Surveying Glossary — Letter E

E57 is an open-source, vendor-neutral file format standard designed for storing and exchanging 3D imaging data, point clouds, and metadata collected from surveying instruments and sensors.

E57 is an open-source 3D imaging data file format developed by ASTM International for storing point clouds, images, and metadata from surveying and scanning instruments.

A specialized surveying method that measures and quantifies the volume of soil, rock, and other materials moved or excavated during construction, mining, and land development projects.

An easement survey is a specialized land survey that establishes, documents, and maps the legal rights and physical boundaries of easements—the right to use another person's property for a specific purpose.

A surveying technology that uses electromagnetic waves or light to measure distances between survey points with high precision and efficiency.

EGNOS (European Geostationary Navigation Overlay Service) is a satellite-based augmentation system that enhances GPS accuracy for surveying and positioning applications across Europe.

Ellipsoidal height is the vertical distance measured from the reference ellipsoid surface to a point along the normal line, representing a fundamental component of three-dimensional positioning in surveying.

Emlid Flow App is a mobile surveying software platform that enables surveyors to perform high-accuracy GNSS positioning, data collection, and real-time corrections directly from smartphones or tablets.

An encroachment survey is a specialized property survey that identifies and documents unauthorized structures, improvements, or land use that extends beyond property boundaries or violates easement agreements.

EPSG codes are standardized numeric identifiers that define coordinate reference systems, map projections, and geodetic datums used globally in surveying, GIS, and geospatial applications.

Error propagation is the process by which measurement uncertainties combine and accumulate through mathematical operations and successive surveying observations, affecting the final accuracy of calculated results.

ETRS89 (European Terrestrial Reference System 1989) is a geodetic datum and coordinate system used across Europe for precise surveying, mapping, and positioning applications.