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I have 1 single shapefile of about 70k square polygons in a grid. I want to run a process/tool/script to split all 70k polygons into 4 equal parts. The polygons are contiguous, so each polygon only has 4 vertices. Basically I have a shapefile of sections for a sate, and I want to split it into 1/4 sections so each original square section is broken into 4 equal 1/4 parts.

How can I split all 70,000 contiguous square polygons at once with only 4 vertices each into 4 equal parts to create 4 polygons within each original polygon?

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Assuming your polygon dataset is a regular grid of polygons, rather than square polygons randomly placed everywhere then this can be achieved with a simple model to create a fishnet then retrospectively delete out the polygons you do not need.

The model to achieve this is this:

Model

Here is final output applied to the original grid (red outlines):

UK grid quartered

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Here is set of ArcGIS Tools specifically built to subdivide Public Land Survey Sections. One of the tools will create Quarter Sections. http://ianbroad.com/creating-quarter-quarter-section-grid-python/.

  • This was exactly what I needed! Thank you for posting your response, and assisting me in what could have been a very daunting task! – Andy Bartell Aug 25 '16 at 13:15
  • Not sure why that last guy didn't upvote, but this tool is perfect. With irregular grids (not North/South), fishnets aren't ideal and this tool saved me having to go into the weeds with a custom model. Thanks! – AlecZ Jan 11 '18 at 19:51

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