def common_mode(self,
lref=[],
detrend_method='detrend_median',
method='median',
center=True,
verbose=True):
###################################################################
"""
calculates a common mode
:param lref: liste of site codes used to calculate the common mode
:param detrend_method: 'detrend_median' or 'detrend', method used to detrend the reference sites time series
:param method: method to calculate the common mode 'median' or 'mean'
:return: a Sgts instance with filtered time series. This new instance has a _CMM time series for the common mode
:note: time series are assumed to be daily time series
"""
# import
import pyacs.gts.lib.tensor_ts.sgts2obs_tensor
import pyacs.gts.lib.tensor_ts.obs_tensor2sgts
import numpy as np
from pyacs.gts.Gts import Gts
import pyacs.lib.astrotime as at
import pyacs.lib.coordinates as coor
# detrend for the reference sites
if detrend_method is not None:
dts = self.gts(detrend_method)
else:
dts = self.copy()
# creates an obs_tensor instance from the detrend time series
T_OBS_RAW, np_names_t_obs, np_obs_date_s = pyacs.gts.lib.tensor_ts.sgts2obs_tensor.sgts2tensor(
dts, rounding='day', verbose=verbose)
# center time series
if center:
T_OBS_RAW[:, :,
0] = T_OBS_RAW[:, :, 0] - np.nanmedian(T_OBS_RAW[:, :, 0],
axis=0)
T_OBS_RAW[:, :,
1] = T_OBS_RAW[:, :, 1] - np.nanmedian(T_OBS_RAW[:, :, 1],
axis=0)
T_OBS_RAW[:, :,
2] = T_OBS_RAW[:, :, 2] - np.nanmedian(T_OBS_RAW[:, :, 2],
axis=0)
# get the index of sites used for the common mode
lidx_code = []
for i in np.arange(np_names_t_obs.shape[0]):
if np_names_t_obs[i] in lref:
lidx_code.append(i)
np_idx_code = np.array(sorted(lidx_code))
# compute common mode
T_OBS_RAW_REF = T_OBS_RAW[:, np_idx_code, :]
if method == 'median':
CMM = np.nanmedian(T_OBS_RAW_REF, axis=1)
if method == 'mean':
CMM = np.nanmean(T_OBS_RAW_REF, axis=1)
# creates an obs_tensor instance from the original time series
T_OBS_RAW, np_names_t_obs, np_obs_date_s = pyacs.gts.lib.tensor_ts.sgts2obs_tensor.sgts2tensor(
self, rounding='day', verbose=verbose)
# remove common mode
T_OBS_RAW[:, :, 0] = T_OBS_RAW[:, :, 0] - CMM[:, 0].reshape(-1, 1)
T_OBS_RAW[:, :, 1] = T_OBS_RAW[:, :, 1] - CMM[:, 1].reshape(-1, 1)
T_OBS_RAW[:, :, 2] = T_OBS_RAW[:, :, 2] - CMM[:, 2].reshape(-1, 1)
# dispersion of the common mode
# TBD
# converts obs_tensor object to Sgts
filtered_sgts = pyacs.gts.lib.tensor_ts.obs_tensor2sgts.obs_tensor2sgts(
T_OBS_RAW, np_names_t_obs, np_obs_date_s, verbose=verbose)
# adds the common mode time series
cmm_ts = Gts(code='_CMM')
# get index where values are Nan
lindex = np.where(np.isfinite(CMM[:, 0]))[0]
data = np.zeros((lindex.shape[0], 10))
# obs_tensor is ENU and Gts are NEU
data[:, 2] = CMM[lindex, 0] * 1E-3
data[:, 1] = CMM[lindex, 1] * 1E-3
data[:, 3] = CMM[lindex, 2] * 1E-3
# set std as 1 mm to avoid singularity
data[:, 4] = 1E-3
data[:, 5] = 1E-3
data[:, 6] = 1E-3
data[:,
0] = at.datetime2decyear(at.seconds2datetime(np_obs_date_s[lindex]))
# populate X0, Y0, Z0, lon, lat, he
X_cmm = 0
Y_cmm = 0
Z_cmm = 0
for code in filtered_sgts.lcode():
filtered_sgts.__dict__[code].X0 = self.__dict__[code].X0
filtered_sgts.__dict__[code].Y0 = self.__dict__[code].Y0
filtered_sgts.__dict__[code].Z0 = self.__dict__[code].Z0
filtered_sgts.__dict__[code].lon = self.__dict__[code].lon
filtered_sgts.__dict__[code].lat = self.__dict__[code].lat
filtered_sgts.__dict__[code].h = self.__dict__[code].h
X_cmm = X_cmm + self.__dict__[code].X0
Y_cmm = Y_cmm + self.__dict__[code].Y0
Z_cmm = Z_cmm + self.__dict__[code].Z0
cmm_ts.data = data
X_cmm = X_cmm / len(filtered_sgts.lcode())
Y_cmm = Y_cmm / len(filtered_sgts.lcode())
Z_cmm = Z_cmm / len(filtered_sgts.lcode())
cmm_ts.X0 = X_cmm / len(filtered_sgts.lcode())
cmm_ts.Y0 = Y_cmm / len(filtered_sgts.lcode())
cmm_ts.Z0 = Z_cmm / len(filtered_sgts.lcode())
(cmm_ts.lon, cmm_ts.lat, cmm_ts.h) = coor.xyz2geo(cmm_ts.X0,
cmm_ts.Y0,
cmm_ts.Z0,
unit='dec_deg')
filtered_sgts.append(cmm_ts)
return filtered_sgts
nps = InSAR.shape[0]
#nps = 10
RESULTS = np.zeros((nps,14))
# fills longitudes and latitudes
RESULTS[:,0] = InSAR[:nps,0]
RESULTS[:,1] = InSAR[:nps,1]
for i in np.arange(nps):
print("-- # %05d / %05d %03d %%" % (i,nps,int(i/nps*100.)) )
# initialize a ts
ts=Gts()
ts.data = np.zeros( (np_dec_year.shape[0],10) )
ts.data[:,0] = np_dec_year
ts.data[:,1] = InSAR[i,2:20]
ts.data[:,2] = InSAR[i,2:20]
ts.data[:,3] = InSAR[i,2:20]
ts.data[:,4] = 1.
ts.data[:,5] = 1.
ts.data[:,6] = 1.
# Full ts L2 norm
dts = ts.detrend()
vel = dts.velocity
wrms = dts.wrms()
RESULTS[i,2] = vel[0]
RESULTS[i,3] = wrms[0]
