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Rebinning reduced to interpolation / extrapolation

This commit is contained in:
Lukas Klass 2020-04-08 17:29:24 +02:00
parent 08f672caaa
commit e52fcdd71b
1 changed files with 22 additions and 17 deletions
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39
esbo_etc/classes/SpectralQty.py
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@ -1,6 +1,7 @@
from esbo_etc.lib.helpers import error
import numpy as np
from scipy.integrate import cumtrapz
# import numpy as np
# from scipy.integrate import cumtrapz
from scipy.interpolate import interp1d
import astropy.units as u
import math
@ -65,22 +66,26 @@ class SpectralQty:
if wl.unit != self.wl.unit:
error("Mismatching units for rebinning: " + wl.unit + ", " + self.wl.unit)
idx = np.where(np.logical_and(self.wl > 0.9 * wl.min(), self.wl < 1.1 * wl.max()))[0]
wl_old = self.wl[idx]
qty_old = self.qty[idx]
# idx = np.where(np.logical_and(self.wl > 0.9 * wl.min(), self.wl < 1.1 * wl.max()))[0]
# wl_old = self.wl[idx]
# qty_old = self.qty[idx]
#
# if np.diff(wl_old).min() < np.diff(wl).min():
# # Binning
# c = cumtrapz(qty_old, x=wl_old) * qty_old.unit * wl_old.unit
# print(c)
# xpc = wl_old[1:]
#
# delta = np.gradient(wl)
# new_c_1 = np.interp(wl - 0.5 * delta, xpc, c, left=0.0, right=0.0) * c.unit
# new_c_2 = np.interp(wl + 0.5 * delta, xpc, c, left=0.0, right=0.0) * c.unit
# qty = (new_c_2 - new_c_1) / delta
# else:
# # Interpolation
# qty = np.interp(wl, wl_old, qty_old, left=0.0, right=0.0)
if np.diff(wl_old).min() < np.diff(wl).min():
# Binning
c = cumtrapz(qty_old, x=wl_old) * qty_old.unit * wl_old.unit
xpc = wl_old[1:]
delta = np.gradient(wl)
new_c_1 = np.interp(wl - 0.5 * delta, xpc, c, left=0.0, right=0.0) * c.unit
new_c_2 = np.interp(wl + 0.5 * delta, xpc, c, left=0.0, right=0.0) * c.unit
qty = (new_c_2 - new_c_1) / delta
else:
# Interpolation
qty = np.interp(wl, wl_old, qty_old, left=0.0, right=0.0) * qty_old.unit
f = interp1d(self.wl, self.qty, fill_value="extrapolate")
qty = f(wl) * self.qty.unit
self.wl = wl
self.qty = qty