An editing procedure to ensure that all features that cross adjacent map sheets have the same edge locations.

Height above a fixed reference point, often the mean sea level. Elevation, or geometric height, is mainly used when referring to points on the Earth's surface.

Surface formed by the rotation of an ellipse about a main axis.
 

Distance of a point from the ellipsoid measured along the perpendicular from the ellipsoid to this point positive if upwards or outside of the ellipsoid.

Specifications for geospatial data that benefit the user community which have been approved by a regional entity such as MetroGIS. The endorsement of a regional dataset involves guidelines for access, content, and distribution in order to provide a consistent dataset across the region’s jurisdictions.

Something that has separate and distinct existence and objective or conceptual reality.

Process of determining the uncertainties of derived quantities from the known uncertainties of the quantities on which the derived quantity is dependent.