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Delete all non-end point vertices in a line

RobBlash

I'm looking for a simple way to delete all of the "interior" (non endpoint) vertices in a line. It can't be a GP tool that writes a new output, I need to modify the existing features. Generalize wont work because the data is in a geometric network that I cannot delete and recreate. Ideally I could select multiple lines and have them processed with a single button click. Is there anything out there that will do this?

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RebeccaStrauch__GISP

You do realize that is you delete all the vertices that you will have a straight line between the two end points, correct?

If you are editing Deleting a vertex—Help | ArcGIS for Desktop but since you are using a network, maybe this will help

Configuring the Network Dataset builder—Help | ArcGIS for Desktop

I do not use networks myself, but that looks like it will help remove some vertices without compromising the network itself. there are also several other links available from that landing page that might be of help.

RobBlash

Yup a straight line is exactly what I want. This is for a water utility when a bunch of service connections are snapped to a line. If you move the line endpoints you wind up with a funky looking water line, unless you manually adjust all of the vertices where the services are snapped to the line. If you delete all of the middle vertices the geometric network retains the service snapping while giving you a nice straight line. I just need to figure out hot to do it efficiently. Delete vertices takes too long when there are thousands of features.

AnneKathrineWenaasRibe_1-1651739575888.png

RobBlash

Hopefully this clears it up more

RebeccaStrauch__GISP

You can get to the geometry and grab the first and last points using python

Geometry—Help | ArcGIS for Desktop

but again, since I do not work with networks, I'm not sure how this would effect your original data (so always test on a copy).

How Simplify Line works—Help | ArcGIS for Desktop might be another option.

RobBlash

As an update for anyone interested, I found that the ET GeoTools generalize will work on a line in a geometric network. While it still requires processing individual lines one at a time it is a better solution than manually deleting vertices.

JoshuaBixby

I am not sure if this will work when the layer is part of a network, but below is an example of how a MULTILINESTRING can be collapsed to just the endpoints of the individual LINESTRINGS. The code will work against a single-part MULTILINESTRING too.

<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> polyline <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>FromWKT<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'MULTILINESTRING((0 0, 5 0, 7 0, 7 1, 9 1, 9 3, 9 5),(3 2, 5 2, 6 2, 8 5))'</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> polyline<SPAN class="punctuation token">.</SPAN>WKT
u<SPAN class="string token">'MULTILINESTRING ((0 0, 5 0, 7 0, 7 1, 9 1, 9 3, 9 5), (3 2, 5 2, 6 2, 8 5))'</SPAN>
<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> arr <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Array<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> <SPAN class="keyword token">for</SPAN> line <SPAN class="keyword token">in</SPAN> polyline<SPAN class="punctuation token">.</SPAN>getPart<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">:</SPAN>
<SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; arr<SPAN class="punctuation token">.</SPAN>add<SPAN class="punctuation token">(</SPAN>arcpy<SPAN class="punctuation token">.</SPAN>Array<SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">[</SPAN>line<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">,</SPAN> line<SPAN class="punctuation token">[</SPAN><SPAN class="operator token">-</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN>&nbsp;&nbsp;&nbsp;&nbsp; 
<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> polyline <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Polyline<SPAN class="punctuation token">(</SPAN>arr<SPAN class="punctuation token">)</SPAN>
<SPAN class="operator token">>></SPAN><SPAN class="operator token">></SPAN> polyline<SPAN class="punctuation token">.</SPAN>WKT
u<SPAN class="string token">'MULTILINESTRING ((0 0, 9 5), (3 2, 8 5))'</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

The following code could be wrapped in an ArcPy Data Access cursor.

MatthewComartin

The following Python code would accomplish what you're after:

<SPAN class="keyword token">import</SPAN> arcpy

fc <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>mapping<SPAN class="punctuation token">.</SPAN>Layer<SPAN class="punctuation token">(</SPAN><SPAN class="string token">'C:/Temp/Temp.gdb/myFc'</SPAN><SPAN class="punctuation token">)</SPAN>

<SPAN class="keyword token">with</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>da<SPAN class="punctuation token">.</SPAN>UpdateCursor<SPAN class="punctuation token">(</SPAN>fc<SPAN class="punctuation token">,</SPAN><SPAN class="punctuation token">[</SPAN><SPAN class="string token">"SHAPE@"</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="keyword token">as</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> row <SPAN class="keyword token">in</SPAN> cursor<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token">#loop through parts</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> part <SPAN class="keyword token">in</SPAN> row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; count <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="comment token"># loop through verticies</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">for</SPAN> pnt <SPAN class="keyword token">in</SPAN> part<SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; count <SPAN class="operator token">=</SPAN> count <SPAN class="operator token">+</SPAN> <SPAN class="number token">1</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <SPAN class="keyword token">if</SPAN> count <SPAN class="operator token">>=</SPAN> <SPAN class="number token">3</SPAN><SPAN class="punctuation token">:</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; arr <SPAN class="operator token">=</SPAN> row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">.</SPAN>getPart<SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; arr<SPAN class="punctuation token">.</SPAN>remove<SPAN class="punctuation token">(</SPAN><SPAN class="number token">1</SPAN><SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; newLine <SPAN class="operator token">=</SPAN> arcpy<SPAN class="punctuation token">.</SPAN>Polyline<SPAN class="punctuation token">(</SPAN>arr<SPAN class="punctuation token">)</SPAN>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; row<SPAN class="punctuation token">[</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">]</SPAN> <SPAN class="operator token">=</SPAN> newLine
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; cursor<SPAN class="punctuation token">.</SPAN>updateRow<SPAN class="punctuation token">(</SPAN>row<SPAN class="punctuation token">)</SPAN>‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

Reference: arcpy - Delete middle vertex of multiple 3-vertex polylines - Geographic Information Systems Stack Exchange

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