An optional output of both the Resolve Road Conflicts and Merge Divided Roads tools is a displacement feature class. Displacement features store the amount and direction of change from the initial state of the data before these tools are run. Displacement information can then be applied to nearby features from different themes to ensure that spatial relationships are retained using this tool. For example, if roadways are separated by the Resolve Road Conflicts tool, it is often necessary to shift adjacent buildings along the roads accordingly.
The location of input features are adjusted based on the vector displacements contained in the displacement features. Adjustments are a compromise of all displacements, such that large displacements that occurred near an input feature will have more influence than smaller displacements further away. Conceptually, this action is similar to a rubber-sheeting process that moves features in various directions by various amounts to fit them back to the spatial relationship that they originally had with the roads.
This tool does not resolve graphic conflicts and in fact may introduce new conflicts. Topological errors that are introduced can be inspected using the Detect Graphic Conflict tool. If you are using this tool to propagate displacement to building features, consider running the Resolve Building Conflicts tool after propagation.
This tool operates by assessing graphic conflicts of symbolized features. The symbology extent and the reference scale are considered in conjunction with one another. Run this tool only after you have finalized the appearance of your symbols and ensure that the reference scale corresponds to the final intended output scale.
This tool operates on the displacement output generated by the Resolve Road Conflicts and Merge Divided Roads tools, which can be enabled to run by partitioning (using the Cartographic Partitions geoprocessing environment variable) when large datasets are processed. In this case, a single seamless displacement feature class will generated. Although this may be a very large feature class when generated with partitions, the information held within is not complex. This tool can manage the displacement polygons as inputs without using partitioning. See Generalizing large datasets using partitions for more information about processing large datasets.
PropagateDisplacement_cartography (in_features, displacement_features, adjustment_style)
The input feature layer containing features that may be in conflict. May be point, line, or polygon.
The displacement polygon features created by the Resolve Road Conflicts or the Merge Divided Roads tools which contain the degree and direction of road displacement that took place. These polygons dictate the amount of displacement that will be propagated to the input features.
Defines the type of adjustment that will be used when displacing input features.
PropagateDisplacement tool example 1 (Python window)
The following Python window script demonstrates how to use the PropagateDisplacement tool in immediate mode.
import arcpy from arcpy import env env.workspace = "C:/data" arcpy.PropagateDisplacement_cartography("footprints.lyr", "displacement.lyr", "AUTO")
PropagateDisplacement tool example 2 (stand-alone Python script)
This stand-alone script shows an example of using the PropagateDisplacement tool.
# Name: PropagateDisplacement_standalone_script.py # Description: Propagate the displacement of road features to nearby buildings # Author: ESRI # Import system modules import arcpy from arcpy import env # Set environment settings env.workspace = "C:/data" # Set local variables in_features = "footprints.lyr" displacement_features = "displacement.lyr" adjustment_style = "AUTO" # Execute Propagate Displacment arcpy.PropagateDisplacement_cartography(in_features, displacement_features, adjustment_style)
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