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Model Builder - Calculate the centroid of a polygon

MaryMulholland

I would like to calculate the centroid (x and y co-ordinate) of a polygon using model builder - ArcGIS 10.1 Standard. I don't have access to the tool Feature to Point as the standard licence doesn't allow this option and there doesn't seem to be a Calculate Geometry tool within model builder. Can anyone help please

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Accepted answers

JakeSkinner

Hi Mary,

You can do this using the Calculate Field tool. Here is an example how to set it up.

[ATTACH=CONFIG]23900[/ATTACH]

To do the Y centroid, simply change the line:

return shape.centroid.X

to:

return shape.centroid.Y

screen.png

All comments

JakeSkinner

Hi Mary,

You can do this using the Calculate Field tool. Here is an example how to set it up.

[ATTACH=CONFIG]23900[/ATTACH]

To do the Y centroid, simply change the line:

return shape.centroid.X

to:

return shape.centroid.Y

screen.png

RobertBorchert

If you create two new fields in your feature table make the double precision fields. One for X one for Y.

In an edit session right click on the X field and choose calculate geometry. From the drop down menu choose X coordinate of centroid. Then do the same for Y

I would like to calculate the centroid (x and y co-ordinate) of a polygon using model builder - ArcGIS 10.1 Standard. I don't have access to the tool Feature to Point as the standard licence doesn't allow this option and there doesn't seem to be a Calculate Geometry tool within model builder. Can anyone help please

MaryMulholland

Hi Jake

Thanks for your reply. I added the code and it calculates the x and y fields. However the model seems to be stuck in a loop, how do I get it to stop after it calculates the x and y fields?

JakeSkinner

Can you post a screen shot of your model?

MaryMulholland

Jake

I got it to work, I had to add the process 'make xy event layer' which stopped the loop. I am not sure how to mark this thread as answered.

Thanks again for your help.

JakeSkinner

Good to hear this is working. You can mark a thread as answered by clicking the green check mark next to the response that answered your question.

lanadonaldson1

Apologies!! I am coming into this thread several years too late. I am literally trying to accomplish the exact same thing but I can't get my python code right...I see your original attachment is no longer...I've followed the steps in the scrn shot of the calcutalor but I am so new to python...i'm probably missing an exclamation mark or something ridiculous....here's hoping you can help me as well. I've been googling python snippets all day and can't seem to find what works.

thanks as always

Lana

lanadonaldson1

thanks as always

Lana

DarrenWiens2

lana donaldson, post your code and we can help. Or, better yet, start a new question, since this one is answered.

deleted-user-ioozWOYc0nD1

The code given in the answer works great, but is there a way to return latitude, longitude instead of Y, X?

AbdullahAnter

Try add @ DECIMALDEGREES ! at the end of line

<SPAN class="keyword token">return</SPAN> shape<SPAN class="punctuation token">.</SPAN>centroid<SPAN class="punctuation token">.</SPAN>Y@DECIMALDEGREES !<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

deleted-user-ioozWOYc0nD1

Thanks for the suggestion, Abdullah. However, doing so in the Code Block returns a Python syntax error (000989):

Used the modifier in the Expression [yCentroid(!Shape@DECIMALDEGREES!] returned a different Python error (000539), indicating that there is an invalid field used, namely "the distance method is not a valid method of the geometry object".

I'm using NAD_1983_StatePlane_Colorado_South_FIPS_0503_Feet.

This calculation works fine using Calculate Geometry (from the attribute table):

Is there a way to view the log of the centroid calc process used by the Calculate Geometry tool?

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