HERE Map Content Developer's Guide


Message Summary

message SlopeAttribute

Anchor type: Point. Possible SegmentAnchor Direction(s): Forward

Slope is the angle of inclination at the point indicating the angle of inclination from this point towards the segment. To represent a segment's slope exiting/entering an intersection, the point will be at 0.0 or 1.0 of the segment.

Slope indicates the angle of slope at a Shape Point as traversed from start node to the end node, or at a Node indicating the angle of slope from this Node toward the same segment, given in Decimal Degrees x 103.

Include: adas_attributes.proto


Field Type Label Description
segment​_​anchor​_​index uint32 repeated

Indices of all segment anchors to which this attribute applies. 0-based index references to segment_anchor in AdasPartition. Never empty.

slope sint32  

Slope value in decimal degrees, multiplied by 1000. Logical range -90 to +90 degrees, currently capped to -21 to +21 degrees. 21 degree slope is 38.38 percent gradient [tan(21 degrees)]. Hence the capping of slope values(At present, worlds steepest road is below 38 percent gradient).

accuracy Slope​Elevation​Accuracy  

Accuracy of the slope measurement.