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Create polygon / fc from map extent

MatthiasAbele

Hallo,

there are several topics on different forums concerning this matter, but
I haven't found a hint how to this in ArcGIS 10.

Do you have an idea or a code snippet?

Thanx,

Matthias

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AmbroseClarke

Old thread I know - but there is now an easy way in case anyone searching...

arcpy.Extent has a polygon property that neatly returns the extent as a polygon

ex&nbsp; <SPAN class="operator token">=</SPAN> extent<SPAN class="punctuation token">.</SPAN>polygon‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

CraigPrisland1

Darren,

This code you modified worked well. I did have one other question if possible. The "Polygon_Extent" layer that gets outputted does not contain any fields. Is it possible to incorporate the field that was used to create the Data Driven Pages from (i.e. the index layer) into the outputted layer?

Thanks again

CraigPrisland1

Darren,

This is exactly what I was looking for. Thank you very much!

DarrenWiens2

You can modify Jake Skinner's code as below to accommodate DDPs (mostly tested):

import arcpy  
from arcpy import env  
from arcpy import mapping  
  
env.workspace = r"C:\temp\Test.gdb"  

extents = []  
mxd = mapping.MapDocument(r"C:\temp\python\Philadelphia.mxd")  
for pageNum in range(1, mxd.dataDrivenPages.pageCount + 1):
     mxd.dataDrivenPages.currentPageID = pageNum
     dataframe = mapping.ListDataFrames(mxd, "*")[0]  
     frameExtent = dataframe.extent  
     XMAX = frameExtent.XMax  
     XMIN = frameExtent.XMin  
     YMAX = frameExtent.YMax  
     YMIN = frameExtent.YMin  
     pnt1 = arcpy.Point(XMIN, YMIN)  
     pnt2 = arcpy.Point(XMIN, YMAX)  
     pnt3 = arcpy.Point(XMAX, YMAX)  
     pnt4 = arcpy.Point(XMAX, YMIN)  
     array = arcpy.Array()  
     array.add(pnt1)  
     array.add(pnt2)  
     array.add(pnt3)  
     array.add(pnt4)  
     array.add(pnt1)  
     polygon = arcpy.Polygon(array) 
     extents.append(polygon)

arcpy.CopyFeatures_management(extents, "Polygon_Extent")

CraigPrisland1

I have been looking for something like this for a little while now and the Python script that was posted here a few years back worked great. Thnaks for that! However, would it be possible to run something like this on multiple pages? I used Data Driven Pages to create several pages and would like a feature class or shapefile of the map extent of all of these pages. I noticed that this script will only output the first page.

Thanks in advance and I appreciate the assistance!

DakshataShahi1_1-1755608284607.png

JakeSkinner

Take a look at this thread.

MatthiasAbele

Hallo JSkinn3,

thany, the code works perfectly. Is it possible to loop through a folder, which contains several
mxds and store all polygons in one fc?

Yours,

Matthias

JakeSkinner

Hi Matthias,

Here is a code sample. The code grabs the extent from an MXDs data frame, creates an array, and then converts the array to a polygon feature class.

import arcpy
from arcpy import env
from arcpy import mapping

env.workspace = r"C:\temp\Test.gdb"

mxd = mapping.MapDocument(r"C:\temp\python\Philadelphia.mxd")
dataframe = mapping.ListDataFrames(mxd, "*")[0]
frameExtent = dataframe.extent
XMAX = frameExtent.XMax
XMIN = frameExtent.XMin
YMAX = frameExtent.YMax
YMIN = frameExtent.YMin
pnt1 = arcpy.Point(XMIN, YMIN)
pnt2 = arcpy.Point(XMIN, YMAX)
pnt3 = arcpy.Point(XMAX, YMAX)
pnt4 = arcpy.Point(XMAX, YMIN)
array = arcpy.Array()
array.add(pnt1)
array.add(pnt2)
array.add(pnt3)
array.add(pnt4)
array.add(pnt1)
polygon = arcpy.Polygon(array)
arcpy.CopyFeatures_management(polygon, "Polygon_Extent")

DakshataShahi1_0-1755608229322.png

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