2

Using ArcGIS 10.3, I am working with a shapefile with millions of small polygons. I am using python to assign buffer widths to each polygon as an attribute. The buffer widths vary, and some polygons are assigned a buffer width of 0. This presents two issues when I use the buffer tool:

  1. Polygons assigned a width of 0 receive Warning 000636, because the buffer tool assigns them a null geometry. The sheer volume of these warning messages results in a crash if using the python interpreter in ArcMap (useful for code demonstrations).
  2. The polygons themselves are excluded from the final output.

I still need the excluded polygons in the buffer output. I would also prefer not to return a few thousand warnings. For now, my workaround is to assign a buffer width of 0.001 instead of 0. Can anyone give me a better workaround for this issue?

Note: I have found ArcGIS Buffer tool leaves out zero width buffers? that addresses this issue, but the answer does not provide the guidance I am looking for.

5

As it says in the documentation that the other question quotes: the buffer tool does not work that way.

The work-around would be:

  1. Export the features that you don't want to buffer to a separate feature class.
  2. Buffer only the features that have valid buffer distances. You could first run a Select and export them to their own feature class. Then, buffer that dataset.
  3. Merge those two results.
2

Another option:

  1. Select by attributes (buffer > 0)
  2. Run the buffer tool (will only run on the selection)
  3. Switch the selection and append to the buffer output (use 'switch selection' or select by attributes (buffer = 0).
  • Jbalk - I really like this answer, I didn't know that you could selectively buffer polygons in a shapefile. This actually opens up some very interesting possibilities. It works well in combination with Tom's answer: if you are averse to creating a new feature layer (which would be required to use your selection method in arcpy), Tom's method works well; if memory isn't a restriction, your method may be more streamlined. Thank you! – Chris Nov 11 '16 at 21:13
  • Hi Chris. I'm glad you got something out of it. For your info - if you have a selection on your feature class, geoprocessing tools in ArcGIS will only run on the selected features. If you find my answer useful could you please upvote it? Thanks. – jbalk Nov 14 '16 at 3:48
  • I like your answer better than my own. – Tom Jun 3 at 14:55

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