topic Re: Flipping Lines in Python Questions

Flipping Lines

ManojBanga — Fri, 24 Jun 2011 13:21:19 GMT

Hi all!

I am looking for a python script which can flip all the lines in one direction.

Either north for vertical and east for horizontal lines.

Thanks
Manoj

Re: Flipping Lines

ManojBanga — Mon, 27 Jun 2011 09:55:34 GMT

Hi All!

any solution to this please?

Re: Flipping Lines

JakeSkinner — Mon, 27 Jun 2011 13:52:23 GMT

If you have an ArcEditor license for ArcGIS 10 you can use the 'arcpy.FlipLine_edit' function to reverse the direction of your polyline data.

Re: Flipping Lines

ManojBanga — Tue, 28 Jun 2011 10:55:06 GMT

Thanks Jake

but this is not what I am looking for, flip tool just reverse the current direction.

I need a script or method to flip all the lines in ONE DIRECTION. It can be eaither North or East depending on if its closer to vertical or horizontal direction.

Thanks

Re: Flipping Lines

DarrenWiens2 — Sun, 12 Dec 2021 00:50:22 GMT

I can't write the actual script right now, but here's the method I would follow, in python:

read your lines into a search cursor

for each line in the cursor:
    get the first and last point coordinates
    calculate the change in x # first minus last, negative = W->E
    calculate the change in y # first minus last, negative = S->N
    if the absolute change in x is greater than the absolute change in y: # the line is in horizontal orientation
        if the change in x is positive: # line is E->W
            send line to new feature class to be flipped
            delete line from current feature class
    else: #the line is vertical
        if the change in y is positive: # the line is N->S
            send line to new feature class to be flipped
            delete line from current feature class
flip lines in new feature class
merge flipped lines back into original feature class