NE Land Surveyor key terms

A physical object placed or accepted to mark a boundary corner or survey point, such as an iron pin, concrete post, or marked tree. Its location and character carry legal weight in boundary disputes.

The practice of re-establishing or protecting an original survey corner so future surveyors can recover it. Includes setting new monuments, witness objects, and recording ties to nearby permanent features.

A monument placed near, but not at, a true corner, with a recorded bearing and distance to the actual corner. Used when the corner itself cannot be safely or practically monumented.

Physical or documentary indications of a boundary, including original monuments, fences, occupation lines, plat maps, deeds, and testimony. Surveyors weigh evidence quality before deciding a boundary position.

Testimony or statements outside the written deed offered to clarify a boundary's location. Courts may admit it to resolve ambiguities or explain monuments and calls, but not to contradict clear deed language.

The legal principle that when deed descriptions conflict, specific calls generally control over general ones, and natural monuments control over artificial monuments, courses, distances, and area.

A doctrine allowing a person who openly, continuously, exclusively, and hostilely occupies another's land for a statutory period to gain title. Surveyors must recognize boundary lines consistent with such occupation.

A right to use another's land acquired through open, notorious, continuous, and adverse use for a statutory period. Unlike adverse possession, it grants use rights rather than title.

A property boundary defined by a body of water, such as a river or stream. Location may follow the thread of the stream or the ordinary high water mark depending on state law and navigability.

A traverse line run along a water body to compute area and describe the upland boundary. It is generally not the legal boundary; the water itself usually defines the riparian limit.

The line on a shore reached by water under ordinary conditions, indicated by physical characteristics such as vegetation change or a distinct bank. Often used to define sovereign or riparian boundaries.

Surveying of water bodies to determine depths, bottom configuration, and shoreline features for navigation, dredging, or engineering. Data are reduced to a common vertical datum and charted.

Depth measurements taken during a hydrographic survey, typically corrected for tide, vessel draft, and instrument offset. Soundings are plotted to depict underwater topography.

A reference surface derived from tide observations, such as mean lower low water, used to reduce soundings and chart depths. It provides a consistent vertical base for hydrographic work.

A reference framework defining the size and shape of the Earth and the origin and orientation of coordinate systems. Examples include NAD83 and the modern National Spatial Reference System.

A reference surface for elevation measurements, such as the North American Vertical Datum of 1988. Heights are expressed relative to this surface, which is tied to tide gauge observations.

A mathematical method for representing the curved Earth on a flat surface. All projections distort distance, area, shape, or direction, so selection depends on the intended use.

A system of planar coordinate zones established for each state to support surveying and mapping. Each zone uses a defined projection and has a grid-to-ground scale factor.

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

A survey method that determines point positions by measuring angles and distances along connected lines. Closed traverses are adjusted to distribute misclosure before coordinates are computed.

The difference between a measured survey loop's computed end point and its known starting point. It indicates measurement error and must be adjusted or evaluated against allowable tolerances.

A statistical method that distributes measurement errors to produce the most probable coordinates and estimates of precision. It is widely used for control networks and traverse adjustments.

A set of stable, accurately positioned points used as a reference for surveys and construction layout. Horizontal and vertical control provide the framework from which project work proceeds.

The process of marking planned locations, grades, and alignments on the ground so construction can proceed. It relies on control points, design plans, and precise instrument work.

A survey documenting the actual location and elevation of constructed improvements compared with design plans. It supports payment, compliance review, and record drawings.

A circular or spiral alignment connecting two tangent roadway or railway segments. Its geometry is defined by radius, degree of curve, tangent length, and stationing.

A parabolic transition between two roadway grades that provides gradual change in slope. Design considers sight distance, comfort, drainage, and the algebraic difference in grades.

A linear referencing system along a route, usually expressed in hundreds of feet or meters from a starting point. Stations locate design features and construction limits along alignments.

A system for capturing, storing, analyzing, and displaying spatially referenced data. It combines map layers with attribute tables to support analysis and decision making.

A spatial data model representing the landscape as a grid of cells, each holding a value such as elevation or land cover. Raster data suit continuous surfaces and imagery analysis.

A spatial data model representing features as points, lines, and polygons with associated attributes. Vector data suit discrete objects such as parcels, roads, and utility lines.

The science of deriving measurements and spatial information from photographs or imagery. It supports topographic mapping, orthophoto production, and three-dimensional modeling.

An aerial image geometrically corrected so that scale is uniform and terrain displacement is removed. It functions as a map base with photographic detail.

A surveyed point with known coordinates used to georeference and check photogrammetric or remote sensing products. Its accuracy directly limits the accuracy of derived mapping.

A remote sensing method that measures distances by timing laser pulses reflected from surfaces. It produces dense point clouds used for terrain models, vegetation analysis, and corridor mapping.

A large set of three-dimensional points representing scanned surfaces, commonly produced by LiDAR or photogrammetry. Point clouds support modeling, measurement, and terrain extraction.

A raster representation of ground surface elevation, often derived from LiDAR or photogrammetry. It supports hydrologic analysis, grading design, and visibility studies.

An aircraft and its associated ground control, sensors, and communication links operated without an onboard pilot. Survey-grade UAS mapping requires ground control and careful flight planning.

A recorded map that divides land into lots, blocks, streets, and easements. Once approved and recorded, it becomes the legal description of the created parcels.

A legal right to use another person's land for a specific purpose, such as utilities or access. Easements are often shown on plats and must be located accurately in surveys.

Local regulation of land use, density, setbacks, and building height by designated districts. Surveyors and designers must check zoning before preparing site plans.