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The below picture shows the table of a shapefile, including fields of TotalCT, and coordinates of the ends of the line. I want to merge the lines if they are adjacent and only keep the field of TotalCT.

I have no idea about the logical flow of this arcpy code.

Any suggestions?

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You should be able to use the Dissolve tool (no need for ArcPy) which:

Aggregates features based on specified attributes.

In your case just use a single attribute (TotalCT).

It looks like this will result in a multipart feature so, if you need to get the parts that do not touch as separate features, try running Multipart to Singlepart as a second step:

Creates a feature class containing singlepart features generated by separating multipart input features.

Alternatively, a one step process that could do this is described in a comment by @MichaelMiles-Stimson (but he has made a later comment questioning the accuracy of that alternative):

Dissolve has a switch for 'Multipart' and 'Unsplit Lines' http://help.arcgis.com/EN/arcgisdesktop/10.0/help/index.html#//00170000005n000000 if you select 'no multipart' and 'unsplit lines' it should leave the unattached lines exactly as they are, only merging/dissolving lines that share a common endpoint - no need to run multipart to single.

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  • I am sorry I didn't give the question clearly. In the table, not all lines are adjacent. Therefore, I have to check whether lines are adjacent and only merge those adjacent lines.
    – Tianxin Li
    Commented Sep 2, 2016 at 1:38
  • Also, the Dissolve gives me another idea that is can I dissolve all the line first, and then split the dissolved line to separate lines if they are not touching.
    – Tianxin Li
    Commented Sep 2, 2016 at 1:40
  • Really neat method! Works for my case.
    – Tianxin Li
    Commented Sep 2, 2016 at 1:59
  • 1
    Dissolve has a switch for 'Multipart' and 'Unsplit Lines' help.arcgis.com/EN/arcgisdesktop/10.0/help/index.html#//… if you select 'no multipart' and 'unsplit lines' it should leave the unattached lines exactly as they are, only merging/dissolving lines that share a common endpoint - no need to run multipart to single.
    – Michael Stimson
    Commented Sep 2, 2016 at 2:51
  • @MichaelMiles-Stimson I forgot about that but have now incorporated it into my answer. Always feel free to add another answer or to edit mine when you see something like this.
    – PolyGeo ♦
    Commented Sep 2, 2016 at 3:07

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