Hello All,
I am new to python and I'm in the learning/testing phase.
From borrowing various snipits, I am calculating the azimuth of a line segment then attempting to write that value to the attribute table. Here's my code, then I'll get to the question.
I am able to get the angle_deg value and my commented angleList list works but I'm not sure where/how to use it. I know my UpdateCursor is in the wrong spot. It updates the first angle_deg value for all records. Is there a way to use the UpdateCursor to write the value of the angle_deg variable for each record?
Or would it be best to try to use the angleList list with an UpdateCursor and if so, how do you use a list to feed an UpdateCursor?
Thank you for any help you can provide.
Wesley
I am new to python and I'm in the learning/testing phase.
From borrowing various snipits, I am calculating the azimuth of a line segment then attempting to write that value to the attribute table. Here's my code, then I'll get to the question.
Code:
import arcpy
from arcpy import env
from math import atan2, pi
env.workspace = "c:/my_data/test_data.gdb"
fc = "polyline1"
# polyline1 has pre-created "azimuth" field and is a single segment feature class
#angleList []
angleMath = arcpy.da.SearchCursor(fc, ["OID@", "SHAPE@"])
for row in angleMath:
startpt = row[1].firstPoint
x1 = startpt.X
y1 = startpt.Y
endpt = row[1].lastPoint
x2 = endpt.X
y2 = endpt.Y
deltax = x2 - x1
deltay = y2 - y1
angle_rad = atan2(deltay,deltax)
angle_deg = angle_rad*180.0/pi
#angleList.append
cursor = arcpy.UpdateCursor(fc)
for upRow in cursor:
upRow.azimuth = angle_deg
cursor.updateRow(upRow)
del cursor
del angleMathOr would it be best to try to use the angleList list with an UpdateCursor and if so, how do you use a list to feed an UpdateCursor?
Thank you for any help you can provide.
Wesley