import logging
import numpy as num
from scipy import linalg as splinalg
from pyrocko import gf
from pyrocko.guts import String, Dict, List, Int
from pyrocko.guts_array import Array
from ..base import MisfitConfig, MisfitTarget, MisfitResult, TargetGroup
from grond.meta import has_get_plot_classes
guts_prefix = 'grond'
logger = logging.getLogger('grond.target').getChild('gnss_campaign')
[docs]
class GNSSCampaignMisfitResult(MisfitResult):
"""Carries the observations for a target and corresponding synthetics. """
statics_syn = Dict.T(
String.T(),
Array.T(dtype=num.float64, shape=(None,), serialize_as='list'),
optional=True,
help='Synthetic gnss surface displacements')
statics_obs = Array.T(
dtype=num.float64, shape=(None,), serialize_as='list',
optional=True,
help='Observed gnss surface displacements')
[docs]
class GNSSCampaignMisfitConfig(MisfitConfig):
pass
[docs]
class GNSSCampaignTargetGroup(TargetGroup):
"""Handles static displacements from campaign GNSS observations, e.g GPS.
Station information, displacements and measurement errors are provided in
a `yaml`-file (please find an example in the documentation). The
measurement errors may consider correlations between components of a
station, but correlations between single stations is not considered.
"""
gnss_campaigns = List.T(
optional=True,
help='List of individual campaign names'
' (`name` in `gnss.yaml` files).')
misfit_config = GNSSCampaignMisfitConfig.T()
def get_targets(self, ds, event, default_path='none'):
logger.debug('Selecting GNSS targets...')
targets = []
for camp in ds.get_gnss_campaigns():
if camp.name not in self.gnss_campaigns and\
'*all' not in self.gnss_campaigns:
continue
if not isinstance(self.misfit_config,
GNSSCampaignMisfitConfig):
raise AttributeError('misfit_config must be of type'
' GNSSCampaignMisfitConfig.')
lats = num.array([s.lat for s in camp.stations])
lons = num.array([s.lon for s in camp.stations])
north_shifts = num.array([s.north_shift for s in camp.stations])
east_shifts = num.array([s.east_shift for s in camp.stations])
gnss_target = GNSSCampaignMisfitTarget(
quantity='displacement',
campaign_name=camp.name,
lats=lats,
lons=lons,
east_shifts=east_shifts,
north_shifts=north_shifts,
ncomponents=camp.ncomponents,
tsnapshot=None,
interpolation=self.interpolation,
store_id=self.store_id,
normalisation_family=self.normalisation_family,
path=self.path or default_path,
misfit_config=self.misfit_config)
gnss_target.set_dataset(ds)
targets.append(gnss_target)
return targets
[docs]
@has_get_plot_classes
class GNSSCampaignMisfitTarget(gf.GNSSCampaignTarget, MisfitTarget):
"""Handles and carries out operations related to the objective functions.
The objective function is here the weighted misfit between observed
and predicted surface displacements.
"""
campaign_name = String.T()
ncomponents = Int.T(optional=True)
misfit_config = GNSSCampaignMisfitConfig.T()
can_bootstrap_weights = True
can_bootstrap_residuals = True
plot_misfits_cumulative = False
def __init__(self, **kwargs):
gf.GNSSCampaignTarget.__init__(self, **kwargs)
MisfitTarget.__init__(self, **kwargs)
self._obs_data = None
self._sigma = None
self._weights = None
self._correlated_weights = None
self._station_component_mask = None
@property
def id(self):
return self.campaign_name
def string_id(self):
return self.campaign_name
def misfits_string_ids(self):
id_list = []
for station in self.campaign.stations:
for name in ('north', 'east', 'up'):
component = station.__getattribute__(name)
if not component:
continue
id_list.append('%s.%s.%s' %
(self.path, station.code, name[0].upper()))
return id_list
@property
def station_names(self):
return ['%s' % (station.code)
for station in self.campaign.stations]
@property
def nmisfits(self):
if self.ncomponents is None:
try:
self.campaign.ncomponents
except ValueError:
raise ValueError('Set the dataset!')
return self.ncomponents
@property
def nstations(self):
return self.lats.size
def set_dataset(self, ds):
MisfitTarget.set_dataset(self, ds)
def get_correlated_weights(self, nthreads=0):
if self._correlated_weights is None:
self._correlated_weights = splinalg.sqrtm(self.weights)
return self._correlated_weights
@property
def campaign(self):
return self._ds.get_gnss_campaign(self.campaign_name)
@property
def obs_data(self):
if self._obs_data is None:
self._obs_data = num.concatenate(
[s.get_displacement_data() for s in self.campaign.stations])
return self._obs_data
@property
def obs_sigma(self):
if self._sigma is None:
self._sigma = num.array([
[s.north.sigma for s in self.campaign.stations],
[s.east.sigma for s in self.campaign.stations],
[s.up.sigma for s in self.campaign.stations]])\
.ravel(order='F')
return self._sigma
@property
def weights(self):
"""
Weights are the square-rooted, inverted data error variance-covariance.
The single component variances, and if provided the component
covariances, are used to build a data variance matrix or
variance-covariance matrix.
This matrix has the size for all possible NEU components,
but throws zeros for not given components, also recorded in
the _station_component_mask.
"""
if self._weights is None:
covar = self.campaign.get_covariance_matrix()
if not num.any(covar.diagonal()):
logger.warning('GNSS Stations have an empty covariance matrix.'
' Weights will be all equal.')
num.fill_diagonal(covar, 1.)
self._weights = num.asmatrix(covar).I
return self._weights
@property
def station_component_mask(self):
if self._station_component_mask is None:
self._station_component_mask = self.campaign.get_component_mask()
return self._station_component_mask
@property
def station_weights(self):
weights = num.diag(self.weights)
return num.mean([weights[0::3], weights[1::3], weights[2::3]], axis=0)
def component_weights(self):
ws = num.sum(self.weights, axis=0)
return ws
[docs]
def post_process(self, engine, source, statics):
"""Applies the objective function.
As a result the weighted misfits are given and the observed and
synthetic data.
"""
obs = self.obs_data
# All data is ordered in vectors as
# S1_n, S1_e, S1_u, ..., Sn_n, Sn_e, Sn_u. Hence (.ravel(order='F'))
syn = num.array([
statics['displacement.n'],
statics['displacement.e'],
-statics['displacement.d']])\
.ravel(order='F')
syn = syn[self.station_component_mask]
res = obs - syn
misfit_value = res
misfit_norm = obs
mf = num.vstack((misfit_value, misfit_norm)).T
result = GNSSCampaignMisfitResult(
misfits=mf)
if self._result_mode == 'full':
result.statics_syn = statics
result.statics_obs = obs
return result
[docs]
def get_combined_weight(self):
"""A given manual weight in the configuration is applied."""
if self._combined_weight is None:
self._combined_weight = num.full(self.nmisfits, self.manual_weight)
return self._combined_weight
def init_bootstrap_residuals(self, nbootstraps, rstate=None, nthreads=0):
logger.info('GNSS campaign %s, bootstrapping residuals'
' from measurement uncertainties ...'
% self.campaign.name)
if rstate is None:
rstate = num.random.RandomState()
campaign = self.campaign
bootstraps = num.empty((nbootstraps, self.ncomponents))
sigmas = num.diag(num.sqrt(campaign.get_covariance_matrix()))
if not num.all(sigmas):
logger.warning('Bootstrapping GNSS stations is meaningless,'
' all station\'s sigma are 0.0!')
for ibs in range(nbootstraps):
syn_noise = rstate.normal(scale=sigmas.ravel())
bootstraps[ibs, :] = syn_noise
self.set_bootstrap_residuals(bootstraps)
@classmethod
def get_plot_classes(cls):
from . import plot
plots = super(GNSSCampaignMisfitTarget, cls).get_plot_classes()
plots.extend(plot.get_plot_classes())
return plots
