| Label | Explanation | Data Type |
Input Features | The line features to be aggregated. | Feature Layer |
Output Feature Class | The feature class to be created that will contain the aggregated features. | Feature Class |
Dissolve Fields (Optional) | The field or fields on which features will be aggregated. If no fields are specified, the tool will dissolve all features together. | Field |
Statistics Fields (Optional) | Specifies the field or fields containing the attribute values that will be used to calculate the specified statistic. Multiple statistic and field combinations can be specified. Null values are excluded from all calculations. By default, the tool will not calculate any statistics. Numeric attribute fields can be summarized using any statistic. Text attribute fields can be summarized using minimum, maximum, count, first, last, unique, concatenate, and mode statistics.
| Value Table |
Concatenation Separator
(Optional) | A character or characters that will be used to concatenate values when the Concatenation option is used for the Statistics Fields parameter. By default, the tool will concatenate values without a separator. | String |
Summary
Aggregates line features that have coincident endpoints and, optionally, common attribute values.
Illustration
Usage
The attributes of the features that are aggregated by this tool can be summarized or described using a variety of statistics. The statistic used to summarize attributes is added to the output feature class as a single field with the naming standard of statistic type + underscore + input field name. For example, if the SUM statistic type is used on a field named POP, the output will include a field named SUM_POP.
The availability of physical memory may limit the amount (and complexity) of input features that can be processed and aggregated into a single output line feature. This limitation may 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.
Caution:
Running Unsplit Line on the output of a previous unsplit process will rarely reduce the number of features in the output when the original processing divided and processed the inputs using adaptive tiling. The maximum size of any output feature is determined by the amount of available memory at run time; output containing tiles is an indicator that aggregating further with the available resources will cause an out-of-memory situation or result in a feature that is unusable. Additionally, running the Unsplit Line tool a second time on output that was created this way may result in slow performance for little to no gain and may cause an unexpected failure.
Null values are excluded from all statistical calculations. For example, the average of 10, 5, and a null is 7.5 ((10 + 5) / 2). The count returns the number of values included in the statistical calculation, which in this case is 2.
Parameters
arcpy.management.UnsplitLine(in_features, out_feature_class, {dissolve_field}, {statistics_fields}, {concatenation_separator})| Name | Explanation | Data Type |
in_features | The line features to be aggregated. | 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 features will be aggregated. If no fields are specified, the tool will dissolve all features together. | Field |
statistics_fields [[field, {statistic_type}],...] (Optional) | Specifies the field or fields containing the attribute values that will be used to calculate the specified statistic. Multiple statistic and field combinations can be specified. Null values are excluded from all calculations. By default, the tool will not calculate any statistics. Numeric attribute fields can be summarized using any statistic. Text attribute fields can be summarized using minimum, maximum, count, first, last, unique, concatenate, and mode statistics.
| Value Table |
concatenation_separator (Optional) | A character or characters that will be used to concatenate values when the CONCATENATION option is used for the statistics_fields parameter. By default, the tool will concatenate values without a separator. | String |
Code sample
The following Python window script demonstrates how to use the UnsplitLine function in immediate mode.
import arcpy
arcpy.env.workspace = "C:/data/Portland.gdb/Streets"
arcpy.management.UnsplitLine("streets", "C:/output/output.gdb/streets_unsplit",
["STREETNAME", "PREFIX"])The following stand-alone script demonstrates how to use the UnsplitLine function.
# 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"]
# Run UnsplitLine using STREETNAME and PREFIX as Dissolve Fields
arcpy.management.UnsplitLine(inFeatures, outFeatureClass, dissolveFields)