Summary
Merges lines that have coincident endpoints and, optionally, common attribute values.
Illustration
Usage
The attributes of the features which become aggregated by this tool can be summarized or described using a variety of statistic types. The statistic type used to summarize attributes is added to the output feature class as a single field with the following naming standard of statistic type + underscore + input field name. For example, if the input has a field named POP that is summarized, using the SUM statistics type will result in a field named SUM_POP in the output feature class.
The availability of physical memory may limit the amount (and complexity) of input features that can be processed and unsplit into a single output line feature. This limitation could cause an error to occur, as the unsplit process may require more memory than is available. To prevent this, Unsplit Line may divide and process the input features using an adaptive tiling algorithm. To determine the features that have been tiled, run the Frequency tool on the result of this tool, specifying the same fields used in the Dissolve Field(s) parameter for the Frequency Field(s) parameter. Any record with a frequency value of 2 has been tiled. Tile boundaries are preserved in the output features to prevent the creation of features that are too large to be used by ArcGIS.
Null values are excluded from all statistical calculations. For example, the AVERAGE of 10, 5, and NULL is 7.5 ((10+5)/2). The COUNT tool returns the number of values included in the statistical calculation, which in this case is 2.
The Dissolve Field(s) parameter's Add Field button is used only in ModelBuilder. In ModelBuilder, where the preceding tool has not been run, or its derived data does not exist, the Dissolve Field(s) parameter may not be populated with field names. The Add Field button allows you to add expected fields so you can complete the tool's dialog box and continue to build your model.
Syntax
UnsplitLine_management (in_features, out_feature_class, {dissolve_field}, {statistics_fields})
Parameter | Explanation | Data Type |
in_features | The line features to be aggregrated. | Feature Layer |
out_feature_class | The feature class to be created that will contain the aggregated features. | Feature Class |
dissolve_field [dissolve_field,...] (Optional) | The field or fields on which to aggregate features. The Add Field button, which is used only in ModelBuilder, allows you to add expected fields so you can complete the dialog box and continue to build your model. | Field |
statistics_fields [[field, {statistic_type}],...] (Optional) | The fields and statistics with which to summarize attributes. Text attribute fields may be summarized using the statistics FIRST or LAST. Numeric attribute fields may be summarized using any statistic. Nulls are excluded from all statistical calculations.
| Value Table |
Code sample
UnsplitLine example (Python window)
The following Python window script demonstrates how to use the UnsplitLine tool in immediate mode.
import arcpy
arcpy.env.workspace = "C:/data/Portland.gdb/Streets"
arcpy.UnsplitLine_management("streets", "C:/output/output.gdb/streets_unsplit",
["STREETNAME", "PREFIX"])
UnsplitLine example 2 (stand-alone script)
The following stand-alone script demonstrates how to use the UnsplitLine tool.
# Name: UnsplitLine_Example2.py
# Description: Unsplit line features based on common attributes
# Import system modules
import arcpy
# Set environment settings
arcpy.env.workspace = "C:/data/Portland.gdb/Streets"
# Set local variables
inFeatures = "streets"
outFeatureClass = "C:/output/output.gdb/streets_unsplit"
dissolveFields = ["STREETNAME", "PREFIX"]
# Execute UnsplitLine using STREETNAME and PREFIX as Dissolve Fields
arcpy.UnsplitLine_management(inFeatures, outFeatureClass, dissolveFields)
Environments
- Current Workspace
- Scratch Workspace
- Output Coordinate System
- Geographic Transformations
- Extent
- XY Resolution
- XY Tolerance
- Output has M values
- M Resolution
- M Tolerance
- Output has Z values
- Default Output Z Value
- Z Resolution
- Z Tolerance
- Qualified Field Names
- Output CONFIG Keyword
- Auto Commit
- Output Spatial Grid 1
- Output Spatial Grid 2
- Output Spatial Grid 3
- Output XY Domain
- Output M Domain
- Output Z Domain
Licensing information
- ArcGIS Desktop Basic: No
- ArcGIS Desktop Standard: No
- ArcGIS Desktop Advanced: Yes