The Distance Markers (DistanceMarkers File Geodatabase Feature Class) point layer contains distance markers within Asia Pacific. DistanceMarkers is data which models distance markers, like mile-markers or hectometer markers, along the motorway. Distance Markers are sequentially numbered markers placed along roads at regular intervals that serve as a reference location on a motorway.
This layer contains the following fields:
Field Name | Description | Values |
---|---|---|
OBJECTID | Internal feature number | Sequential unique whole numbers that are automatically generated. |
Shape | Feature geometry | Coordinates defining the features. |
FEATURE_POINT_ID | Feature Point identifier | A unique ID for a Distance Marker. Feature Point ID can be used to retrieve the road name relative to the Distance Marker for destination selection and map display. |
STREET_ADDRESS_ID | Street Address identifier | The addressed Link on which the Distance Marker is located. |
DISTANCE_VALUE | Distance Marker Value | The actual distance marker value representing the distance along the road. Distance Marker Value can be used for destination selection and location referencing. Distance Marker Value does not publish decimal values (for example, Distance Value = "11,00" is published as "11"). Distance Marker Value may contain alphanumeric text when alphanumeric text is displayed on the Distance Marker shield (for example, a mile marker may display a distance as "109A"). |
DIRECTION_ON_SIGN | Direction On Sign | Direction on Sign indicates the official directional identifiers assigned to the Distance Marker: E (East), N (North), W (West), S (South). Direction on Sign can be used for destination selection based on Distance Marker. Direction on Sign is only published on bi-directional roads when the distance marker shield indicates the route direction. Direction on Sign is published on single directional roads when present on the sign. Direction on Sign does not have a language code associated. English (ENG) route directions are published in Direction on Sign. Route directions for other languages are published in Direction on Sign metadata. |
DIRECTION | Direction | Identifies the applicable link direction of travel for the Distance Marker: F (From Reference Node), T (Toward Reference Node), B (Both Directions). Direction can be used for routing and guidance to determine the applicable direction of travel for the distance marker. Direction is established using the Reference and Non-Reference node. The Reference node is located at the "beginning" of a link. The Non-Reference node is located at the "end" of a link. |
UNIT_OF_MEASURE | Unit of Measure | Identifies the unit of measure mostly used in that country to describe road and traffic conditions: M (Metric–kilometres and metres), E (English–miles and feet). This attribute can be used to determine the distance marker unit of measure. Unit of Measure is published when the unit of measure on the distance markers shield is different than the country’s default Unit of Measure. |
ENHANCED | Enhanced | Indicates whether a distance marker meets the positional accuracy requirements: Y (Distance marker meets positional accuracy of 15 metres) or N (Distance marker might not meet positional accuracy of 15 metres). The Enhanced attribute can be used to differentiate between interpolated and noninterpolated distance markers in order to determine the reliability of the distance marker location. Distance Marker may not be placed with Enhanced accuracy when no posted sign was found in reality; hence distance marker location on the link is generated by interpolation with closest enhanced distance markers. Example: Mile marker 12Mi is not found posted along the road; Mile Marker 12Mi is calculated based on the position of the closest Enhanced mile marker (11 or 13, for example). |