NeighborPairFinder
Finds the closest two Candidate features within some maximum distance
of each Base feature and some minimum separation in heading between the
Candidates and the Base.
Parameters
Maximum Distance
Specify the maximum distance from each Base feature within which to find the closest two Candidate features. The maximum distance is measured in the units
of coordinates of the input features.
Minimum Separation Angle
Minimum separation angle is
measured in degrees, and specifies the minimum difference in heading from
the base that the two candidates must have before the second one will
be used.
Candidate Key Attribute
Used to select a Candidate
attribute from the two closest Candidates that will be preserved on the
Base feature as _key attributes.
Usage Notes
If no, or only one, Candidate feature is found to be within the maximum
distance, then the Base feature will be output unchanged via the UnmatchedBase
port.
If two Candidates are found, then the Base feature is output via the
Matched port. In
this case, the following attributes will be added to the Base feature:
- _distance1, _distance2
– The
distance (in ground units) from the Base to the matching Candidate
- _heading1, _heading2
– The
angle between the closest interpolated Base point and the closest interpolated
Candidate point.
- _closest_base_x1,
_closest_base_y1, _closest_base_x2, _closest_base_y2 –
The coordinates of the closest interpolated point on the Base feature
to the closest interpolated point on the Candidate feature.
- _closest_candidate_x1,
_closest_candidate_y1, _closest_candidate_x2, _closest_candidate_y2
– The
coordinates of the closest interpolated point on the Candidate feature
to the closest interpolated point on the Base feature.
- _candidate_angle1,
_candidate_angle2 –
The angle from the closest interpolated point on the Candidate feature
to the next vertex within the Candidate feature. (If
the closest interpolated point on the Candidate feature is its last vertex,
then candidate_angle will contain the angle from the previous vertex of
the candidate feature to the closest interpolated point on the Candidate
feature.)
- _candidate_label_angle1,
_candidate_label_angle2 –
The _candidate_angle adjusted so that if it is used as a text rotation,
the text will run from left to right. This
angle is guaranteed to be greater than or equal to 270 and less than 360,
or greater than or equal to 0 and less than or equal to 90.
(The attributes ending in 1 relate to the closest Candidate feature
found. The
attributes ending in 2 relate to the next closest Candidate feature found,
which has a sufficiently different heading.)
All headings are measured in degrees counterclockwise from horizontal.
All distances
are measured in the ground units of the features.
The ClosestVector and SecondClosestVector ports will have linear
features output on them that connect the closest points on the base and
candidate features. These
ports are useful only for visualizing where the closest points were found.
Invalid features (i.e. extra candidates) are output via the <Rejected> port. Base and candidate features with null geometries will be rejected.
Rejected features will have an fme_rejection_code attribute with one of the following values: EXTRA_CANDIDATE_FEATURE, INVALID_BASE_GEOMETRY_VERTICES, INVALID_CANDIDATE_GEOMETRY_VERTICES, INVALID_GEOMETRY_VERTICES.
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Transformer Categories
Spatial Analysis
Technical History
Associated FME function or factory: ProximityFactory, @Tcl2
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Tags Keywords: NeighbourPairFinder