Rotating a Map

How to rotate a map.

import matplotlib.pyplot as plt

import astropy.units as u

import sunpy.data.sample
import sunpy.map

We start with the sample data.

aia_map = sunpy.map.Map(sunpy.data.sample.AIA_171_IMAGE)

GenericMap provides the rotate() method which accepts an angle. This returns a rotated map and does not modify the original map. The data array size is expanded so that none of the original data is lost due to cropping.

aia_rotated = aia_map.rotate(angle=30 * u.deg)

Let’s now plot the results.

fig = plt.figure()
ax = fig.add_subplot(projection=aia_rotated)
aia_rotated.plot(axes=ax, clip_interval=(1, 99.99)*u.percent)
aia_rotated.draw_limb(axes=ax)
aia_rotated.draw_grid(axes=ax)
plt.show()

🏷 Tags: Map, AIA