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A line can be split at specified distances with a remainder length using the Generate Points Along Lines and Split Line at Point tools. Using these tools, the remaining distance is less than the specified distance.
Note: The Split Line at Point tool is only available in ArcGIS Desktop with an Advanced license.
The Generate Points Along Lines and Split Line at Point tools provide the same function as the Divide Line by Length Add-in, which can be downloaded from the ArcGIS website. Additionally, lines can be split proportionally based on specified distances using the Proportion command in the COGO toolbar, which requires a Standard or Advanced license. However, this option divides any difference between the line length and the sum of length specified proportionately among new line segments, and therefore there is no remainder segment.
Note: For the line to split at the points generated, ensure that the data is in a projected coordinate system.
This workflow describes how to split a line into segments of specified distance with a leftover distance using the Generate Points Along Lines and Split Line at Point tools.
Note: To determine the total length of the line to split, right-click the line feature class layer > Open Attribute Table.
Note: Search Radius is specified to split the line at all points which coincide with the line feature within the search radius. Otherwise, the line feature only splits at the first point.
The figure below is the output of a line split into eight parts, 25 kilometers each, and a leftover segment of roughly 13 kilometers. Another line feature class and layer is automatically created by ArcMap to represent the split lines, upon the completion of splitting.
Note: The number and length of each split part can be verified by viewing the SHAPE_Length column in the attribute table.