topic Create Polygon.shp from Point.shp using Python Code in Python Questions

Create Polygon.shp from Point.shp using Python Code

JamesFitzgerald — Thu, 10 Apr 2014 10:48:27 GMT

Hello, I have a question about the code below. Do I create default point and polygon shapefiles or do I neet to add attributes to the point and polygon shapefiles. I have been trying to work on this code and have not been able to get it to work. Not sure about shortList and pointList. This code has been copied from another post.

import arcpy pointFC =  r"C:\Users\whitley-wayne\Desktop\summary\data.gdb\funds" polygonFC = r"C:\Users\whitley-wayne\Desktop\summary\data.gdb\hab60" pointList = []  with arcpy.da.SearchCursor(pointFC, "SHAPE@XY") as cursor:     for row in cursor:         shortList = list(row[0])         pointList.append(shortList)  with arcpy.da.InsertCursor(polygonFC, ["SHAPE@"]) as c:     for pnt in pointList:         #   start with the lower left         lowX = pnt[0]         lowY = pnt[1]         #   find the upper right         highX = lowX + 20         highY = lowY + 20         array = arcpy.Array([arcpy.Point(lowX, lowY),                              arcpy.Point(lowX, highY),                              arcpy.Point(highX, highY),                              arcpy.Point(highX, lowY),                              arcpy.Point(lowX, lowY)])         polygon = arcpy.Polygon(array)         c.insertRow([polygon])

Re: Create Polygon.shp from Point.shp using Python Code

JamesFitzgerald — Thu, 10 Apr 2014 20:52:20 GMT

Here is the correct way...http://resources.arcgis.com/en/help/main/10.1/index.html#/Reading_geometries/002z0000001t000000/

import arcpy  fc= r"U:\\Tax\\Special Projects\\JEFitzgerald\\CUVA\\Test\\Points.shp" polygonFC= r"U:\\Tax\\Special Projects\\JEFitzgerald\\CUVA\Test\\Polygon.shp" pointList=[]  ####CODE VERSION#### #for row in arcpy.da.SearchCursor (fc, [ "OID@", "SHAPE@XY"]):     #print ("feature {0}:".format(row[0]))     #print row[1]    #****  CODE    ****# with arcpy.da.SearchCursor (fc, ["SHAPE@XY"]) as cursor:     for row in cursor:         xy = row[0]         pointList.append(xy)        #print ("{0}, {1}".format(x,y))          with arcpy.da.InsertCursor (polygonFC, ["SHAPE@"]) as U:     for pnt in pointList:         lowX = pnt[0]         lowY = pnt[1]         #   find the upper right         highX = lowX + 163.1935         highY = lowY + 183.831         array = arcpy.Array([arcpy.Point(lowX, lowY),                              arcpy.Point(lowX, highY),                              arcpy.Point(highX, highY),                              arcpy.Point(highX, lowY),                              arcpy.Point(lowX, lowY)])         polygon = arcpy.Polygon(array)         U.insertRow([polygon])

Re: Create Polygon.shp from Point.shp using Python Code

T__WayneWhitley — Fri, 11 Apr 2014 17:01:41 GMT

If interested, Xander takes this type thing a step further in adding the option of rotating your geometries!
http://forums.arcgis.com/threads/96637-Create-diamond-around-point#10

Cleverly written and is a further lesson in manipulating geometry via Python.