# -*- coding: utf-8 -*-
"""
The :mod:`quakemigrate.lut` module handles the definition and generation of the
traveltime lookup tables used in QuakeMigrate.
:copyright:
2020, QuakeMigrate developers.
:license:
GNU General Public License, Version 3
(https://www.gnu.org/licenses/gpl-3.0.html)
"""
import pyproj
from .create_lut import compute_traveltimes, read_nlloc # NOQA
from .lut import LUT # NOQA
# Handle bugged version of PROJ
proj_major, proj_minor, proj_patch = pyproj.proj_version_str.split(".")
if proj_major == "6" and proj_minor == "2":
raise ImportError(f"PROJ version {proj_major}.{proj_minor}.{proj_patch} is"
" being used as the backend for pyproj. This version "
"has a\nbug with the conversion of Z units when using "
"units that are not metres. Please consult the \n"
"QuakeMigrate installation instructions for how to "
"update the PROJ backend.")
[docs]def update_lut(old_lut_file, save_file):
"""
Utility function to convert old-style LUTs to new-style LUTs.
Parameters
----------
old_lut_file : str
Path to lookup table file to update.
save_file : str, optional
Output path for updated lookup table.
"""
from quakemigrate.io import read_lut
lut = read_lut(old_lut_file)
try:
traveltimes = {}
for station, phases in lut.maps.items():
for phase, ttimes in phases.items():
phase_code = phase.split("_")[1]
traveltimes.setdefault(station, {}).update(
{phase_code: ttimes})
lut.traveltimes = traveltimes
del lut.maps
except AttributeError:
pass
lut.phases = ["P", "S"]
lut.fraction_tt = 0.1
try:
lut.node_spacing = lut.cell_size
lut.node_count = lut.cell_count
del lut._cell_size, lut._cell_count
except AttributeError:
pass
lut.save(save_file)