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replace interp2d in utils_findsat_mrt #210

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merged 3 commits into from
Aug 27, 2024
Merged

replace interp2d in utils_findsat_mrt #210

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ac145d6
replace interp2d with RegularGridInterpolator
dvstark Aug 27, 2024
9b1306e
pep8 and flake8 formatting fixes
dvstark Aug 27, 2024
05459df
Merge branch 'spacetelescope:master' into interp2d_fix
dvstark Aug 27, 2024
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18 changes: 13 additions & 5 deletions acstools/utils_findsat_mrt.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1432,16 +1432,24 @@ def create_mrt_line_kernel(width, sigma, outfile=None, shape=(1024, 2048),
LOG.info('Inteprolating onto new grid to center kernel')
theta_arr = np.arange(cutout.shape[1])
rho_arr = np.arange(cutout.shape[0])
theta_grid, rho_grid = np.meshgrid(theta_arr, rho_arr)

new_theta_arr = theta_arr + theta_shift
new_rho_arr = rho_arr + rho_shift
new_theta_grid, new_rho_grid = np.meshgrid(new_theta_arr, new_rho_arr)

# inteprolate onto new grid
f = interpolate.interp2d(theta_grid, rho_grid, cutout.data,
kind='cubic')
cutout = f(new_theta_arr, new_rho_arr) # overwrite old cutout
f = interpolate.RegularGridInterpolator((rho_arr, theta_arr),
cutout.data,
bounds_error=False,
fill_value=0,
method='cubic')

# unable to provide 2D grid of points for interpolation. Switching to
# 1D, and then will switch back
points = [[r, t] for r, t in zip(np.ravel(new_rho_grid),
np.ravel(new_theta_grid))]

# return to original shape and replace the old cutout
cutout = np.reshape(f(points), cutout.data.shape)

if ax:
fig4, ax4 = plt.subplots()
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