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import numpy as np
import xarray as xr
import ancillary_data as anc

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from numpy.lib.stride_tricks import sliding_window_view
_dtr = np.pi/180
# this case is written for the 11-12um Cirrus Test for scenes that follow pattern 1 (see note below)
def prepare_thresholds(data, thresholds):
coeff_values = np.empty((data.M01.shape[0], data.M01.shape[1], 2))
coeff_values[:, :, 0] = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['coeffs'][0])
coeff_values[:, :, 1] = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['coeffs'][1])
cmult_values = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['cmult'])
adj_values = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['adj'])

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if 'bt1' in list(thresholds['11-12um_Cirrus_Test']):
bt1 = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['bt1'])
else:
bt1 = np.full(data.M01.shape, -999)
if 'lat' in list(thresholds['11-12um_Cirrus_Test']):
lat = np.full(data.M01.shape, thresholds['11-12um_Cirrus_Test']['lat'])
else:
lat = np.full(data.M01.shape, -999)
thr_dict = {'coeffs': (['number_of_lines', 'number_of_pixels', 'z'], coeff_values),
'cmult': (['number_of_lines', 'number_of_pixels'], cmult_values),

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'adj': (['number_of_lines', 'number_of_pixels'], adj_values),
'bt1': (['number_of_lines', 'number_of_pixels'], bt1),
'lat': (['number_of_lines', 'number_of_pixels'], lat),
}
return xr.Dataset(data_vars=thr_dict)

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# 3. Others
# - Land_Night
# - Polar_Night_Land
# - Polar_Night_Snow
# - Day_Snow
# - Night_Snow

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def preproc(data, thresholds, scene):
cosvza = np.cos(data.sensor_zenith * _dtr)
schi = (1/cosvza).where(cosvza > 0, 99.0)
schi = schi.values.reshape(np.prod(schi.shape))
m15 = data.M15.values.reshape(np.prod(data.M15.shape))
thr = anc.py_cithr(1, schi, m15)
thr = thr.reshape(data.M15.shape)
schi = schi.reshape(data.M15.shape)
# thr_xr = xr.Dataset(np.full(data.sensor_zenith.shape, thresholds['coeffs']),
# dims=('number_of_lines', 'number_of_pixels'))
thr_xr = prepare_thresholds(data, thresholds)
midpt = thr_xr.coeffs[:, :, 0].where((thr < 0.1) | (np.abs(schi-99) < 0.0001), thr)
locut = midpt + (thr_xr.cmult * midpt)

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if scene in ['Land_Day', 'Land_Day_Coast', 'Land_Day_Desert', 'Land_Day_Desert_Coast',
'Ocean_Day', 'Ocean_Night', 'Polar_Ocean_Day', 'Polar_Ocean_Night']:
hicut = midpt - thr_xr.adj
elif scene in ['Polar_Day_Land', 'Polar_Day_Coast', 'Polar_Day_Desert',
'Polar_Day_Desert_Coast', 'Polar_Day_Snow']:
hicut = midpt - (thr_xr.adj * midpt)
elif scene in ['Land_Night', 'Polar_Night_Land', 'Polar_Night_Snow', 'Day_Snow', 'Night_Snow']:
_coeffs = {'Land_Night': 0.3, 'Polar_Night_Land': 0.3, 'Polar_Night_Snow': 0.3,
'Day_Snow': 0.0, 'Night_Snow': 0.3}
midpt = midpt - (_coeffs[scene] * locut)
if scene in ['Polar_Night_Land', 'Polar_Night_Snow', 'Night_Snow']:
hicut = (midpt - (0.2 * locut)).where(data.M15 < thr_xr.bt1, midpt - 1.25)
elif scene in ['Land_Night']:
hicut = -0.1 - np.power(90.0 - np.abs(data.latitude)/60, 4) * 1.15
hicut = hicut.where((data.M15 < thr_xr.bt1) & (data.latitude > thr_xr.lat), 1.25)
elif scene in ['Day_Snow']:
hicut = locut - (thr_xr.cmult * locut)
else:
print('Scene not recognized\n')
else:
print('Scene not recognized\n')
thr_out = xr.DataArray(data=np.dstack((locut, midpt, hicut, np.ones(locut.shape), np.ones(locut.shape))),
dims=('number_of_lines', 'number_of_pixels', 'z'))
return thr_out
# return locut, hicut, midpt
def preproc_sst(data, thresholds):
m31c = data.M15 - 273.16
m32c = data.M16 - 273.16
m31c_m32c = m31c - m32c
sstc = data.geos_sfct - 273.16
cosvza = np.cos(data.sensor_zenith*_dtr)
a = thresholds['coeffs']
modsst = 273.16 + a[0] + a[1]*m31c + a[2]*m31c_m32c*sstc + a[3]*m31c_m32c*((1/cosvza) - 1)
sfcdif = data.geos_sfct - modsst
return sfcdif
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def preproc_nir(data, thresholds, scene):
sza = data.solar_zenith
band_n = 2
# NOTE: the visud condition in the C code is equivalent to having sza <= 85
# For the time being the visud filtering is not implemented
a = np.array(thresholds[scene]['NIR_Reflectance_Test']['coeffs'])
vzcpow = thresholds['VZA_correction']['vzcpow'][0]
refang = data.sunglint_angle.values.reshape(np.prod(data.sunglint_angle.shape))
sunglint_thresholds = thresholds['Sun_Glint']
sunglint_flag = utils.sunglint_scene(refang, sunglint_thresholds).reshape(refang.shape)
nir_thresh = thresholds[scene]['NIR_Reflectance_Test']
hicut0 = a[0] + a[1]*sza + a[2]*np.power(sza, 2) + a[3]*np.power(sza, 3)
hicut0 = (hicut0 * 0.01) + nir_thresh['adj']
hicut0 = (hicut0 + nir_thresh['bias']).values.reshape(refang.shape)
midpt0 = hicut0 + (nir_thresh['midpt_coeff'] * nir_thresh['bias'])
locut0 = midpt0 + (nir_thresh['locut_coeff'] * nir_thresh['bias'])
thr = np.array([locut0, midpt0, hicut0, nir_thresh['thr'][3]*np.ones(refang.shape)])
cosvza = np.cos(data.sensor_zenith*_dtr).values.reshape(refang.shape)
corr_thr = np.zeros((4, refang.shape[0]))
corr_thr[:3, sunglint_flag == 0] = thr[:3, sunglint_flag == 0] * (1./np.power(cosvza[sunglint_flag == 0],
vzcpow))
corr_thr[3, sunglint_flag == 0] = thr[3, sunglint_flag == 0]
for flag in range(1, 4):
if len(refang[sunglint_flag == flag]) > 0:
dosgref = utils.get_sunglint_thresholds(refang, sunglint_thresholds, band_n, flag, thr)
corr_thr[:3, sunglint_flag == flag] = dosgref[:3, sunglint_flag == flag] * \
(1./np.power(cosvza[sunglint_flag == flag], vzcpow))
corr_thr[3, sunglint_flag == flag] = dosgref[3, sunglint_flag == flag]
corr_thr = np.transpose(corr_thr.reshape((4, sza.shape[0], sza.shape[1])), (1, 2, 0))
return corr_thr
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def preproc_surf_temp(data, thresholds):
thr_sfc1 = thresholds['Surface_Temperature_Test_1']
thr_sfc2 = thresholds['Surface_Temperature_Test_2']
thr_df1 = thresholds['Surface_Temperature_Test_df1']
thr_df2 = thresholds['Surface_Temperature_Test_df2']
max_vza = 70.13 # This values is set based on sensor. Check mask_processing_constants.h for MODIS value
rs = np.prod(data.M15.shape)
df1 = (data.M15 - data.M16).values.reshape(rs)
df2 = (data.M15 - data.M13).values.reshape(rs)
desert_flag = data.Desert.values.reshape(rs)
thresh = np.ones((rs, )) * thr_sfc1
idx = np.where((df1 >= thr_df1[0]) | ((df1 < thr_df1[0]) & ((df2 <= thr_df2[0]) | (df2 >= thr_df2[1]))))
thresh[idx] = thr_sfc2
idx = np.where(desert_flag == 1)
thresh[idx] == thr_sfc1
midpt = thresh
idx = np.where(df1 >= thr_df1[1])
midpt[idx] = thresh[idx] + 2.0*df1[idx]
corr = np.power(data.sensor_zenith.values/max_vza, 4) * 3.0
midpt = midpt.reshape(corr.shape) + corr
locut = midpt + 2.0
hicut = midpt - 2.0
thr_out = xr.DataArray(data=np.dstack((locut, midpt, hicut, np.ones(locut.shape), np.ones(locut.shape))),
dims=('number_of_lines', 'number_of_pixels', 'z'))
return thr_out

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def var_11um(data, thresholds):
rad = data.M15.values
var = np.zeros((rad.shape[0], rad.shape[1], 9))
var_thr = thresholds['Daytime_Ocean_Spatial_Variability']['dovar11']
test = sliding_window_view(np.pad(rad, [1, 1], mode='constant'), (3, 3)) - np.expand_dims(rad, (2, 3))
var[np.abs(test).reshape(rad.shape[0], rad.shape[1], 9) < var_thr] = 1
var = var.sum(axis=2)
return var
def get_b1_thresholds(data, thresholds):
ndvi = data.ndvi.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
sctang = data.scattering_angle.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
# this is hardcoded in the function
delta_ndvi_bin = 0.1
des_ndvi = thresholds['Misc']['des_ndvi']
thr_adj_fac_desert = thresholds['Misc']['adj_fac_desert']
thr_adj_fac_land = thresholds['Misc']['adj_fac_land']
ndvi_bnd1 = thresholds['Misc']['ndvi_bnd1']
ndvi_bnd2 = thresholds['Misc']['ndvi_bnd2']
fill_ndvi = thresholds['Misc']['fill_ndvi']
coeff1 = np.array(thresholds['Coeffs_Band1_land_thresh']).reshape(10, 3, 4)
coeff2 = np.zeros((10, 3, 4))
coeff2[:3, :, :] = np.array(thresholds['Coeffs_Band8_land_thresh']).reshape(3, 3, 4)
coeff = np.stack((coeff1, coeff2))
indvi = np.zeros(ndvi.shape)
indvi[ndvi >= ndvi_bnd2] = 9
x, y2 = np.zeros(ndvi.shape), np.zeros(ndvi.shape)
# this is equivalent to interp=1 in the C code
idx = np.nonzero((ndvi >= ndvi_bnd1) & (ndvi < ndvi_bnd2))
indvi[idx] = (ndvi[idx]/delta_ndvi_bin) - 0.5
indvi[ndvi < 0] = 0
x1 = delta_ndvi_bin*indvi + delta_ndvi_bin/2.0
x2 = x1 + delta_ndvi_bin
x[idx] = (ndvi[idx] - x1[idx])/(x2[idx] - x1[idx])
x = np.clip(x, 0, 1)
indvi = np.array(indvi, dtype=np.int)
thr = np.empty((ndvi.shape[0], 4))
thr_adj = np.empty((ndvi.shape[0], 4))
for i in range(3):
y1 = coeff[0, indvi, i, 0] + coeff[0, indvi, i, 1]*sctang + \
coeff[0, indvi, i, 2]*sctang**2 + coeff[0, indvi, i, 3]*sctang**3
des = np.nonzero(ndvi < des_ndvi)
y1[des] = coeff[1, indvi[des], i, 0] + coeff[1, indvi[des], i, 1]*sctang[des] + \
coeff[1, indvi[des], i, 2]*sctang[des]**2 + coeff[1, indvi[des], i, 3]*sctang[des]**3
y2[idx] = coeff[0, indvi[idx], i, 0] + \
coeff[0, indvi[idx], i, 1]*sctang[idx] + \
coeff[0, indvi[idx], i, 2]*sctang[idx]**2 + \
coeff[0, indvi[idx], i, 3]*sctang[idx]**3
idxdes = np.nonzero((ndvi >= ndvi_bnd1) & (ndvi < ndvi_bnd2) & (ndvi < des_ndvi))
y2[idxdes] = coeff[0, indvi[idxdes], i, 0] + \
coeff[0, indvi[idxdes], i, 1]*sctang[idxdes] + \
coeff[0, indvi[idxdes], i, 2]*sctang[idxdes]**2 + \
coeff[0, indvi[idxdes], i, 3]*sctang[idxdes]**3
thr[:, i] = (1.0 - x) + (x + y2)
thr_adj[:, i] = thr[:, i] * thr_adj_fac_desert
thr_adj[ndvi >= des_ndvi, i] = thr[ndvi >= des_ndvi, i] * thr_adj_fac_land
hicut = ((thr[:, 0] + thr_adj[:, 0])/100) # .reshape(data.ndvi.shape)
midpt = ((thr[:, 1] + thr_adj[:, 1])/100) # .reshape(data.ndvi.shape)
locut = ((thr[:, 2] + thr_adj[:, 2])/100) # .reshape(data.ndvi.shape)
idx = np.nonzero((ndvi >= fill_ndvi[0]) | (ndvi <= fill_ndvi[1]))
hicut[idx] = -999
midpt[idx] = -999
locut[idx] = -999
# out_thr = xr.DataArray(data=np.dstack((locut, midpt, hicut, np.ones(data.ndvi.shape),
# np.full(data.ndvi.shape, 2))),
# dims=('number_of_lines', 'number_of_pixels', 'z'))
#
# return out_thr
return locut, midpt, hicut
def vis_refl_thresholds(data, thresholds, scene):
locut, midpt, hicut = get_b1_thresholds(data, thresholds)
bias_adj = thresholds[scene]['Visible_Reflectance_Test']['adj']
ndvi = data.ndvi.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
m01 = data.M05.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
m02 = data.M07.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
m08 = data.M01.values.reshape(data.ndvi.shape[0]*data.ndvi.shape[1])
m128 = m01
b1_locut = locut * bias_adj
b1_midpt = midpt * bias_adj
b1_hicut = hicut * bias_adj
if ((scene == 'Land_Day_Desert') | (scene == 'Land_Day_Desert_Coast')):
ndvi_desert_thr = thresholds[scene]['Visible_Reflectance_Test']['ndvi_thr']
idx = np.nonzero(ndvi < ndvi_desert_thr)
b1_locut[idx] = locut[idx]
b1_midpt[idx] = midpt[idx]
b1_hicut[idx] = hicut[idx]
m128[idx] = m08[idx]
b1_power = np.full(b1_locut.shape, 2)
idx = np.nonzero(locut == -999)
b1_locut[idx] = thresholds[scene]['Visible_Reflectance_Test']['thr'][0]
b1_midpt[idx] = thresholds[scene]['Visible_Reflectance_Test']['thr'][1]
b1_hicut[idx] = thresholds[scene]['Visible_Reflectance_Test']['thr'][2]
b1_power[idx] = thresholds[scene]['Visible_Reflectance_Test']['thr'][3]
m128[idx] = m02[idx]
cosvza = np.cos(data.sensor_zenith.values * _dtr).reshape(ndvi.shape)
vzcpow = thresholds['VZA_correction']['vzcpow'][0]
b1_locut = (b1_locut * (1.0 / np.power(cosvza, vzcpow))).reshape(data.ndvi.shape)
b1_midpt = (b1_midpt * (1.0 / np.power(cosvza, vzcpow))).reshape(data.ndvi.shape)
b1_hicut = (b1_hicut * (1.0 / np.power(cosvza, vzcpow))).reshape(data.ndvi.shape)
out_thr = xr.DataArray(data=np.dstack((b1_locut, b1_midpt, b1_hicut, np.ones(data.ndvi.shape),
b1_power.reshape(data.ndvi.shape))),
dims=('number_of_lines', 'number_of_pixels', 'z'))
out_rad = xr.DataArray(data=m128.reshape(data.M01.shape), dims=('number_of_lines', 'number_of_pixels'))
return out_thr, out_rad
# NOTE: 11-12um Cirrus Test
# hicut is computed in different ways depending on the scene
# 1. midpt - adj
# - Land_Day
# - Land_Day_Coast
# - Land_Day_Desert
# - Land_Day_Desert_Coast
# - Ocean_Day
# - Ocean_Night
# - Polar_Day_Ocean
# - Polar_Night_Ocean
#
# 2. midpt - (btd_thr * adj)
# - Polar_Day_Land
# - Polar_Day_Coast
# - Polar_Day_Desert
# - Polar_Day_Desert_Coast
# - Polar_Day_Snow
#
# 3. Others
# - Land_Night
# - Polar_Night_Land
# - Polar_Night_Snow
# - Day_Snow
# - Night_Snow
# NOTE: 1.38um High Cloud Test
# thresholds are not always computed the same way. In group 1 there's no preprocessing required,
# in group 2 some calcuations are needed
# 1.
# - Land_Day
# - Land_Day_Coast
# - Land_Day_Desert
# - Land_Day_Desert_Coast
# - Polar_Day_Land
# - Polar_Day_Coast
# - Polar_Day_Desert
# - Polar_Day_Desert_Coast
# - Polar_Day_Snow
# - Day_Snow
#
# 2.
# - Ocean_Day
# - Polar_Ocean_Day