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HERE Optimized Map for Analytics (OMA) Data Specification

Optimized Map for Analytics Data Specification

Curvature​Heading​Attribute

Message Summary

message CurvatureHeadingAttribute

Point/Multi attribute. Possible attribute orientation(s): Forward. For values within a segment, applied as a point anchor. At intersections, applied as a two-segment anchor representing entrance and exit segments.

Include: schema_adas_curvature_heading.proto

Properties

Field Type Label Description
curvature sint32  

Curvature value in inverse of radius in meters multiplied by 1,000,000. Curvature is an approximation of the road geometry by means of circles at road geometry points and is published with respect to one travel direction. It may be used to warn driver of upcoming curve, adjust headlight aiming, assist with electronic stability control.

heading sint32  

Heading value in decimal degrees, multiplied by 1000. Relative to true north 0 - 359,999.

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.