at intervals in the Public Land Survey System to control measurement errors and confine them to the westernmost and northernmost tiers of sections. It helps keep township lines within acceptable limits.

A traverse line run along the bank of a navigable water body to determine the area of upland, not a boundary of the water itself. It is generally not treated as a boundary in Colorado.

A reference framework defining the size, shape, and orientation of the Earth and the origin of coordinates. NAD83 and NATRF2022 are horizontal datums; NAVD88 is a vertical datum used in Colorado.

A system of projected coordinates designed for surveying and mapping within a state, using zones to limit distortion. Colorado uses a single zone based on the Lambert Conformal Conic projection.

A mathematical transformation from the curved Earth surface to a plane, necessarily introducing distortion. Colorado's State Plane zone uses Lambert Conformal Conic, which preserves angles and shape.

The ratio between a distance on the projection plane and the corresponding distance on the ellipsoid. Combined with elevation factor, it converts between ground and grid distances.

The ratio that reduces a ground distance to the ellipsoid, approximately the Earth's radius divided by the radius plus height above the ellipsoid. It accounts for the survey being above the reference surface.

A height above the geoid, commonly called elevation, as distinguished from height above the ellipsoid. NAVD88 provides orthometric heights used in Colorado surveying and mapping.

A stable monument with a known elevation, used as a reference for vertical control. Benchmarks may be published by NGS or established locally and are tied to a vertical datum.

A survey method that determines point positions by measuring angles and distances along a connected series of lines. Closed traverses allow detection of misclosure and adjustment of coordinates.

The discrepancy between a computed value and its known or expected value in a closed survey. It is compared to allowable tolerances and distributed by an adjustment method.

A statistical method that distributes survey discrepancies by minimizing the sum of squared residuals, producing the most probable coordinates. It also yields precision estimates for adjusted quantities.

The difference between an observed value and its adjusted or computed value. Residuals are used to assess adjustment quality and to detect outliers in survey data.

An electronic instrument combining an angle-measuring theodolite with an electronic distance meter and onboard computing. It measures horizontal and vertical angles and slope distances to targets.

The offset between the physical center of a survey prism and the point to which the distance meter measures. It must be entered correctly to avoid systematic distance errors.

A satellite-based positioning system, including GPS, that provides three-dimensional coordinates. Real-time kinematic methods are widely used for control and topographic surveying in Colorado.

A map of a subdivision or land division showing lots, blocks, streets, and dedications, prepared for recording. In Colorado, plats must satisfy statutory content and approval requirements before recording.

The division of land into parcels for sale or development, regulated by state statute and local ordinances. Colorado's subdivision statutes set procedural and disclosure requirements for divided land.

The gift of land by an owner for public use, such as streets or parks, which must be accepted by the public authority. Dedications are commonly shown on recorded plats.

A nonpossessory right to use another's land for a specific purpose, such as utilities or access. Easements may be created by deed, prescription, implication, or necessity and are often shown on plats.

A Colorado document showing the location of improvements relative to boundaries, prepared by a licensed surveyor for title and lending purposes. It is not a boundary survey and carries statutory form requirements.

A person licensed by the Colorado State Board of Licensure for Architects, Professional Engineers, and Professional Land Surveyors to practice land surveying. Licensure requires education, experience, and examination.

The minimum technical and professional requirements adopted by rule for Colorado land surveyors, covering monumentation, accuracy, records, and plat content. Compliance is enforceable by the licensing board.

A Colorado registration allowing a business entity to offer surveying services under a licensed surveyor's responsible charge. It is distinct from an individual's professional license.

The direct control and supervision of surveying work by a licensed surveyor who takes professional responsibility for its accuracy and compliance. It is required for work offered to the public.

The professional practice of preserving or reestablishing boundary evidence, such as setting durable monuments and filing records, so future retracements can rely on physical proof. It is a core duty of the land surveyor.

A monument placed away from a corner and tied to it by bearing and distance, used to protect the corner's location if the corner monument is disturbed. It differs from a witness corner in purpose and placement.

A boundary formed by a water body, whose location may change with natural processes such as accretion or avulsion. Colorado law distinguishes gradual changes from sudden ones in determining ownership.

An east-west line run at intervals in the Public Land Survey System, typically every 24 miles, from which township lines are initiated. It differs from a correction line in its role in the survey scheme.

The starting point of a public land survey, where the principal meridian and base line intersect. Colorado's Sixth Principal Meridian initial point is in Kansas, north of the Colorado border.

A mathematically defined surface approximating the Earth's shape, used as the reference for geodetic coordinates. Modern horizontal datums specify the ellipsoid and its orientation.

A written instrument that appears to convey title but is legally defective, sometimes used to support adverse possession claims. It can affect the extent of land acquired under the doctrine.