topic Create Polygons from Lat and Long coordinates through Python in Python Questions

Create Polygons from Lat and Long coordinates through Python

JamesFitzgerald — Tue, 08 Apr 2014 20:28:52 GMT

Hello,
I have a problem. I want to create polygons by using the X and Y values from a CSV file. I have borrowed a script and edited to work with my data. The only problem is the script runs for only one set of values. Not both. I have a location and from the location it draws a polygon that is 20000 square feet and it does not recognise the second set of coordinates.

I believe I am missing a split line? Or not.

import arcpy, csv, os
from arcpy import env

env.overwriteOutput = True
infile = "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\XY_EVENT_.csv"

point = arcpy.Point()
array = arcpy.Array()
featureList= []

curXY = arcpy.da.SearchCursor(infile, ["X","Y"])


for row in curXY:
    X = float (row[1])
    Y = float (row[0])

    highX = X+ 148.7
    highY = Y + 134.5
    array = arcpy.Array([arcpy.Point(X, Y), arcpy.Point(highX, Y),
    arcpy.Point(highX, highY), arcpy.Point(X, highY), arcpy.Point(X, Y)])

polygon = arcpy.Polygon(array)
featureList.append(polygon)

arcpy.CopyFeatures_management(featureList, "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\Test_CUVA.gdb\Poly33")



print arcpy.GetMessages()

Re: Create Polygons from Lat and Long coordinates through Python

WilliamCraft — Wed, 09 Apr 2014 00:34:20 GMT

Can you re-post your code using the CODE wrap button (once you highlight all the code, press the button with the pound sign) so that we can see the indentation you're using? Thanks!

Re: Create Polygons from Lat and Long coordinates through Python

JamesFitzgerald — Sun, 12 Dec 2021 08:21:24 GMT

import arcpy, csv, os
from arcpy import env

env.overwriteOutput = True
infile = "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\XY_EVENT_.csv"



point = arcpy.Point()
array = arcpy.Array()
featureList= []

curXY = arcpy.da.SearchCursor(infile, ["X","Y"])





for row in curXY:
    X = float (row[1])
    Y = float (row[0])
    
    highX = X+ 148.7
    highY = Y + 134.5
    array = arcpy.Array([arcpy.Point(X, Y), arcpy.Point(highX, Y),
    arcpy.Point(highX, highY), arcpy.Point(X, highY), arcpy.Point(X, Y)])

polygon = arcpy.Polygon(array)
featureList.append(polygon)

arcpy.CopyFeatures_management(featureList, "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\Test_CUVA.gdb\Poly33")


    

print arcpy.GetMessages()

Re: Create Polygons from Lat and Long coordinates through Python

WilliamCraft — Wed, 09 Apr 2014 10:41:26 GMT

From looking at your code, I've made my suggested changes below in bold:

import arcpy, csv, os from arcpy import env  env.overwriteOutput = True infile = "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\XY_EVENT_.csv"  point = arcpy.Point() array = arcpy.Array() featureList= []  curXY = arcpy.da.SearchCursor(infile, ["X","Y"])  for row in curXY:     X = float (row[1])     Y = float (row[0])          highX = X+ 148.7     highY = Y + 134.5     array = arcpy.Array([arcpy.Point(X, Y), arcpy.Point(highX, Y),     arcpy.Point(highX, highY), arcpy.Point(X, highY), arcpy.Point(X, Y)])      polygon = arcpy.Polygon(array)     featureList.append(polygon)  arcpy.CopyFeatures_management(featureList, "U:\Tax\Special Projects\JEFitzgerald\CUVA\Test\Test_CUVA.gdb\Poly33")  print arcpy.GetMessages()

I think if you indent the two bolded lines above,then each time you construct your array to generate a polygon you will append it to the feature list. After iterating through all of the curXY rows in your CSV, you can execute one CopyFeatures operation (as you're already doing) to push everything from the feature list to the file geodatabase.

Re: Create Polygons from Lat and Long coordinates through Python

JamesFitzgerald — Wed, 09 Apr 2014 14:32:53 GMT

Thank you very much! Your suggestion worked! It also will save me a great deal of time!

Thanks again,
J

Re: Create Polygons from Lat and Long coordinates through Python

WilliamCraft — Wed, 09 Apr 2014 14:33:42 GMT

Great, glad to hear it! Please mark the correct answer with the green check.