Reproject BedMachine Antarctica to lat/lon

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Reproject BedMachine Antarctica to lat/lon

by EarthdataForumContributor » Thu Apr 28, 2022 4:27 pm America/New_York

I have downloaded MEaSUREs BedMachine Antarctica data, and I would like to reproject it from Antarctic Polar Stereographic projection to geodetic latitude/longitude. I would appreciate any guidance on how to do this. Thanks!


NSIDC - danicalinda.cantarero
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Re: Reproject BedMachine Antarctica to lat/lon

by NSIDC - danicalinda.cantarero » Thu Apr 28, 2022 4:31 pm America/New_York

You can take a look at the Python ( and Matlab (xy2ll.m) scripts in this GitHub repository: to convert between polar stereographic coordinates to geodetic lat/lon.

Here's an example Python script to use for the reprojection:

Code: Select all

from xy2ll import xy2ll
import numpy as np

xs = np.linspace(-3333000, -500, 6666)
ys = np.linspace(500, -3333000, 6666)

to_lat = []
to_lon = []

for x, y in zip(xs,ys):
	lat, lon = xy2ll(x, y, -1, 0, 71)
The GitHub repository mentioned above also includes scripts to convert from geodetic lat/lon to polar stereographic coordinates (ll2xy.m and Matlab and Python scripts for interpolating BedMachine Antarctica data onto user-defined coordinates are also available (interpBedmachineAntarctica.m and

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