Absolute Accuracy -- A measure of the location of features on a map compared to their true position on the face of the earth.

Address Actual or Real -- The simple, everyday element that designates a specific, situs location, such as a house number or an office suite.

Address matching -- See Geocoding.

Address Range -- set(s) of numbers usually comprised of four (4) distinct values that represent a theoretical situs address at either end of a centerline segment. Two numbers of the range represent the lowest addresses, while the other two represent the highest. The numbers are further distinguished as being on either the left or the right side of the segment. In topological terms, the low numbers are associated with the FROM node of the segment, while the high numbers are associated with the TO node. Likewise, left and right are determined by the direction of the segment, as defined by the FROM and TO nodes.

At-Grade Access Ramp -- Connects roadways, permitting traffic flow from one uncontrolled access route to another without crossing another traffic stream.

Example:

Attribute(s) -- Properties and characteristics of spatial data entities.

Arc/Node Mode -- Arcs and nodes are defined by the user as they are digitized.

Character -- (Also known as text or alpha)

Centerline- (See road)

Connector segments -- Minor road segments that permit traffic flow from one route to another without crossing any other traffic. These segments can be signed for official use only for government, law enforcement or emergency use only.

Example:

Dual carriageway routes -- A physically divided roadway that necessitates two or more sets of line work to adequately represent the roadway geometry. According to the Federal Highway Administration (FHWA), divided facilities should be represented as dual carriageway if:

Example:

Entity -- Any object about which an organization chooses to collect data.

Frontage Road -- Roadways that are often adjacent to interstate level highways and some single-carriageway highways.

Example:

Geocodable -- An attribute database that is capable of being manipulated by GIS software to determine a theoretical address and its coordinates.

Geocoding -- Mechanism for building a database relationship between addresses and geospatial features. When an address is matched to the geospatial features, geographic coordinates are assigned to the address.

Grade Separated Access Ramp -- Connects roadways, permitting traffic flow from one mainline route to another without crossing any other traffic stream. These are typically found at controlled access interchanges, e.g. access ramps on an interstate highway. The grade separation implied by the name refers to the different levels at which the two mainline routes cross each other, i.e. at an overpass or underpass.

Example:

Highway Facility -- Generally, these are public service facilities located along freeways and highways. Often similar in design, these may include weigh stations, welcome centers, overlooks, truck parking areas, and rest areas.

Example: Rest Area

Example: Weight Station

Example: Welcome Center

Increment Mode -- Points are collected every n millimeters from the previous point.

NA- Not Applicable.

Point Mode -- Single points are recorded one at a time.

Range -- Numbers associated with segments of a digital centerline file that represent the actual high and low addresses at either end of each segment.

Relative Accuracy -- A measure of the accuracy of individual features on a map when compared to other features on the same map.

Road (centerline)- Centerline shall include all clearly defined passages through which a standard vehicle may travel as well as driveways extending more than 500 feet and/or driveways containing two or more addressed structures.

Single carriageway routes -- A roadway with one, two or more lanes arranged within a single course with no central reservation or median to separate opposing flows of traffic.

Example:

Situs -- The proper or original position of a specific location. An element that designates a fixed site, such as the address of a property or building.

Stream Mode -- Points are collected on regular intervals or time or distance.

Spaghetti Mode -- Points are collected every n milliseconds.

Theoretical -- A location that can be interpolated along a centerline file through geocoding software.

Topology -- Spatial relationships and connectivity among graphic GIS features, such as points, lines, and polygons. These relationships allow display and analysis of “intelligent” data in GIS. Many topological structures incorporate begin and end relationships, direction and right / left identification.

Traffic circles -- The intersection of two or more roadways in an uncontrolled at-grade interchange, intended to keep traffic moving through the intersection.

Example:

Vanity -- A special address that is inconsistent with or an exception to the standard addressing schema.