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SAE J2735-Draft-Rev29 [issued: 12-11-08]
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144 -
This is an SAE Motor Vehicle Council draft document of the DSRC committee, subject to change.
DF
<XML>, and
MSG
In addition, this item may be used by data structures in other ITS standards.
7.80 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>
In addition, this item may be used by data structures in other ITS standards.
Remarks: This element was originally defined in J2313. From Section 8.35 "Location-Quality." This
element is used by the IEEE IM effort relating to the accuracy of location information.