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SAE J2735-Draft-Rev18 [issued: 06-26-07]
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52 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
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. 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." Note that the setting of the NodeConfih determine the value
of the LSB of the offsets and how they are applied. Nominally, this is set to be 1 cm (still TBD).
6.21 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
}
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"/>
</xs:restriction>
</xs:simpleType>
</xs:element>
</xs:sequence>
</xs:complexType>
Used by: This entry is used directly by one other data structure in this standard, a DF called DF_NodeList
6.22 Data Frame: DF_Position2D
Use: A collection of the two 4 byte lat-long information elements used to build a complete 2D position set.
No elevation data is sent in this 8 bytes data frame.
ASN.1 Representation:
Position2D ::= SEQUENCE {
lat Latitude, -- in 1/8th micro degrees
long Longitude -- in 1/8th micro degrees
}
XML Representation:
<xs:complexType name="Position2D" >
<xs:sequence>
<xs:element name="lat" type="Latitude" />