Overlapping Polylines to Overlapping Polygons

ChelseaKarthauser — Wed, 14 Mar 2018 00:01:43 GMT

I am writing a script that begins with a polyline feature class. The polylines represent the outlines of images from a flight path, so they are overlapping considerably. I take several steps to convert these image outlines into a single polygon feature class that maintains each image footprint and their overlap.

Here are the steps in my current script:

#Split polyline feature by attributes into separate FCs

#This results in one feature class per polyline feature
arcpy.SplitByAttributes_analysis("Polylines", GDB, "Image")

#Create a list of all polyline FCs
Polyline_List = arcpy.ListFeatureClasses("image*")

#Use a for loop to work with FC list; convert all polylines to polygons

#This results in one feature class per polygon feature

   for FC in Polyline_List:
      output = FC.replace("image","poly")
      arcpy.FeatureToPolygon_management (FC, output)
      arcpy.Delete_management(FC)

   #Create FC list of all polygons FCs; use list to merge polygons into single FC
   Polygon_List = arcpy.ListFeatureClasses("poly*")
   arcpy.Merge_management(Polygon_List,"All_Polygons")

#Join Polygon FC to Polyline FC to transfer attribute information
arcpy.AddJoin_management("All_Polygons","OBJECTID","Polylines","OBJECTID")

#Export Polygon FC to make joined data permanent
arcpy.FeatureClassToFeatureClass_conversion("All_polygons",GDB,"Polygons")

I know that there are several custom tools out there that will accomplish this, but I would like to learn how to do this in my own script. Some of my polyline datasets are 350+ images, and exporting out each polyline and then converting each one separately takes forever. There must be an easier way! I'll also add that I used each image's corner coordinates to create the closed polylines. If there is a way to jump right from the corner coordinates to one polygon feature class, that would be even better!

Below is a link to an old thread addressing this problem:

How to convert overlapping polylines to overlapping polygons

Thanks!

Re: Overlapping Polylines to Overlapping Polygons

ChelseaKarthauser — Thu, 12 Apr 2018 16:32:33 GMT

In my original question, I needed a way to process quickly through point data that represented corner coordinates of overlapping images from a flight path. I wanted to create a single polygon feature class containing all of the image "footprints."

I figured this out using geometries and insert cursor. The workflow is much simpler and faster that the original workflow.

The .py file is also attached

topic Overlapping Polylines to Overlapping Polygons in Spatial Data Science Questions

Overlapping Polylines to Overlapping Polygons

Re: Overlapping Polylines to Overlapping Polygons