Performs a point-on-line overlay. Each input line is split at its closest place to any point within the specified point tolerance, and attributes may be shared between related points and lines (spatial join).

Jump to Configuration

Typical Uses

  • Splitting lines where they overlay points
  • Identifying lines that intersect with a point
  • Identifying points that fall on a line

How does it work?

The PointOnLineOverlayer compares points and lines, splitting the lines where a point falls on (or within a specified distance of) the lines. Each resulting new line may receive the attributes of the points that matched the original line, and points may receive attributes from the lines (a spatial join). Features (points and lines) also receive a count of the number of matches encountered.

Aggregates can either be deaggregated before processing or rejected. Intersections between linear features are not computed.


Usage Notes

  • Where point geometries are expected, Point Cloud geometries are not supported.
  • Chopped Lines output via the Line output port receive the attributes of all points that matched the original input line (if a list is enabled). All points that the original line encountered are included - not only the endpoints of the new line segment.
    To obtain attributes from points matching only the ends of the new line features, use a second transformer (consider another PointOnLineOverlayer, or a NeighborFinder).

Z Values and Measures

If the input Line features have measures and/or 3D coordinates, measures and elevations (z values) are interpolated and assigned to points according to the selections made in the Attribute Accumulation parameters.

If Attribute Accumulation Mode is set to Drop Incoming Attributes, the measures and z values will be ignored. If it is set to Merge, Prefix, or Replace with Single Incoming, the appropriate values will be calculated and assigned to the points. If a z value is added to a 2D point, it will become 3D.

Choosing a Spatial Transformer

Many transformers can assess spatial relationships and perform spatial joins - analyzing topology, merging attributes, and sometimes modifying geometry. Generally, choosing the one that is most specific to the task you need to accomplish will provide the optimal performance results. If there is more than one way to do it (which is frequently the case), time spent on performance testing alternate methods may be worthwhile.

To correctly analyze spatial relationships, all features should be in the same coordinate system. The Reprojector may be useful for reprojecting features within the workspace.


Input Ports

Output Ports


Editing Transformer Parameters

Using a set of menu options, transformer parameters can be assigned by referencing other elements in the workspace. More advanced functions, such as an advanced editor and an arithmetic editor, are also available in some transformers. To access a menu of these options, click beside the applicable parameter. For more information, see Transformer Parameter Menu Options.

Defining Values

There are several ways to define a value for use in a Transformer. The simplest is to simply type in a value or string, which can include functions of various types such as attribute references, math and string functions, and workspace parameters. There are a number of tools and shortcuts that can assist in constructing values, generally available from the drop-down context menu adjacent to the value field.

Dialog Options - Tables

Transformers with table-style parameters have additional tools for populating and manipulating values.


Processing Behavior


Feature Holding



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Examples may contain information licensed under the Open Government Licence – Vancouver and/or the Open Government Licence – Canada.