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HERE Optimized Map for Analytics (OMA) Data Specification

Optimized Map for Analytics Data Specification


Message Summary

message SpecialExplicationAttribute

Multi Segment attribute. Possible attribute orientation(s): Forward. Indicates a point where a road splits into two or more roads. If no route guidance advice was provided, the driver may not be able to determine in which direction to continue. Special Explication can be used for map display and route guidance.

Include: schema_navigation_special_explication.proto


Field Type Label Description
segment​_​identifier string  

An identifier for the referenced segment in the format of domain:system:type:id, for example, "here:cm:segment:532172642". This property is unique in a catalog.

segment​_​start​_​offset double  

Values range from [0.0 - 1.0]. Relative to the segment's orientation - not necessarily the overall chain orientation.

segment​_​end​_​offset double  

Values range from [0.0 - 1.0]. Relative to the segment's orientation - not necessarily the overall chain orientation.

segment​_​inverted bool  

The referenced segment is inverted in relation to the chain.

attribute​_​orientation string  

The attribute's orientation relative to the chain's first-to-last orientation.

multi​_​segment​_​id string  

Specifies how an attribute is assigned to a linear chain of one or more Segments.

A "linear chain" is a sequence of Segments that connect geometrically from start to end. Segments in a linear chain do not cross one over the other. A linear chain can form a loop in which case the first node of the start segment coincide with the last node of the end segment.

In general a multi-segment chain, has an overall first-to-last orientation that is independent of the the first-to-last orientation of each component Segment. Each component Segment in the chain will either have the same first-to-last orientation as the chain, or its orientation will be inverted relative to the chain.

It is critical to differentiate the orientation of each component segment from the overall orientation of the chain.

For example, it is possible that the first Node of a segment chain is the last Node of that chain's first segment. Likewise, the last Node of the chain can be the first Node of the chain's last segment.

The simple case consists of a single segment. In this case the chain and the segment have the same orientation.

In the multi-segment case, the chain orientation is independent of the individual segment orientations.

multi​_​segment​_​position int32  

Segment's position in the multi-segment chain.

partition​_​name string  

Quadkey (HERE tiling) for the current partition.