I'm trying to implement a transformation of x and y coordinates for line features of a Shapefile. geopandas.set_geometry() isn't setting the x and y coordinates and isn't giving me any errors.

Here is my code:

import shapely
import geopandas as gpd

def calcNewXY(geom):
    return geom.geometry.map(
        lambda line: shapely.ops.transform(lambda x, y: (x - 100000, y - 10000), line)

data = gpd.read_file(inFile)

The actual coordinate transformation works, I debugged this part. Maybe somebody can shed some light on what I'm missing here.


inplace=True has to be set as suggested by @mikewatt

data.set_geometry(calcNewXY(data), inplace=True)
  • just an error because i simplified the x and y calculation. this part acutally works. i checked that.
    – zwnk
    Jan 4 at 21:07
  • 2
    Can you provide some data sample for reproducibility? Jan 4 at 21:15
  • 2
    shapely.ops.transform takes two args, func and geom. You're only feeding in func as written, it should be throwing a syntax error. If I were you I'd re-write this using named functions to make it easier to debug, nested lambdas is a lil messy
    – mikewatt
    Jan 4 at 21:22
  • 2
    Got it. Works now. Looks like you need data.set_geometry(calcNewXY(data), inplace=True) to avoid creating a new object: geopandas.org/en/stable/docs/reference/api/…
    – mikewatt
    Jan 4 at 21:50
  • 2
    Please put your edit as a valid answer!
    – Taras
    Jan 4 at 22:07

1 Answer 1


Another possible solution is to overwrite the data i.e.

data = data.set_geometry(calcNewXY(data))

See GeoPandas documentation for more details.

  • 2
    This is preferable to operating in-place and it opens the possibility to chain additional operations
    – Paul H
    Jan 4 at 22:58

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