 |
 |
 |
 |
|
 |
 |
SAE J2735-Draft-Rev26 [issued: 09-18-08]
-
95 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
Used By: This entry is used directly by one other data structure in this standard, a MSG called
MSG_RoadSideAlert <ASN> <XML>. In addition, this item may be used by data structures in other
ITS standards.
Remarks: Some message sets allow a request of other relevant messages by use of this ID, some others do
not. Some messages do not yet support this ID and force the message receiver to sort the recovered
message to align event geographically. This is expected to be an area of harmonization. Developers should
also note that data from different source agencies can vary with the numbering used as well.
7.3 Data Element: DE_MAYDAY_Location_quality_code
Use: A value representing the "goodness" of the position estimate (accuracy). The element is used to
convey the relative quality of a GPS generated location. This quality value is enumerated as shown, as
follows below.
ASN.1 Representation:
Location-quality ::= ENUMERATED {
loc-qual-bt1m (0), -- quality better than 1 meter
loc-qual-bt5m (1), -- quality better than 5 meters
loc-qual-bt12m (2), -- quality better than 12.5 meters
loc-qual-bt50m (3), -- quality better than 50 meters
loc-qual-bt125m (4), -- quality better than 125 meters
loc-qual-bt500m (5), -- quality better than 500 meters
loc-qual-bt1250m (6), -- quality better than 1250 meters
loc-qual-unknown (7) -- quality value unknown
} -- 3 bits, appends with loc-tech to make one octet (0..7)
XML Representation:
<xs:annotation>
<xs:appinfo>
loc qual bt1m (0) -- quality better than 1 meter
loc qual bt5m (1) -- quality better than 5 meters
loc qual bt12m (2) -- quality better than 12.5 meters
loc qual bt50m (3) -- quality better than 50 meters
loc qual bt125m (4) -- quality better than 125 meters
loc qual bt500m (5) -- quality better than 500 meters
loc qual bt1250m (6) -- quality better than 1250 meters
loc qual unknown (7) -- quality value unknown
</xs:appinfo>
<xs:documentation>
3 bits, appends with loc-tech to make one octet (0..7)
</xs:documentation>
</xs:annotation>
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:unsignedInt">
<xs:minInclusive value="0"/>
<xs:maxInclusive value="7"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="loc qual bt1m"/>
<xs:enumeration value="loc qual bt5m"/>
<xs:enumeration value="loc qual bt12m"/>
<xs:enumeration value="loc qual bt50m"/>
<xs:enumeration value="loc qual bt125m"/>
<xs:enumeration value="loc qual bt500m"/>
<xs:enumeration value="loc qual bt1250m"/>
<xs:enumeration value="loc qual unknown"/>
</xs:restriction>
</xs:simpleType >
</xs:union>
</xs:simpleType>
 |