Annex A: Terms and definitions ofthe ISO 19100 standards
259
transfer protocol
common set of mIes for defining interactions between distributed systems (IS050
2002)
uncertainty
parameter, associated with the result of measurement, that characterizes the dispersion ofvalues that could reasonably be attributed to the measurand (IS048 2002)
NOTE
When the quality of accuracy or precision of measured values,
such as coordinates, is to be characterized quantitatively, the quality parameter is an
estimate of the uncertainty of the measurement results. Because accuracy is a
qualitative concept, one should not use it quantitatively, that is associate numbers
with it; numbers should be associated with measures ofuncertainty instead.
unit of measurement
defined quantity in which a dimensional parameter is expressed (IS048 2002)
NOTE
In Positioning Services, the usual units of measurement are either
angular units or linear units. Implementations of Positioning Services must clearly
distinguish between SI units and non-SI units. When non-SI units are employed,
their relation to SI units must be specified.
universal face
unbounded face in a 2-dimensional complex (IS039 2003)
NOTE
The universal face is normally not part of any feature, and is used
to represent the unbounded portion of the data set. Its interior boundary (it has no exterior boundary) would normally be considered the exterior boundary ofthe map represented by the data set. The ISO 19107 does not special case the universal face, but
application schemas may find it convenient to do so.
universal solid
unbounded topological solid in a 3-dimensional complex (IS039 2003)
NOTE
The universal solid is the 3-dimensional counterpart of the universal face, and is also normally not part of any feature.
universe of discourse
view of the real or hypothetical world that includes everything of interest (IS034
2002)
valid time
time when a fact is true in the abstracted reality (lS040 2002)
value domain
set ofaccepted values (lS035 2001, IS050 2002)
EXAMPLE
The range 3-28, all integers, any ASCII character, enumeration of
all accepted values (green, blue, white).
259
transfer protocol
common set of mIes for defining interactions between distributed systems (IS050
2002)
uncertainty
parameter, associated with the result of measurement, that characterizes the dispersion ofvalues that could reasonably be attributed to the measurand (IS048 2002)
NOTE
When the quality of accuracy or precision of measured values,
such as coordinates, is to be characterized quantitatively, the quality parameter is an
estimate of the uncertainty of the measurement results. Because accuracy is a
qualitative concept, one should not use it quantitatively, that is associate numbers
with it; numbers should be associated with measures ofuncertainty instead.
unit of measurement
defined quantity in which a dimensional parameter is expressed (IS048 2002)
NOTE
In Positioning Services, the usual units of measurement are either
angular units or linear units. Implementations of Positioning Services must clearly
distinguish between SI units and non-SI units. When non-SI units are employed,
their relation to SI units must be specified.
universal face
unbounded face in a 2-dimensional complex (IS039 2003)
NOTE
The universal face is normally not part of any feature, and is used
to represent the unbounded portion of the data set. Its interior boundary (it has no exterior boundary) would normally be considered the exterior boundary ofthe map represented by the data set. The ISO 19107 does not special case the universal face, but
application schemas may find it convenient to do so.
universal solid
unbounded topological solid in a 3-dimensional complex (IS039 2003)
NOTE
The universal solid is the 3-dimensional counterpart of the universal face, and is also normally not part of any feature.
universe of discourse
view of the real or hypothetical world that includes everything of interest (IS034
2002)
valid time
time when a fact is true in the abstracted reality (lS040 2002)
value domain
set ofaccepted values (lS035 2001, IS050 2002)
EXAMPLE
The range 3-28, all integers, any ASCII character, enumeration of
all accepted values (green, blue, white).