Source code for openquake.hmtk.sources.source_conversion_utils

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vim: tabstop=4 shiftwidth=4 softtabstop=4
#
# LICENSE
#
# Copyright (c) 2010-2017, GEM Foundation, G. Weatherill, M. Pagani,
# D. Monelli.
#
# The Hazard Modeller's Toolkit is free software: you can redistribute
# it and/or modify it under the terms of the GNU Affero General Public
# License as published by the Free Software Foundation, either version
# 3 of the License, or (at your option) any later version.
#
# You should have received a copy of the GNU Affero General Public License
# along with OpenQuake. If not, see <http://www.gnu.org/licenses/>
#
# DISCLAIMER
#
# The software Hazard Modeller's Toolkit (openquake.hmtk) provided herein
# is released as a prototype implementation on behalf of
# scientists and engineers working within the GEM Foundation (Global
# Earthquake Model).
#
# It is distributed for the purpose of open collaboration and in the
# hope that it will be useful to the scientific, engineering, disaster
# risk and software design communities.
#
# The software is NOT distributed as part of GEM's OpenQuake suite
# (http://www.globalquakemodel.org/openquake) and must be considered as a
# separate entity. The software provided herein is designed and implemented
# by scientific staff. It is not developed to the design standards, nor
# subject to same level of critical review by professional software
# developers, as GEM's OpenQuake software suite.
#
# Feedback and contribution to the software is welcome, and can be
# directed to the hazard scientific staff of the GEM Model Facility
# (hazard@globalquakemodel.org).
#
# The Hazard Modeller's Toolkit (openquake.hmtk) is therefore distributed WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
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# The GEM Foundation, and the authors of the software, assume no
# liability for use of the software.

# -*- coding: utf-8 -*-
import abc
from decimal import Decimal
from openquake.hazardlib.pmf import PMF
from openquake.hazardlib.geo.nodalplane import NodalPlane
from openquake.hazardlib import mfd
from openquake.hazardlib.scalerel import get_available_scalerel
from openquake.hazardlib.scalerel.base import BaseMSR
from openquake.hazardlib.scalerel.wc1994 import WC1994

SCALE_RELS = get_available_scalerel()


def render_aspect_ratio(aspect_ratio, use_default=False):
    '''
    Returns the aspect ratio if one is defined for the source, otherwise
    if defaults are accepted a default value of 1.0 is returned or else
    a ValueError is raised

    :param float aspect_ratio:
        Ratio of along strike-length to down-dip width of the rupture

    :param bool use_default:
        If true, when aspect_ratio is undefined will return default value of
        1.0, otherwise will raise an error.
    '''
    if aspect_ratio:
        assert aspect_ratio > 0.
        return aspect_ratio
    else:
        if use_default:
            return 1.0
        else:
            raise ValueError('Rupture aspect ratio not defined!')

def mag_scale_rel_to_hazardlib(mag_scale_rel, use_default=False):
    """
    Returns the magnitude scaling relation in a format readable by
    openquake.hazardlib
    """
    if isinstance(mag_scale_rel, BaseMSR):
        return mag_scale_rel
    elif isinstance(mag_scale_rel, str):
        if not mag_scale_rel in SCALE_RELS.keys():
            raise ValueError('Magnitude scaling relation %s not supported!'
                             % mag_scale_rel)
        else:
            return SCALE_RELS[mag_scale_rel]()
    else:
        if use_default:
            # Returns the Wells and Coppersmith string
            return WC1994()
        else:
            raise ValueError('Magnitude Scaling Relation Not Defined!')

def npd_to_pmf(nodal_plane_dist, use_default=False):
    """
    Returns the nodal plane distribution as an instance of the PMF class
    """
    if isinstance(nodal_plane_dist, PMF):
        # Aready in PMF format - return
        return nodal_plane_dist
    else:
        if use_default:
            return PMF([(1.0, NodalPlane(0.0, 90.0, 0.0))])
        else:
            raise ValueError('Nodal Plane distribution not defined')

def hdd_to_pmf(hypo_depth_dist, use_default=False):
    """
    Returns the hypocentral depth distribtuion as an instance of the :class:
    openquake.hazardlib.pmf. 
    """
    if isinstance(hypo_depth_dist, PMF):
        # Is already instance of PMF
        return hypo_depth_dist
    else:
        if use_default:
            # Default value of 10 km accepted
            return PMF([(1.0, 10.0)])
        else:
            # Out of options - raise error!
            raise ValueError('Hypocentral depth distribution not defined!')

def simple_trace_to_wkt_linestring(trace):
    '''
    Coverts a simple fault trace to well-known text format

    :param trace:
        Fault trace as instance of :class: openquake.hazardlib.geo.line.Line

    :returns:
        Well-known text (WKT) Linstring representation of the trace
    '''
    trace_str = ""
    for point in trace:
        trace_str += ' %s %s,' % (point.longitude, point.latitude)
    trace_str = trace_str.lstrip(' ')
    return 'LINESTRING (' + trace_str.rstrip(',') + ')'

def simple_edge_to_wkt_linestring(edge):
    '''
    Coverts a simple fault trace to well-known text format

    :param trace:
        Fault trace as instance of :class: openquake.hazardlib.geo.line.Line

    :returns:
        Well-known text (WKT) Linstring representation of the trace
    '''
    trace_str = ""
    for point in edge:
        trace_str += ' %s %s %s,' % (point.longitude, point.latitude,
                                     point.depth)
    trace_str = trace_str.lstrip(' ')
    return 'LINESTRING (' + trace_str.rstrip(',') + ')'