DAS routines and modelling.
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import numpy as num
from scipy import signal
from .utils import traces_to_numpy_and_meta
def rad_to_de(traces, copy=False, m_per_rad=11.6e-9):
out_traces = []
for tr in traces:
assert "gauge_length" in tr.meta, "gauge_length not in metadata"
if copy:
tr = tr.copy()
tr.ydata *= m_per_rad
tr.ydata /= tr.meta["gauge_length"] * tr.deltat
tr.ydata /= 8192
tr.meta["unit"] = "strain rate (m/s/m)"
out_traces.append(tr)
def de_to_e(traces, detrend=True, copy=False):
out_traces = []
data, _ = traces_to_numpy_and_meta(traces)
# if detrend:
# signal.detrend(data, type='linear', axis=1, overwrite_data=True)
data = num.cumsum(data, axis=1)
for itr, tr in enumerate(traces):
if copy:
tr = tr.copy()
tr.set_ydata(data[itr])
tr.meta["unit"] = "strain (m/m)"
out_traces.append(tr)
return out_traces
def de_to_acceleration_static_slowness(traces, slowness, copy=False):
out_traces = []
for tr in traces:
if copy:
tr = tr.copy()
tr.set_ydata(tr.ydata / slowness)
tr.meta["unit"] = "acceleration (m/s^2)"
out_traces.append(tr)
return out_traces
def de_to_velocity_static_slowness(traces, slowness, copy=False):
out_traces = de_to_e(traces, copy)
for tr in out_traces:
tr.set_ydata(tr.ydata / slowness)
tr.meta["unit"] = "velocity (m/s)"
return out_traces
def de_to_relative_displacement(traces, copy=False):
traces = de_to_e(traces, copy)
data, meta = traces_to_numpy_and_meta(traces)
data = num.cumsum(data, axis=0) * meta.spatial_resolution
for itr, tr in enumerate(traces):
tr.set_ydata(data[itr])
tr.meta["unit"] = "displacement (m)"
return traces
def de_to_relative_velocity(traces, copy=False):
traces = de_to_e(traces, copy)
data, meta = traces_to_numpy_and_meta(traces)
data = num.diff(data, n=1, axis=0) / meta.spatial_resolution
for itr, tr in enumerate(traces):
tr.set_ydata(data[itr])
tr.meta["unit"] = "velocity (m/s)"
return traces