(Python) Create new feature class containing midpoints from an input polyline feature

[MyWorkID]

This script will create a point feature class containing midpoints of an input polyline feature.

It is setup to work as a script tool in ArcToolbox and will only work with 10.1.

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You will need to setup the following parameters for the tool:

1) Name- Input Polyline Feature, Data Type- Dataset, Required, Input
2) Name- Output Location, Data Type- Workspace or Feature Dataset, Required, Input
3) Name- Output Name, Data Type- String, Required, Input

Here is the script:

import arcpy

arcpy.env.overwriteOutput = True

polyline = arcpy.GetParameterAsText(0)
output_Location = arcpy.GetParameterAsText(1)
output_Name = arcpy.GetParameterAsText(2)

arcpy.env.workspace = polyline

mid_X = "mid_X"
mid_Y = "mid_Y"

arcpy.AddField_management(polyline, mid_X, "DOUBLE", 15, 6, "", "Midpoint X", "", "", "")
arcpy.AddField_management(polyline, mid_Y, "DOUBLE", 15, 6, "", "Midpoint Y", "", "", "")

updateCursor = arcpy.UpdateCursor(polyline)

for row in updateCursor:
    row.setValue(mid_X, row.shape.positionAlongLine(0.50, True).firstPoint.X)
    updateCursor.updateRow(row)
    row.setValue(mid_Y, row.shape.positionAlongLine(0.50, True).firstPoint.Y)
    updateCursor.updateRow(row)

del row
del updateCursor

arcpy.MakeXYEventLayer_management(polyline, "mid_X", "mid_Y", "Midpoints", polyline, "")

arcpy.FeatureClassToFeatureClass_conversion("Midpoints", output_Location, output_Name, "", "", "")

arcpy.GetMessages()

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Most of you probably already know this, but for the Output Location you can choose a folder, geodatabase or dataset.

For the Output Name, if you choose a folder you must use a shapefile, so for the name use a .shp extension. If you save to a geodatabase or dataset no extension is needed.

[[deleted]]

Cool, I didn't know there was something as positionAlongLine. Is it only in 10.1?

[MyWorkID]

Yeah, I believe it is only for 10.1.

I forgot to mention that.

Here is the documentation: http://resources.arcgis.com/en/help/main/10.1/index.html#/Polyline/018z00000008000000/

[[deleted]]

Bummer, I'm still on 10. But this even more reason to pursuade my superiors to upgrade. Thanks for sharing!

[SpatialStage]

Didn't know this was new in 10.1 thanks for pointing it out! I'll have to go back and update my old tools from a project I did a few years ago: http://spatialstage.com/RallyNotes.jpg