Simplifier Processor

Summary

The Simplifier Processor can be used to correct an event record’s associated geometry to render the geometry topologically consistent with its type. The Simplify Processor has no effect on point geometry. Multipoint geometries will snap all vertices to a grid appropriate for the geometry's spatial reference and then remove duplicate vertices. Polyline and polygon geometries with self-intersecting segments will be reconstructed with multiple paths or rings to produce a topologically correct multipart polyline or polygon.

Examples

• The Simplifier Processor can be used to correct the geometry from external data sources before attempting to send them to a feature service for display in a web map.
• Use the Simplifier Processor at the beginning of a GeoEvent Service as one method to ensure quality assurance/quality control in your geometric data.

Usage notes

• Simplification is not the same as generalization. Simplification does remove unnecessary vertices along an otherwise topologically correct line segment or reshapes a geometry to reduce detail to produce a geometry for more efficient display at small map scales. The purpose of simplification is to produce a feature that is valid for writing to a geodatabase.
• Provided a point, the processor will return the same point. The processor has no effect on point geometry.
• Provided a multipoint, the processor will snap all vertices to a grid appropriate for the geometry’s spatial reference and will then remove duplicate vertices.
• Provided a polyline or polygon, the processor will evaluate for self-intersecting segments. Geometries with self-intersecting segments will be reconstructed with multiple paths or rings to produce a topologically correct multipart polyline or polygon.
• Features created in an ArcGIS Desktop or ArcGIS Pro editing session are already topologically correct and simple.
• Features polled from a feature service do not require simplification before processing them in a GeoEvent Service.
• This processor can be configured to replace the event record's geometry with the simplified geometry or place the simplified geometry into a new geometry field using the Replace Geometry parameter. Adding a new field to a GeoEvent alters the event record's schema, which requires GeoEvent Server to create a new GeoEvent Definition. The new GeoEvent Definition will be managed by GeoEvent Server and deleted if changes are made to the processor or the GeoEvent Service in which the processor is used.

Parameters

Parameter	Description
Name	A descriptive name for the processor used for reference in GeoEvent Manager.
Processor	The name of the selected processor.
Geometry Field	The name of the geometry field or the GEOMETRY tagged field from the inbound event record. The processor evaluates and corrects the geometry from this field to render it topologically consistent with its type.
Replace Geometry	Specifies whether to replace the current geometry with the simplified geometry. The default is Yes. Yes - The event record geometry will be replaced with the simplified (corrected) geometry. No - The event record geometry will remain the same. The simplified geometry created by the processor will be stored in a new geometry field. Altering an event record’s schema by adding a new field requires a new GeoEvent Definition.
New Geometry Field Name (Conditional)	The name of the new geometry field where the simplified geometry will be stored. Property is shown when Replace Geometry is set to No and is hidden when set to Yes.
Tag the New Geometry Field as Geometry (Conditional)	Specifies whether the new geometry field created by the processor will be tagged as GEOMETRY. The GEOMETRY tag is used by GeoEvent Server to identify the event record’s realized geometry when multiple geometry fields are present. The default is No. Property is shown when ReplaceGeometry is set to No and is hidden when set to Yes.
New GeoEvent Definition Name (Conditional)	The name assigned to the new GeoEvent Definition. The new GeoEvent Definition will combine the schema of the inbound event record with the additional new geometry field. Property is shown when Replace Geometry is set to No and is hidden when set to Yes.

Considerations and limitations

• Consider replacing the existing event record geometry with the simplified (corrected) geometry prior to sending the event data to a feature service. Feature services only support one geometry type field and therefore whichever field has not been tagged as GEOMETRY will be converted and kept as a string. Additionally, the event record will have had its invalid geometry removed altogether.