topic Split polygon in Python Questions

Split polygon

CaseyBentz — Wed, 28 Sep 2011 13:25:01 GMT

I am looking for a way to split a polygon envelope into 4 equal size pieces. I have used the Feature Envelope to Polygon GP tool, I then added fields to get the mid x and mid y of the envelope. Now, I want to split that polygon into 4 pieces. Does anyone know how to do this?

Casey

Re: Split polygon

JakeSkinner — Wed, 28 Sep 2011 15:44:24 GMT

I would recommend using the 'Create Fishnet' tool to create a polygon envelope of 4 equal pieces. You can use a feature class as the extent and then simply specify the number of columns and rows.

Re: Split polygon

CaseyBentz — Wed, 28 Sep 2011 15:47:07 GMT

Thanks Jake.

I have just stumbled onto this tool myself. I have a feature class of hundreds of polygons and I want this for each one. I have tried using it in a Model using Make Feature Layer for each one of my polygons and it does not appear to respect the geometry of feature layer but the geometry of the feature class. Any ideas? I have resorted to exporting each feature to its own feature class.

Re: Split polygon

JakeSkinner — Sun, 12 Dec 2021 03:08:29 GMT

Hi Casey,

I was able to get this to work with the following code. It will loop through each feature in a feature class and create a 2x2 fishnet for each feature.

import arcpy
from arcpy import env
env.workspace = r"C:\temp\python\test.gdb"
env.overwriteOutput = True

fc = "Airports"

rows = arcpy.SearchCursor(fc)
for row in rows:
    x = row.OBJECTID
    arcpy.MakeFeatureLayer_management(fc, "fc_lyr", "OBJECTID = " + str(x))
    rows2 = arcpy.SearchCursor("fc_lyr")
    for row2 in rows2:
        XMIN = row2.shape.extent.XMin
        YMIN = row2.shape.extent.YMin
        XMAX = row2.shape.extent.XMax
        YMAX = row2.shape.extent.YMax
        YMIN2 = row2.shape.extent.YMin + 10
        orig_coord = str(XMIN) + " " + str(YMIN)
        y_axis = str(XMIN) + " " + str(YMIN2)
        corner_coord = str(XMAX) + " " + str(YMAX)
        arcpy.CreateFishnet_management("Fishnet_" + str(x), orig_coord, y_axis, "0", "0", "2", "2", corner_coord, "NO_LABELS", "", "POLYGON")

del row, rows, row2, rows2