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SAE J2735-Draft-Rev26 [issued: 09-18-08]
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67 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
DF
DF
DF
DF
In addition, this item may be used by data structures in other ITS standards.
Remarks: When describing a path, the first node is the one closest to the intersection for the lane.
Typically, this is located on the stop line for approaches. Safety applications can use this to identify their
stop line without having to consult the Intersection Message. For egresses, the first node indicates where
the lane begins.
When the node list used to describe "non stopping areas" in a path (such as a stripped do not block area or a
railroad crossing) then the offsets are taken in paired sets. The first offset provides the start of the area to
be avoided, while the 2nd offset provides the end of that area. The path is presumed to follow the same
linear path described by the node list for the lane.
Subsequent nodes provide points further and further away along the lane's driven line. Include as many as
necessary to characterize lane curvature "within tolerance."
6.30 Data Frame: DF_Offsets
Use: The Offsets data structure provides one set of of signed offset values for determining the Xs and Ys
(and, possibly Zs when present) using the then current ReferencePoint and NodeConfih objects to build a
single point in a path for the enclosing ReferenceLane relating to a lane in the current intersection.
ASN.1 Representation:
Offsets ::= SEQUENCE {
xOffset INTEGER (-32767..32767),
yOffset INTEGER (-32767..32767),
zOffset INTEGER (-32767..32767) OPTIONAL,
width LaneWidth OPTIONAL
-- all in signed values where
-- the LSB is in units of 2.5 cm
}
XML Representation:
<xs:complexType name="Offsets" >
<xs:sequence>
<xs:element name="xOffset" >
<xs:simpleType>
<xs:restriction base="xs:short">
<xs:minInclusive value="-32767"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="yOffset" >
<xs:simpleType>
<xs:restriction base="xs:short">
<xs:minInclusive value="-32767"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
<xs:element name="zOffset" minOccurs="0">
<xs:simpleType>
<xs:restriction base="xs:short">
<xs:minInclusive value="-32767"/>
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