A friendly earthquake detector.
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import numpy as num
from pyrocko import orthodrome as od
from pyrocko.guts import Object, Float
class Point(Object):
lat = Float.T(default=0.0)
lon = Float.T(default=0.0)
x = Float.T(default=0.0)
y = Float.T(default=0.0)
z = Float.T(default=0.0)
@property
def vec(self):
return self.lat, self.lon, self.x, self.y, self.z
def points_coords(points, system=None):
a = num.zeros((len(points), 5))
for ir, r in enumerate(points):
a[ir, :] = r.vec
lats, lons, xs, ys, zs = a.T
if system is None:
return (lats, lons, xs, ys, zs)
elif system == 'latlon':
return od.ne_to_latlon(lats, lons, xs, ys)
elif system[0] == 'ne':
lat0, lon0 = system[1:3]
if num.all(lats == lat0) and num.all(lons == lon0):
return xs, ys
else:
elats, elons = od.ne_to_latlon(lats, lons, xs, ys)
return od.latlon_to_ne_numpy(lat0, lon0, elats, elons)
def point_coords(point, system=None):
coords = points_coords([point], system=system)
return [x[0] for x in coords]
def float_array_broadcast(*args):
return num.broadcast_arrays(*[
num.asarray(x, dtype=num.float) for x in args])
def surface_distance(alat, alon, anorth, aeast, blat, blon, bnorth, beast):
args = float_array_broadcast(
alat, alon, anorth, aeast, blat, blon, bnorth, beast)
want_scalar = False
if len(args[0].shape) == 0:
want_scalar = True
args = [num.atleast_1d(x) for x in args]
(alat, alon, anorth, aeast, blat, blon, bnorth, beast) = args
eqref = num.logical_and(alat == blat, alon == blon)
neqref = num.logical_not(eqref)
dist = num.empty_like(alat)
dist[eqref] = num.sqrt(
(bnorth[eqref] - anorth[eqref])**2 + (beast[eqref] - aeast[eqref])**2)
aalat, aalon = od.ne_to_latlon(
alat[neqref], alon[neqref], anorth[neqref], aeast[neqref])
bblat, bblon = od.ne_to_latlon(
blat[neqref], blon[neqref], bnorth[neqref], beast[neqref])
dist[neqref] = od.distance_accurate50m_numpy(aalat, aalon, bblat, bblon)
if want_scalar:
return dist[0]
else:
return dist
def bounding_box(lat, lon, north, east, depth, scale=1.0):
lat, lon, north, east, depth = float_array_broadcast(
lat, lon, north, east, depth)
if num.all(lat[0] == lat) and num.all(lon[0] == lon):
return _scaled_bb(
lat[0], lon[0],
(num.min(north), num.max(north)),
(num.min(east), num.max(east)),
(num.min(depth), num.max(depth)), scale)
else:
elat, elon = od.ne_to_latlon(lat, lon, north, east)
enorth, eeast = od.latlon_to_ne_numpy(elat[0], elon[0], elat, elon)
enorth_min = num.min(enorth)
enorth_max = num.max(enorth)
eeast_min = num.min(eeast)
eeast_max = num.max(eeast)
mnorth = 0.5*(enorth_min + enorth_max)
meast = 0.5*(eeast_min + eeast_max)
lat0, lon0 = od.ne_to_latlon(elat[0], elon[0], mnorth, meast)
return _scaled_bb(
lat0, lon0,
(enorth_min - mnorth, enorth_max - mnorth),
(eeast_min - meast, eeast_max - meast),
(num.min(depth), num.max(depth)),
scale)
def bounding_box_square(lat, lon, north, east, depth, scale=1.0):
lat, lon, (north_min, north_max), (east_min, east_max), \
(depth_min, depth_max) = bounding_box(lat, lon, north, east, depth)
dnorth = north_max - north_min
mnorth = 0.5 * (north_min + north_max)
deast = east_max - east_min
meast = 0.5 * (east_min + east_max)
dmax = max(dnorth, deast)
if dnorth < dmax:
north_min = mnorth - 0.5*dmax
north_max = mnorth + 0.5*dmax
if deast < dmax:
east_min = meast - 0.5*dmax
east_max = meast + 0.5*dmax
return _scaled_bb(
lat, lon,
(north_min, north_max),
(east_min, east_max),
(depth_min, depth_max),
scale)
def _scaled_range(ra, scale):
mi, ma = ra
d = ma - mi
m = 0.5 * (ma + mi)
return m - 0.5*scale*d, m + 0.5*scale*d
def _scaled_bb(lat, lon, north, east, depth, scale):
return (
lat, lon,
_scaled_range(north, scale),
_scaled_range(east, scale),
_scaled_range(depth, scale))