class GeodSharedMemoryBugTestIssue64(unittest.TestCase):
def setUp(self):
self.g = Geod(ellps='clrk66')
self.ga = self.g.a
self.mercury = Geod(a=2439700) # Mercury 2000 ellipsoid
# Mercury is much smaller than earth.
def test_not_shared_memory(self):
self.assertEqual(self.ga, self.g.a)
# mecury must have a different major axis from earth
self.assertNotEqual(self.g.a, self.mercury.a)
self.assertNotEqual(self.g.b, self.mercury.b)
self.assertNotEqual(self.g.sphere, self.mercury.sphere)
self.assertNotEqual(self.g.f, self.mercury.f)
self.assertNotEqual(self.g.es, self.mercury.es)
# initstrings were not shared in issue #64
self.assertNotEqual(self.g.initstring, self.mercury.initstring)
def test_distances(self):
# note calculated distance was not an issue with #64, but it still a shared memory test
boston_lat = 42.+(15./60.); boston_lon = -71.-(7./60.)
portland_lat = 45.+(31./60.); portland_lon = -123.-(41./60.)
az12,az21,dist_g = self.g.inv(boston_lon,boston_lat,portland_lon,portland_lat)
az12,az21,dist_mercury = self.mercury.inv(boston_lon,boston_lat,portland_lon,portland_lat)
self.assertLess(dist_mercury, dist_g)
def getAzimuth(self, point):
"""
Get azimuth (in degrees) between current point and provided point (point).
"""
g = Geod(ellps="sphere")
forward_azimuth, back_azimuth, distance = g.inv(self.longitude, self.latitude, point.longitude, point.latitude)
return forward_azimuth
def compute_lagdistances(sta,stnum,lon,lat):
'''
Compute the lag distances between all stations in the given set
Input:
sta: Array with strings of station names (n x 1)
stnum: Array with unique station numbers (n x 1)
lon: Array with station longitudes (n x 1)
lat: Array with station latitudes (n x 1)
Output:
lagdistance: Upper triangular matrix with lag distances for all station pairs (n x n)
'''
from pyproj import Geod
import numpy as np
# Make projection:
p = Geod(ellps='WGS84')
# Make lag matrix:
lagdistance_full = np.zeros((len(stnum),len(stnum)))
## Start to fill in lag matrix
# Loop over all stations, make a matrix with the lon and lat of just that station, and compute the distance to all other stations (lon,lat):
for stationi in range(len(stnum)):
azimuthi,backazimuthi,distancei = p.inv(lon[stationi]*np.ones(len(stnum)),lat[stationi]*np.ones(len(stnum)), lon, lat)
# Fill the matrix with these distances for this station:
lagdistance_full[stationi,:] = distancei/1000
# Turn it into an upper triangular matrix:
lagdistance = np.triu(lagdistance_full)
# Return lag distance:
return lagdistance
def c1ompare_points_old(a, b, dx, proj='LongLat'):
if isinstance(dx, float):
dx = [dx, dx]
tolerance = [0.6 * x for x in dx]
if (proj == 'horizontal'):
pa = project(a, projection_type='proj_cartesian')
pb = project(b, projection_type='proj_cartesian')
#print tolerance, pa, pb
if ( not (abs(pa[1] - pb[1]) < tolerance[1]) ):
return False
elif (abs(pa[0] - pb[0]) < tolerance[0]):
return True
else:
return False
else:
from pyproj import Geod
wgs84_geod = Geod(ellps='WGS84')
az12,az21,dist = wgs84_geod.inv(a[0],a[1],a[0],a[1])
return dist < tolerance[0] * 1e5
if ( not (abs(a[1] - b[1]) < tolerance[1]) ):
#AddComment('lat differ')
return False
elif (abs(a[0] - b[0]) < tolerance[0]):
#AddComment('long same')
return True
elif ((abs(abs(a[0]) - 180) < tolerance[0]) and (abs(abs(b[0]) - 180) < tolerance[0])):
#AddComment('long +/-180')
return True
else:
#AddComment('not same %g %g' % (abs(abs(a[0]) - 180), abs(abs(b[0]) - 180) ) )
return False
def find_closest_soundings(l1b_file, tgt_latitude, tgt_longitude, max_distance, log_output=sys.stdout):
l1b_obj = acos_file.L1B(l1b_file)
sounding_ids = l1b_obj.get_sounding_ids()
# Average over band first since this is likely to be consistent for
# different types of L1B files
latitudes = l1b_obj.get_sounding_info('sounding_latitude')
longitudes = l1b_obj.get_sounding_info('sounding_longitude')
# Average over any non sounding id sized dimensions
while len(latitudes.shape) > 1:
extra_dims = numpy.where(numpy.array(latitudes.shape) != sounding_ids.shape[0])
latitudes = numpy.average(latitudes, extra_dims[0][0])
longitudes = numpy.average(longitudes, extra_dims[0][0])
g = Geod(ellps='WGS84')
# Find all distances in file
distances = numpy.zeros(len(sounding_ids), dtype=float)
for dist_idx, lat_lon_tuple in enumerate(zip(latitudes, longitudes)):
curr_lat, curr_lon = lat_lon_tuple
az12, az21, dist = g.inv(tgt_longitude,tgt_latitude,curr_lon,curr_lat)
# Convert to km
distances[dist_idx] = dist/1000.
closest = numpy.where(distances <= max_distance)
if len(closest[0]) > 0:
print >>log_output, "%s" % l1b_file
for close_idx in closest[0]:
print >>log_output, '%d %f' % (sounding_ids[close_idx], distances[close_idx])
print >>log_output, ""
else:
print >>sys.stderr, "No soundings found in %s closer than %f km" % (l1b_file, max_distance)
def grcrcl1(lon_1, lat_1, lon_2, lat_2):
g = Geod(ellps='WGS84')
az, az_inv, dist = g.inv(lon_1, lat_1, lon_2, lat_2)
return dist
def gdlComp(self, lons_lats, km_pts=20):
"""
Compute geodesic line
lons_lats: input coordinates.
(start longitude, start latitude, end longitude, end latitude)
km_pts: compute one point each 20 km (default).
"""
try:
lon_1, lat_1, lon_2, lat_2 = lons_lats
pygd = Geod(ellps='WGS84')
res = pygd.inv(lon_1, lat_1, lon_2, lat_2)
dist = res[2]
pts = int(math.ceil(dist) / (km_pts * 1000))
coords = pygd.npts(lon_1, lat_1, lon_2, lat_2, pts)
coords_se = [(lon_1, lat_1)] + coords
coords_se.append((lon_2, lat_2))
self.__logger.info("Geodesic line succesfully created!")
self.__logger.info("Total points = {:,}".format(pts))
self.__logger.info("{:,.4f} km".format(dist / 1000.))
return coords_se
except Exception as e:
self.__logger.error("Error: {0}".format(e.message))
def __init__(self, srs, bbox, width=None, height=None, format=None, resource_id=None): super(WmsQuery, self).__init__() self.query_type = 'WMS' self.srs = srs self.bbox = bbox self.width = width self.height = height self.format = format self.resource_id = resource_id if width is not None and height is not None: # calculate resolution... this should slow things down, yay... :-( p = Proj(init=srs.lower()) if not p.is_latlong(): min_lon, min_lat = p(bbox.min_x,bbox.min_y, inverse=True) max_lon, max_lat = p(bbox.max_x,bbox.max_y, inverse=True) else: min_lon, min_lat = bbox.min_x, bbox.min_y max_lon, max_lat = bbox.max_x, bbox.max_y g = Geod(ellps='clrk66') # Use Clarke 1966 ellipsoid. _,_,diagonal = g.inv(min_lon, min_lat, max_lon, max_lat) # distance calculated geodesic dist_x = sqrt(diagonal**2 / (1 + float(height)/float(width)) ) dist_y = dist_x * (float(height)/float(width)) self.x_res = dist_x / float(width) self.y_res = dist_y / float(height) else: self.x_res = None self.y_res = None
def distance_matrix(pts, lon='lon', lat='lat', ellps='WGS84'):
"""
Calculate distance between all points
Parameters
----------
pts: pandas.DataFrame
Table of points with at least the collumns given by ``lon`` and ``lat``
lon, lat: str, optional
Column names for the longitude and latitude fields. Defaults are
'lon' and 'lat'.
ellps: str, optional
Name of the ellipsoid. See :class:`pyproj.Geod` for valid names.
Returns
-------
distances: numpy.ndarray
len(pts) x len(pts) array of distances between all points in ``pts``.
"""
gd = Geod(ellps=ellps)
npts = len(pts)
G = np.zeros((npts, npts))
for i in range(npts):
for j in range(npts):
_, _, G[i][j] = gd.inv(pts.ix[i][lon], pts.ix[i][lat],
pts.ix[j][lon], pts.ix[j][lat])
return G
def midpoint_longest(north_lat, west_lon, south_lat, east_lon):
g = Geod(ellps='WGS84')
af, ab, dist = g.inv(west_lon, north_lat, east_lon, south_lat)
rlon, rlat, az = g.fwd(west_lon, north_lat, af, dist/2)
rlon += 180 if rlon < 0 else -180
rlon = round(rlon, 6)
rlat = round(rlat, 6)
return rlat, rlon
def build_great_circle(self, start_latlng, end_latlng, distance):
num_points = int(distance / self.ARC_LENGTH_SPACING)
geod = Geod(ellps='WGS84')
start_lat, start_lon = start_latlng
end_lat, end_lon = end_latlng
lonlats = geod.npts(start_lon, start_lat, end_lon, end_lat, num_points)
latlngs = util.swap_pairs(lonlats)
return latlngs
def addLengthMeters(self, stream_network):
"""
Adds length field in meters to network (The added field name will be 'LENGTH_M').
.. note:: This may be needed for generating the kfac file depending on the units of your raster. See: :doc:`gis_tools`.
Parameters:
stream_network(str): Path to stream network file.
Here is an example of how to use this:
.. code:: python
import os
from RAPIDpy.gis.taudem import TauDEM
td = TauDEM()
output_directory = '/path/to/output/files'
td.addLengthMeters(os.path.join(output_directory,"stream_reach_file.shp"))
"""
network_shapefile = ogr.Open(stream_network, 1)
network_layer = network_shapefile.GetLayer()
network_layer_defn = network_layer.GetLayerDefn()
#make sure projection EPSG:4326
network_layer_proj = network_layer.GetSpatialRef()
geographic_proj = osr.SpatialReference()
geographic_proj.ImportFromEPSG(4326)
proj_transform = None
if network_layer_proj != geographic_proj:
proj_transform = osr.CoordinateTransformation(network_layer_proj, geographic_proj)
#check for field
create_field=True
for i in xrange(network_layer_defn.GetFieldCount()):
field_name = network_layer_defn.GetFieldDefn(i).GetName()
if field_name == 'LENGTH_M':
create_field=False
break
if create_field:
network_layer.CreateField(ogr.FieldDefn('LENGTH_M', ogr.OFTReal))
geo_manager = Geod(ellps="WGS84")
for network_feature in network_layer:
feat_geom = network_feature.GetGeometryRef()
#make sure coordinates are geographic
if proj_transform:
feat_geom.Transform(proj_transform)
line = shapely_loads(feat_geom.ExportToWkb())
lon_list, lat_list = line.xy
az1, az2, dist = geo_manager.inv(lon_list[:-1], lat_list[:-1], lon_list[1:], lat_list[1:])
network_feature.SetField('LENGTH_M', sum(dist))
network_layer.SetFeature(network_feature)
def getHorizontalDistance(self, point):
"""
Get horizontal distance (great circle distance, in km) between current point
and provided point (point).
"""
g = Geod(ellps="sphere")
forward_azimuth, back_azimuth, horizontal_distance = g.inv(
self.longitude, self.latitude, point.longitude, point.latitude
)
return horizontal_distance * 1e-3 # 1e-3 is needed to convert from m to km
def _distance(self, start, to):
'''
Return distance.
'''
q = Geod(ellps='WGS84')
fa, ba, d =\
q.inv(start['lon'],
start['lat'],
to['lon'],
to['lat'])
return d
def lat_lon_grid_deltas(longitude, latitude, **kwargs):
r"""Calculate the delta between grid points that are in a latitude/longitude format.
Calculate the signed delta distance between grid points when the grid spacing is defined by
delta lat/lon rather than delta x/y
Parameters
----------
longitude : array_like
array of longitudes defining the grid
latitude : array_like
array of latitudes defining the grid
kwargs
Other keyword arguments to pass to :class:`~pyproj.Geod`
Returns
-------
dx, dy:
at least two dimensional arrays of signed deltas between grid points in the x and y
direction
Notes
-----
Accepts 1D, 2D, or higher arrays for latitude and longitude
Assumes [..., Y, X] for >=2 dimensional arrays
"""
from pyproj import Geod
# Inputs must be the same number of dimensions
if latitude.ndim != longitude.ndim:
raise ValueError('Latitude and longitude must have the same number of dimensions.')
# If we were given 1D arrays, make a mesh grid
if latitude.ndim < 2:
longitude, latitude = np.meshgrid(longitude, latitude)
geod_args = {'ellps': 'sphere'}
if kwargs:
geod_args = kwargs
g = Geod(**geod_args)
forward_az, _, dy = g.inv(longitude[..., :-1, :], latitude[..., :-1, :],
longitude[..., 1:, :], latitude[..., 1:, :])
dy[(forward_az < -90.) | (forward_az > 90.)] *= -1
forward_az, _, dx = g.inv(longitude[..., :, :-1], latitude[..., :, :-1],
longitude[..., :, 1:], latitude[..., :, 1:])
dx[(forward_az < 0.) | (forward_az > 180.)] *= -1
return dx * units.meter, dy * units.meter
def cell_height(self):
cell_height = np.full(self.shape, np.nan)
geod = Geod(ellps='WGS84')
for i in range(self.shape[0]):
_az12, _az21, cell_length = geod.inv(
self.longitude[i, 0],
self.latitude[i, 0] + .25,
self.longitude[i, 0],
self.latitude[i, 0] - .25,
)
cell_height[i, :] = cell_length
return cell_height
def getPoint(self, horizontal_distance, vertical_distance, azimuth):
"""
Get point with given horizontal, and vertical distances (in km,
vertical distance: positive-downward, negative-upward)
and azimuth (in degrees) from current point.
"""
# TODO: check horizontal distance is positive
g = Geod(ellps="sphere")
longitude, latitude, back_azimuth = g.fwd(
self.longitude, self.latitude, azimuth, horizontal_distance * 1e3
) # 1e3 is needed to convert from km to m
depth = self.depth + vertical_distance
return Point(longitude, latitude, depth)
def build_bins(pts, spacing=6.25, width=50, runin=0,
isequence0=1000, ellps='WGS84'):
"""
Build bins along a line of points.
"""
gd = Geod(ellps=ellps)
div_pts = divide_line(pts, spacing=spacing,
runin=runin, ellps=ellps)
bins = []
ndiv = len(div_pts)
ibin = isequence0
align_to_last_bin = False
for i in range(0, ndiv - 1):
lon0, lat0, x0, i0 = div_pts[i]
lon1, lat1, x1, i1 = div_pts[i + 1]
faz, baz, dist = gd.inv(lon0, lat0, lon1, lat1)
# bin corners
_bin = _build_bin(lon0, lat0, lon1, lat1, width, gd)
# bin center
_center = _calculate_center(_bin)
# put it all together
bins.append([ibin, None, _center, _bin])
# handle bends in the line
if align_to_last_bin:
# align bins
bins[-1][3][0] = bins[-2][3][1]
bins[-1][3][3] = bins[-2][3][2]
# recalculate center and offset
bins[-1][2] = _calculate_center(bins[-1][3])
align_to_last_bin = False
if i0 == i1:
ibin -= 1
i += 1
_bin = bins[-1]
del bins[-1]
align_to_last_bin = True
# distance on line and line azimuth
if i == 0:
bins[-1][1] = div_pts[0][2]
bins[-1] += [None]
else:
az, _, dx = gd.inv(bins[-1][2][0], bins[-1][2][1],
bins[-2][2][0], bins[-2][2][1])
bins[-1][1] = bins[-2][1] + dx
bins[-1] += [az]
# increment bin number
ibin += 1
# assume first azimuth is the same as 2nd azimuth
bins[0][4] = [bins[1][4]]
return bins
def size (self):
from pyproj import Geod
g = Geod(ellps='WGS84')
lon_min = self.lonw
lon_max = self.lone
lat_min = self.lats
lat_max = self.latn
lon = (lon_min+lon_max)/2
lat = (lat_min+lat_max)/2
sn = g.inv (lon, lat_min, lon, lat_max, radians=False)[2]
we = g.inv (lon_min, lat, lon_max, lat, radians=False)[2]
return (sn, we)
def midpoint_utm(self,p1,p2):
"""
calculates midpoint between 2 points on earths surface
input: p1,p2 location in the form (lon,lat)
return: m midpoint in the form (lon,lat)
"""
g = Geod(ellps='WGS84')
l = g.npts(p1[0],p1[0],p1[1],p1[1],1)
m = l[0]
# print 'm: ', m
return m
def divide_line(pts, spacing=6.25, runin=0.,
ellps='WGS84', isegment0=0):
"""
Divide a line into equally spaced segments.
Parameters
----------
pts : list of tuples
List of point coordinates in longitude and latitude that define the
line. Format is: ``[(lon_0, lat_0), (lon_1, lat_1), ...,
(lon_n, lat_n)]``.
spacing : float, optional
Spacing between line segments in meters.
runin : float, optional
Length of a "run-in" segment prepended to the line.
ellps : str, optional
Name of the ellipse to use in geodetic calculations. Must be
recognized by :class:`pyproj.Geod`.
isegment0 : int, optional
Sequence number of the first bin.
Returns
-------
bins : list
List of (lon, lat, offset, sequence) tuples.
"""
gd = Geod(ellps=ellps)
x = -runin
_x = -runin
ibin = isegment0
bins = []
for i in range(0, len(pts) - 1):
_x0 = _x
lon0, lat0 = pts[i]
lon1, lat1 = pts[i + 1]
faz, baz, dist = gd.inv(lon0, lat0, lon1, lat1)
while _x <= dist:
lon, lat, _ = gd.fwd(lon0, lat0, faz, _x)
bins += [(lon, lat, x, ibin)]
_x += spacing
x += spacing
ibin += 1
_x -= dist
x -= _x
if _x > 0:
x += _x
bins += [(lon1, lat1, x, ibin - 1)]
return bins
def zero_padding(self, outfname, component, evlo, evla, dt, minV=1.5, iter0=None, iterf=None, diter=None, verbose=True):
# - Some initialisations. ------------------------------------------------------------------
g = Geod(ellps='WGS84')
dset = h5py.File(outfname)
dset.attrs.create(name = 'theta_max', data=self.attrs["theta_max"], dtype='f')
dset.attrs.create(name = 'theta_min', data=self.attrs["theta_min"], dtype='f')
dset.attrs.create(name = 'phi_min', data=self.attrs["phi_min"], dtype='f')
dset.attrs.create(name = 'phi_max', data=self.attrs["phi_max"], dtype='f')
lat_min = 90.0 - self.attrs["theta_max"]*180.0/np.pi
lat_max = 90.0 - self.attrs["theta_min"]*180.0/np.pi
lon_min = self.attrs["phi_min"]*180.0/np.pi
lon_max = self.attrs["phi_max"]*180.0/np.pi
dset.attrs.create(name = 'lat_min', data=lat_min, dtype='f')
dset.attrs.create(name = 'lat_max', data=lat_max, dtype='f')
dset.attrs.create(name = 'lon_min', data=lon_min, dtype='f')
dset.attrs.create(name = 'lon_max', data=lon_max, dtype='f')
dset.attrs.create(name = 'depth', data=self.attrs['depth'], dtype='f')
dset.attrs.create(name = 'n_procs', data=self.attrs['n_procs'], dtype='f')
dset.attrs.create(name = 'rotation_axis', data=self.attrs['rotation_axis'], dtype='f')
dset.attrs.create(name = 'rotation_angle', data=self.attrs['rotation_angle'], dtype='f')
group = dset.create_group( name = component )
in_group= self[component]
# - Loop over processor boxes and check if depth falls within the volume. ------------------
try: iterArr=np.arange(iter0 ,iterf+diter, diter, dtype=int)
except: iterArr = in_group.keys()
for iteration in iterArr:
try: in_subgroup = in_group[str(iteration)]
except KeyError: continue
subgroup=group.create_group(name=str(iteration))
if verbose: print 'Zero padding snapshot for iteration =',iteration
time = float(iteration) * dt; mindist = time * minV
for iproc in in_subgroup.keys():
in_subdset = in_subgroup[iproc]
field = in_subdset.value
theta = in_subdset.attrs['theta']
phi = in_subdset.attrs['phi']
lat = 90.-theta/np.pi*180.; lon = phi/np.pi*180.
lats, lons = np.meshgrid(lat, lon, indexing = 'ij')
evlaArr = evla * np.ones(lats.shape); evloArr = evlo * np.ones(lats.shape)
az, baz, distevent = g.inv(lons, lats, evloArr, evlaArr)
distevent=distevent/1000.
index_padding = distevent < mindist
field[index_padding] = 0
subdset = subgroup.create_dataset(name=iproc, shape=field.shape, data=field)
subdset.attrs.create(name = 'theta', data=theta, dtype='f')
subdset.attrs.create(name = 'phi', data=phi, dtype='f')
dset.close()
return
def calculate_distances(d):
g = Geod(ellps='WGS84')
far_left_lat = d['elevation_latlon_list'][0][0]
far_left_lon = d['elevation_latlon_list'][1][0]
for i, v in d['twod_vertices'].iteritems():
pt_lat = v[0]
pt_lon = v[1]
az1, az2, dist = g.inv(far_left_lon, far_left_lat, pt_lon, pt_lat)
km_dist = dist / 1000.0
d['twod_vertices'][i] = [v[0], v[1], v[2], km_dist]
d['gps_dist'] = []
for pt_lat, pt_lon in zip(d['gps_lat'], d['gps_lon']):
az1, az2, dist = g.inv(far_left_lon, far_left_lat, pt_lon, pt_lat)
km_dist = dist / 1000.0
d['gps_dist'].append(km_dist)
def __init__(self, width=800,
height=None, bgcol=DEFAULT_BG, proj='eqc',
cols=DEFAULT_COLS, line_width=1, gc_resolution=100):
'''
Create an object for turning coordinate pairs into an image.
Parameters
height the height of the resultant image
width the width of the resultant image
bgcol the background color of the image,
as an (r,g,b) triple
proj the projection name as a string (passed to
pyproj)
cols a function which takes one fractional
argument and returns a color (r,g,b) triple
line_width the width of lines drawn
gc_resolution the number of straight line segments
used to approximate each great-circle
curve
Once the object is initialized, call set_data to add data.
'''
if height is None:
height = width / 2
self.height = height
self.width = width
self.bgcol = bgcol
self.proj = proj
self.line_width = line_width
self.gc_resolution = gc_resolution
self.cols = cols
self.geo = Geod(a=1)
class MeetingPlaceAroundGeo(object):
def __init__(self, debug=2):
self._debug = debug
self._dist_obj = Distance()
self._geod = Geod(ellps='WGS84')
############################################################
# POI-DB
############################################################
opdb = OSM_POIDb()
for f in [ "bar.sfbayarea.xml", "restaurant.sfbayarea.xml", "cafe.sfbayarea.xml" ]:
opdb.make_fromOSMXml(os.path.join("osm_data_xml", f))
self._opdb = opdb
def get_lon_lat_box(self, lon, lat, radius=10, in_miles=False):
distance_in_metres = radius*1000
if in_miles: distance_in_metres = distance_in_metres*1.60934
nesw_ll = self._geod.fwd([lon]*4, [lat]*4, [0,90,180,270], [distance_in_metres]*4)
### print nesw_ll
return ( (min(nesw_ll[0]), max(nesw_ll[0])), (min(nesw_ll[1]), max(nesw_ll[1])) )
def get_amenities_around_city(self, city, country='us', region=None, radius=10, in_miles=False):
bb_arr = self._dist_obj.get_city_lon_lat(city, country, region)
### print dll_arr
xbb_arr = [ self.get_lon_lat_box(t[0], t[1], radius, in_miles) for t in bb_arr]
#
#
for bb in xbb_arr:
if self._debug >= 2: print "Bounding box: ", bb
a = self._opdb.get_pois_in_lon_lat_box(bb[0][0], bb[1][0], bb[0][1], bb[1][1])
yield a
def okada_synthetics(strike,dip,rake,length,width,lon_source,lat_source,
depth_source,lon_obs,lat_obs,mu):
'''
Calculate neu synthetics for a subfault using Okada analytical solutions
'''
from okada_wrapper import dc3dwrapper
from numpy import array,cos,sin,deg2rad,zeros
from pyproj import Geod
theta=strike-90
theta=deg2rad(theta)
#Rotaion matrices since okada_wrapper is only for east striking fault
R=array([[cos(theta),-sin(theta)],[sin(theta),cos(theta)]])
R2=array([[cos(-theta),-sin(-theta)],[sin(-theta),cos(-theta)]])
#position of point from lon/lat to x/y assuming subfault center is origin
P=Geod(ellps='WGS84')
az,baz,dist=P.inv(lon_source,lat_source,lon_obs,lat_obs)
dist=dist/1000.
x_obs=dist*sin(deg2rad(az))
y_obs=dist*cos(deg2rad(az))
#Calculate on rotated position
xy=R.dot(array([x_obs, y_obs]))
#Get Okada displacements
lamb=mu
alpha = (lamb + mu) / (lamb + 2 * mu)
ss_in_m=1.0*cos(deg2rad(rake))
ds_in_m=1.0*sin(deg2rad(rake))
success, u, grad_u = dc3dwrapper(alpha, [xy[0], xy[1], 0.0],depth_source,dip,
[-length/2., length/2.], [-width/2., width/2],
[ss_in_m, ds_in_m, 0.0])
#Rotate output
urot=R2.dot(array([[u[0]], [u[1]]]))
u[0]=urot[0]
u[1]=urot[1]
#output
n=u[1]
e=u[0]
z=u[2]
return n,e,z
def okada_synthetics(strike,dip,rake,length,width,lon_source,lat_source,
depth_source,lon_obs,lat_obs,mu):
'''
Calculate neu synthetics for a subfault using Okada analytical solutions
'''
from okada_wrapper import dc3dwrapper
from numpy import array,cos,sin,deg2rad,zeros
from pyproj import Geod
theta=strike-90
theta=deg2rad(theta)
#Rotaion matrices since okada_wrapper is only for east striking fault
R=array([[cos(theta),-sin(theta)],[sin(theta),cos(theta)]])
R2=array([[cos(-theta),-sin(-theta)],[sin(-theta),cos(-theta)]])
#position of point from lon/lat to x/y assuming subfault center is origin
P=Geod(ellps='WGS84')
az,baz,dist=P.inv(lon_source,lat_source,lon_obs,lat_obs)
dist=dist/1000.
x_obs=dist*sin(deg2rad(az))
y_obs=dist*cos(deg2rad(az))
#Calculate on rotated position
xy=R.dot(array([x_obs, y_obs]))
#Get Okada displacements
lamb=mu
alpha = (lamb + mu) / (lamb + 2 * mu)
ss_in_m=1.0*cos(deg2rad(rake))
ds_in_m=1.0*sin(deg2rad(rake))
success, u, grad_u = dc3dwrapper(alpha, [xy[0], xy[1], 0.0],depth_source,dip,
[-length/2., length/2.], [-width/2., width/2],
[ss_in_m, ds_in_m, 0.0])
#Rotate output
urot=R2.dot(array([[u[0]], [u[1]]]))
u[0]=urot[0]
u[1]=urot[1]
#output
n=u[1]
e=u[0]
z=u[2]
return n,e,z
def get_stats(self, start_date=None, end_date=None):
link_time = 0
move_time = 0
stay_time = 0
distance = 0
qs = self.positions.all()
if start_date:
qs = qs.filter(date__gte=start_date)
if end_date:
qs = qs.filter(date__lte=end_date)
prev_p = None
from pyproj import Geod
g = Geod(ellps='clrk66')
for p in qs:
if not prev_p:
prev_p = p
continue
time_delta = (p.date - prev_p.date).seconds
if time_delta == 0:
prev_p = p
continue
if time_delta < settings.MIN_LINK_TIMEOUT:
link_time += time_delta
try:
angle, angle2, dist = g.inv(prev_p.point.x, prev_p.point.y,
p.point.x, p.point.y)
except ValueError: # except for 'may be' antipodal points
continue
if p.speed == None:
avg_speed = float(dist) / float(time_delta)
avg_speed = avg_speed * 10 / 36.
if avg_speed < settings.STAY_AVG_SPEED:
stay_time += time_delta
elif p.speed < settings.STAY_AVG_SPEED:
stay_time += time_delta
distance += dist
prev_p = p
move_time = link_time - stay_time
return {
'link_time': link_time,
'move_time': move_time,
'stay_time': stay_time,
'distance': distance,
}
def lat_lon_grid_deltas(longitude, latitude, **kwargs):
r"""Calculate the delta between grid points that are in a latitude/longitude format.
Calculate the signed delta distance between grid points when the grid spacing is defined by
delta lat/lon rather than delta x/y
Parameters
----------
longitude : array_like
array of longitudes defining the grid
latitude : array_like
array of latitudes defining the grid
kwargs
Other keyword arguments to pass to :class:`~pyproj.Geod`
Returns
-------
dx, dy: 2D arrays of signed deltas between grid points in the x and y direction
Notes
-----
Accepts, 1D or 2D arrays for latitude and longitude
Assumes [Y, X] for 2D arrays
"""
# Inputs must be the same number of dimensions
if latitude.ndim != longitude.ndim:
raise ValueError(
'Latitude and longitude must have the same number of dimensions.')
# If we were given 1D arrays, make a mesh grid
if latitude.ndim < 2:
longitude, latitude = np.meshgrid(longitude, latitude)
geod_args = {'ellps': 'sphere'}
geod_args.update(**kwargs)
g = Geod(**geod_args)
forward_az, _, dy = g.inv(longitude[:-1, :], latitude[:-1, :],
longitude[1:, :], latitude[1:, :])
dy[(forward_az < -90.) | (forward_az > 90.)] *= -1
forward_az, _, dx = g.inv(longitude[:, :-1], latitude[:, :-1],
longitude[:, 1:], latitude[:, 1:])
dx[(forward_az < 0.) | (forward_az > 180.)] *= -1
return dx * units.meter, dy * units.meter
def __init__(self,
peg_lat,
peg_lon,
peg_heading,
distance,
peg_h=0.,
mode='center',
ellps='WGS84',
radians=False):
"""Initialize with a peg-point and a heading and a distance.
mode: 'center', 'start', or 'end'. The peg-point location in the path.
ellps: ellipsoid.
"""
self.peg_lat = peg_lat
self.peg_lon = peg_lon
self.peg_heading = peg_heading
self.distance = distance
self.peg_h = peg_h
self.mode = mode
self.geod = Geod(ellps=ellps)
if mode == 'start':
lat0 = peg_lat
lon0 = peg_lon
lon1, lat1, hdg = self.geod.fwd(lon0, lat0, peg_heading, distance)
elif mode == 'end':
lat1 = peg_lat
lon1 = peg_lon
hdg = (peg_heading + 180.) % 360.
lon0, lat0, hdg = self.geod.fwd(lon1, lat1, hdg, distance)
else:
hdg = (peg_heading + 180.) % 360.
lon0, lat0, hdg = self.geod.fwd(peg_lon, peg_lat, hdg,
distance / 2.)
lon1, lat1, hdg = self.geod.fwd(peg_lon, peg_lat, peg_heading,
distance / 2.)
GeodeticPath.__init__(self,
lon0,
lat0,
lon1,
lat1,
ellps=ellps,
radians=False)
def test_geod_cities():
# specify the lat/lons of some cities.
boston_lat = 42.0 + (15.0 / 60.0)
boston_lon = -71.0 - (7.0 / 60.0)
portland_lat = 45.0 + (31.0 / 60.0)
portland_lon = -123.0 - (41.0 / 60.0)
g1 = Geod(ellps="clrk66")
g2 = Geod(ellps="WGS84")
az12, az21, dist = g1.inv(boston_lon, boston_lat, portland_lon,
portland_lat)
print("distance between boston and portland, clrk66:")
print("%7.3f %6.3f %12.3f" % (az12, az21, dist))
assert_almost_equal((az12, az21, dist), (-66.531, 75.654, 4164192.708),
decimal=3)
print("distance between boston and portland, WGS84:")
az12, az21, dist = g2.inv(boston_lon, boston_lat, portland_lon,
portland_lat)
assert_almost_equal((az12, az21, dist), (-66.530, 75.654, 4164074.239),
decimal=3)
print("%7.3f %6.3f %12.3f" % (az12, az21, dist))
print("testing pickling of Geod instance")
with temporary_directory() as tmpdir:
with open(os.path.join(tmpdir, "geod1.pickle"), "wb") as gp1w:
pickle.dump(g1, gp1w, -1)
with open(os.path.join(tmpdir, "geod2.pickle"), "wb") as gp2w:
pickle.dump(g2, gp2w, -1)
with open(os.path.join(tmpdir, "geod1.pickle"), "rb") as gp1:
g3 = pickle.load(gp1)
with open(os.path.join(tmpdir, "geod2.pickle"), "rb") as gp2:
g4 = pickle.load(gp2)
az12, az21, dist = g3.inv(boston_lon, boston_lat, portland_lon,
portland_lat)
assert_almost_equal((az12, az21, dist), (-66.531, 75.654, 4164192.708),
decimal=3)
print("distance between boston and portland, clrk66 (from pickle):")
print("%7.3f %6.3f %12.3f" % (az12, az21, dist))
az12, az21, dist = g4.inv(boston_lon, boston_lat, portland_lon,
portland_lat)
print("distance between boston and portland, WGS84 (from pickle):")
print("%7.3f %6.3f %12.3f" % (az12, az21, dist))
assert_almost_equal((az12, az21, dist), (-66.530, 75.654, 4164074.239),
decimal=3)
g3 = Geod("+ellps=clrk66") # proj4 style init string
print("inverse transform")
lat1pt = 42.0 + (15.0 / 60.0)
lon1pt = -71.0 - (7.0 / 60.0)
lat2pt = 45.0 + (31.0 / 60.0)
lon2pt = -123.0 - (41.0 / 60.0)
az12, az21, dist = g3.inv(lon1pt, lat1pt, lon2pt, lat2pt)
print("%7.3f %6.3f %12.3f" % (az12, az21, dist))
assert_almost_equal((az12, az21, dist), (-66.531, 75.654, 4164192.708),
decimal=3)
def midpoint_shortest(north_lat, west_lon, south_lat, east_lon):
g = Geod(ellps='WGS84')
af, ab, dist = g.inv(west_lon, north_lat, east_lon, south_lat)
rlon, rlat, az = g.fwd(west_lon, north_lat, af, dist / 2)
# decimal places degrees distance
# 0 1 111 km
# 1 0.1 11.1 km
# 2 0.01 1.11 km
# 3 0.001 111 m
# 4 0.0001 11.1 m
# 5 0.00001 1.11 m
# 6 0.000001 0.111 m
# 7 0.0000001 1.11 cm
# 8 0.00000001 1.11 mm
rlon = round(rlon, 6)
rlat = round(rlat, 6)
return rlat, rlon
def kml_trackers(request):
trackers = Tracker.objects.filter(Q(view_users=request.user) | Q(creator=request.user))
placemarks = ""
g = Geod(ellps='clrk66')
added_tracker_pks = []
for tr in trackers:
if tr.pk in added_tracker_pks:
continue
added_tracker_pks.append(tr.pk)
pos_qs = Position.objects.filter(tracker=tr).order_by('-date')
count = pos_qs.count()
if not count:
continue
pos_qs = pos_qs.order_by('-date')
pos = pos_qs[0]
p = pos.point
p_prev = None
angle = 0.0
stay = None
if datetime.datetime.now() - pos.date > datetime.timedelta(seconds=settings.MIN_LINK_TIMEOUT):
stay = True
elif pos.speed != None:
stay = pos.speed <= settings.STAY_AVG_SPEED
if count > 1:
pos_prev = pos_qs[1]
p_prev = pos_prev.point
angle, angle2, dist = g.inv(p_prev.x, p_prev.y, p.x, p.y)
if stay == None:
avg_speed = dist/float((pos.date-pos_prev.date).seconds)
avg_speed = avg_speed*10/36.
logger.debug("avg_speed: %s" % avg_speed)
stay = avg_speed <= settings.STAY_AVG_SPEED
if stay == None:
stay = True
if stay:
image_url = settings.MEDIA_URL + 'images/icons/busstop.png'
graphic = 'circle'
angle = 0.0
else:
image_url = settings.MEDIA_URL + 'images/icons/bus.png'
graphic = 'bus'
marker_color = tr.marker_color if tr.marker_color else '00ff00'
placemarks += """<Placemark><name>%s</name><description>%s</description><angle>%1.4f</angle><image>%s</image><graphic>%s</graphic><marker_color>#%s</marker_color><Point><coordinates>%1.6f,%1.6f</coordinates></Point></Placemark>""" % (tr.name, tr.description, angle, image_url, graphic, marker_color, p.x, p.y)
kml = """<?xml version="1.0" encoding="UTF-8"?><kml xmlns="http://earth.google.com/kml/2.2"><Document>%s</Document></kml>""" % placemarks
return HttpResponse(kml)
def distances_from_cross_section(cross):
"""Calculate the distances in the x and y directions along a cross-section.
Parameters
----------
cross : `xarray.DataArray`
The input DataArray of a cross-section from which to obtain geometeric distances in
the x and y directions.
Returns
-------
x, y : tuple of `xarray.DataArray`
A tuple of the x and y distances as DataArrays
"""
if (CFConventionHandler.check_axis(cross.metpy.x, 'lon')
and CFConventionHandler.check_axis(cross.metpy.y, 'lat')):
# Use pyproj to obtain x and y distances
from pyproj import Geod
g = Geod(cross.metpy.cartopy_crs.proj4_init)
lon = cross.metpy.x
lat = cross.metpy.y
forward_az, _, distance = g.inv(lon[0].values * np.ones_like(lon),
lat[0].values * np.ones_like(lat),
lon.values,
lat.values)
x = distance * np.sin(np.deg2rad(forward_az))
y = distance * np.cos(np.deg2rad(forward_az))
# Build into DataArrays
x = xr.DataArray(x, coords=lon.coords, dims=lon.dims, attrs={'units': 'meters'})
y = xr.DataArray(y, coords=lat.coords, dims=lat.dims, attrs={'units': 'meters'})
elif (CFConventionHandler.check_axis(cross.metpy.x, 'x')
and CFConventionHandler.check_axis(cross.metpy.y, 'y')):
# Simply return what we have
x = cross.metpy.x
y = cross.metpy.y
else:
raise AttributeError('Sufficient horizontal coordinates not defined.')
return x, y
def test_geometry_area_perimeter__polygon__holes():
geod = Geod(ellps="WGS84")
assert_almost_equal(
geod.geometry_area_perimeter(
Polygon(
LineString(
[Point(1, 1),
Point(1, 10),
Point(10, 10),
Point(10, 1)]),
holes=[LineString([Point(1, 2),
Point(3, 4),
Point(5, 2)])],
)),
(-944373881400.3394, 3979008.0359657984),
decimal=2,
)
def midpoint_shortest(north_lat, west_lon, south_lat, east_lon):
g = Geod(ellps='WGS84')
af, ab, dist = g.inv(west_lon, north_lat, east_lon, south_lat)
rlon, rlat, az = g.fwd(west_lon, north_lat, af, dist/2)
# decimal places degrees distance
# 0 1 111 km
# 1 0.1 11.1 km
# 2 0.01 1.11 km
# 3 0.001 111 m
# 4 0.0001 11.1 m
# 5 0.00001 1.11 m
# 6 0.000001 0.111 m
# 7 0.0000001 1.11 cm
# 8 0.00000001 1.11 mm
rlon = round(rlon, 6)
rlat = round(rlat, 6)
return rlat, rlon
def distances_from_cross_section(cross):
"""Calculate the distances in the x and y directions along a cross-section.
Parameters
----------
cross : `xarray.DataArray`
The input DataArray of a cross-section from which to obtain geometeric distances in
the x and y directions.
Returns
-------
x, y : tuple of `xarray.DataArray`
A tuple of the x and y distances as DataArrays
"""
if (CFConventionHandler.check_axis(cross.metpy.x, 'lon') and
CFConventionHandler.check_axis(cross.metpy.y, 'lat')):
# Use pyproj to obtain x and y distances
from pyproj import Geod
g = Geod(cross.metpy.cartopy_crs.proj4_init)
lon = cross.metpy.x
lat = cross.metpy.y
forward_az, _, distance = g.inv(lon[0].values * np.ones_like(lon),
lat[0].values * np.ones_like(lat),
lon.values,
lat.values)
x = distance * np.sin(np.deg2rad(forward_az))
y = distance * np.cos(np.deg2rad(forward_az))
# Build into DataArrays
x = xr.DataArray(x, coords=lon.coords, dims=lon.dims, attrs={'units': 'meters'})
y = xr.DataArray(y, coords=lat.coords, dims=lat.dims, attrs={'units': 'meters'})
elif (CFConventionHandler.check_axis(cross.metpy.x, 'x') and
CFConventionHandler.check_axis(cross.metpy.y, 'y')):
# Simply return what we have
x = cross.metpy.x
y = cross.metpy.y
else:
raise AttributeError('Sufficient horizontal coordinates not defined.')
return x, y
def get_stat_lat_lon(self, print_msg=True):
"""Get station lat/lon"""
if print_msg:
print('calculating station lat/lon')
if not os.path.isfile(self.file):
self.dload_site(print_msg=print_msg)
data = np.loadtxt(self.file, dtype=bytes, skiprows=1).astype(str)
ref_lon, ref_lat = float(data[0, 6]), 0.
e0, e_off, n0, n_off = data[0, 7:11].astype(np.float)
e0 += e_off
n0 += n_off
az = np.arctan2(e0, n0) / np.pi * 180.
dist = np.sqrt(e0**2 + n0**2)
g = Geod(ellps='WGS84')
self.site_lon, self.site_lat = g.fwd(ref_lon, ref_lat, az, dist)[0:2]
return self.site_lat, self.site_lon
def __azdist(sacobj, ellps):
"""
Return forward/backazimuth and distance using
pyproj (proj4 bindings)
"""
from pyproj import Geod
g = Geod(ellps=ellps)
stla, stlo = sacobj.stla, sacobj.stlo
evla, evlo = sacobj.evla, sacobj.evlo
az, baz, dist = g.inv(evlo, evla, stlo, stla)
# convert units so that they show the same as SAC
if az < 0:
az += 360
if baz < 0:
baz += 360
dist /= 1000
return az, baz, dist
def fitANN(act, hlayers, hunits, lr, epochs, x_train_scale, y_train, x_test_scale, y_test, foldername, workinghome):
plt.style.use("classic")
sns.set_context("poster")
sns.set_style('whitegrid')
g = Geod(ellps='clrk66')
mpl.rcParams['font.size'] = 22
def get_stat_lat_lon(self, print_msg=True):
"""Get station lat/lon"""
if print_msg:
print('calculating station lat/lon')
if not os.path.isfile(self.file):
self.dload_site(print_msg=print_msg)
data = np.loadtxt(self.file, dtype=bytes, skiprows=1).astype(str)
ref_lon, ref_lat = float(data[0, 6]), 0.
e0, e_off, n0, n_off = data[0, 7:11].astype(np.float)
e0 += e_off
n0 += n_off
az = np.arctan2(e0, n0) / np.pi * 180.
dist = np.sqrt(e0**2 + n0**2)
g = Geod(ellps='WGS84')
self.site_lon, self.site_lat = g.fwd(ref_lon, ref_lat, az, dist)[0:2]
return self.site_lat, self.site_lon
def process_nexrad(fn, f):
sweep = 0
try:
az = np.array([ray[0].az_angle for ray in f.sweeps[sweep]])
except:
return np.array([])
# Format for NEXRAD files changed (byte string and index), try for both formats
try:
ref_hdr = f.sweeps[sweep][0][4][b'REF'][0]
ref_range = np.arange(
ref_hdr.num_gates) * ref_hdr.gate_width + ref_hdr.first_gate
ref = np.array([ray[4][b'REF'][1] for ray in f.sweeps[sweep]])
except:
ref_hdr = f.sweeps[sweep][0][1]['REF'][0]
ref_range = np.arange(
ref_hdr.num_gates) * ref_hdr.gate_width + ref_hdr.first_gate
ref = np.array([ray[1]['REF'][1] for ray in f.sweeps[sweep]])
data_hdr = f.sweeps[sweep][0][1]
data = ma.array(ref)
data[data == 0] = ma.masked
g = Geod(ellps='clrk66')
try:
center_lat = np.ones([len(az), len(ref_range)]) * data_hdr.lat
center_lon = np.ones([len(az), len(ref_range)]) * data_hdr.lon
except:
# Pulled from values in PyArt if not available
center_lat = np.ones([len(az), len(ref_range)]) * 41.60444
center_lon = np.ones([len(az), len(ref_range)]) * -88.08472
az2D = np.ones_like(center_lat) * az[:, None]
rng2D = np.ones_like(center_lat) * np.transpose(ref_range[:, None]) * 1000
lon, lat, back = g.fwd(center_lon, center_lat, az2D, rng2D)
# Create timestamp in epoch (without milliseconds) for datetime later
ts = datetime.strptime(
re.search(r'\d{8}_\d{6}', fn).group(), '%Y%m%d_%H%M%S')
# Get epoch (without milliseconds), subtracting 5 hours to convert from GMT to CST
time_epoch = time.mktime(ts.timetuple()) - (5 * 3600)
ts_arr = np.ones([len(az), len(ref_range)]) * time_epoch
# Reducing dimensionality into rows of timestamp, lat, lon, and data
arr_rows = np.dstack((ts_arr, lon, lat, data))
arr_simp = arr_rows.reshape(-1, 4)
# Remove any nan values to reduce size
return arr_simp[~np.isnan(arr_simp).any(1)]
def test_ellps_name_round_trip(self):
# this could be done in a parameter fashion
for ellps_name in pj_ellps:
# skip tests, these ellipses NWL9D and WGS66 are the same
if ellps_name in ("NWL9D", "WGS66"):
continue
p = Geod(ellps=ellps_name)
expected = f"Geod(ellps='{ellps_name}')"
self.assertEqual(repr(p), expected)
def test_geometry_length__polygon__radians():
geod = Geod(ellps="WGS84")
assert_almost_equal(
geod.geometry_length(
Polygon(
LineString(
[
Point(math.radians(1), math.radians(2)),
Point(math.radians(3), math.radians(4)),
Point(math.radians(5), math.radians(2)),
]
)
),
radians=True,
),
1072185.2103813463,
decimal=2,
)
def test_ellps_name_round_trip(self):
# this could be done in a parameter fashion
for ellps_name in pj_ellps:
# skip tests, these ellipses NWL9D and WGS66 are the same
if ellps_name in ('NWL9D', 'WGS66'):
continue
p = Geod(ellps=ellps_name)
expected = "pyproj.Geod(ellps='{0}')".format(ellps_name)
self.assertEqual(repr(p), expected)
def nearest_station(lon, lat):
with open('data/nexrad_stations.json') as f:
stations = json.load(f)
g = Geod(ellps='WGS84')
min_dist = 1e10
min_k = stations.keys()[0]
for k in stations.keys():
s = stations[k]
lon_s = s['lon']
lat_s = s['lat']
az1, az2, dist = g.inv(lon, lat, lon_s, lat_s)
#print k, dist/1e3
if dist < min_dist:
min_dist = dist
min_k = k
return min_k, min_dist
def ellipsoidal_distance(a, b):
# set the ellipsoid to be used - EXPLAIN WHY THIS ONE
# this one is a pretty safe bet for global stuff
g = Geod(ellps='WGS84')
# extract nodes take the id of the nodes to be measured (a and b) use the grpah.nodes (data = True) function of
# networkx to retrieve a list of nodes in the graph data=True means that the node list contains the data stored
# inside each node, including coords, rather than just a list of ids extract the specific nodes in which we are
# interested using [a] and [b] to retrieve the node with the corresponding id from the nodes list
start = graph.nodes(data=True)[a]
end = graph.nodes(data=True)[b]
# compute forward and back azimuths, plus distance
azf, azb, distance = g.inv(start['x'], start['y'], end['x'], end['y'])
# return only the distance we are only interested in the distance
return distance
def test_geometry_area_perimeter__polygon__radians():
geod = Geod(ellps="WGS84")
assert_almost_equal(
geod.geometry_area_perimeter(
Polygon(
LineString(
[
Point(math.radians(1), math.radians(2)),
Point(math.radians(3), math.radians(4)),
Point(math.radians(5), math.radians(2)),
]
)
),
radians=True,
),
(-49187690467.58623, 1072185.2103813463),
decimal=2,
)
def to_graph(link_path, node_path):
adjacency_list = defaultdict(list)
with fiona.open(link_path) as link_collection,\
fiona.open(node_path) as node_collection:
nodes_coordinates = []
nodes_ids = []
for rec in node_collection:
nodes_coordinates.append(rec['geometry']['coordinates'])
nodes_ids.append(rec['properties']['id'])
kdtree = KDTree(nodes_coordinates)
geod = Geod(ellps="WGS84")
for rec in link_collection:
direction = rec['properties']['dir']
vel_AB = rec['properties']['VEL_AB']
vel_BA = rec['properties']['VEL_BA']
length = geod.geometry_length(shape(rec['geometry']))
time_AB = length / vel_AB * (60/1000) * 60
time_BA = length / vel_BA * (60/1000) * 60
start_point = rec['geometry']['coordinates'][0]
end_point = rec['geometry']['coordinates'][-1]
start_distance, start_pos = kdtree.query(start_point)
end_distance, end_pos = kdtree.query(end_point)
start_id = nodes_ids[start_pos]
end_id = nodes_ids[end_pos]
if direction == 1:
adjacency_list[start_id].append((time_AB, end_id))
elif direction == -1:
adjacency_list[end_id].append((time_BA, start_id))
elif direction == 0:
adjacency_list[start_id].append((time_AB, end_id))
adjacency_list[end_id].append((time_BA, start_id))
else:
raise ValueError(direction)
return adjacency_list
class Binner:
def __init__(self, city):
self.geo = Geod(ellps='clrk66')
# files
self.base_dir = '../data/dataset/{:s}/'.format(city)
limits = np.loadtxt(self.base_dir + '/box.txt')
self.top_left = limits[0]
self.bottom_right = limits[1]
# resolution in meters and in grid units
res_m = 25.0 # meters
_, _, self.width_m = self.geo.inv(self.top_left[1], self.top_left[0],
self.bottom_right[1], self.top_left[0])
_, _, self.height_m = self.geo.inv(self.top_left[1], self.top_left[0],
self.top_left[1], self.bottom_right[0])
self.n_bins_x = self.width_m / res_m
self.n_bins_y = self.height_m / res_m
self.res_lat = abs(self.top_left[0] - self.bottom_right[0]) / self.n_bins_y
self.res_lng = abs(self.top_left[1] - self.bottom_right[1]) / self.n_bins_x
# bins
self.n_bins_x = np.ceil(self.n_bins_x).astype(int)
self.n_bins_y = np.ceil(self.n_bins_y).astype(int)
self.n_bins = self.n_bins_x * self.n_bins_y
def get_bin_id(self, lat, lng):
nx = np.floor((lng-self.top_left[1]) / self.res_lng).astype(int)
ny = np.floor((self.top_left[0]-lat) / self.res_lat).astype(int)
idx = ny * self.n_bins_x + nx
if(nx >= self.n_bins_x) or (ny >= self.n_bins_y) or (nx < 0) or (ny < 0):
idx = -1
return idx
def get_bin_loc(self, bin_id):
ny = bin_id / self.n_bins_x
nx = bin_id % self.n_bins_x
lat = self.top_left[0] - (ny+0.5)*self.res_lat
lng = self.top_left[1] + (nx+0.5)*self.res_lng
return lat, lng
def calc_distance(self, lat0, lng0, lat1, lng1):
_, _, d = self.geo.inv(lng0, lat0, lng1, lat1)
return d
def get_line(turnpoints, tol=0.001, min_t=5):
"""returns line segment extremes and bisecting segment extremes """
if not (turnpoints[-1].shape == 'line'):
return []
from pyproj import Geod
clon, clat = turnpoints[-1].lon, turnpoints[
-1].lat # center point of the line
ln = turnpoints[-1].radius
t = max(ln * tol, min_t)
g = Geod(ellps="WGS84")
for tp in reversed(list(turnpoints)):
if not (tp.lat == clat and tp.lon == clon):
flon, flat = tp.lon, tp.lat
az1, az2, d = g.inv(clon, clat, flon, flat)
lon1, lat1, az = g.fwd(clon, clat, az1 - 90, ln)
lon2, lat2, az = g.fwd(clon, clat, az1 + 90, ln)
lon3, lat3, az = g.fwd(clon, clat, az1, t)
lon4, lat4, az = g.fwd(clon, clat, az2, ln + t)
# print(f'Line: {lat1}, {lon1} - {lat2}, {lon2}')
return [
Turnpoint(lat1, lon1, 0, 'optimised', 'optimised',
'optimised'),
Turnpoint(lat2, lon2, 0, 'optimised', 'optimised',
'optimised'),
Turnpoint(lat3, lon3, 0, 'optimised', 'optimised',
'optimised'),
Turnpoint(lat4, lon4, 0, 'optimised', 'optimised', 'optimised')
]
''' if all waypoints have same coordinates, returns a north-south line'''
lon1, lat1, az = g.fwd(clon, clat, 0, ln)
lon2, lat2, az = g.fwd(clon, clat, 180, ln)
lon3, lat3, az = g.fwd(clon, clat, 90, t)
lon4, lat4, az = g.fwd(clon, clat, 270, ln + t)
return [
Turnpoint(lat1, lon1, 0, 'optimised', 'optimised', 'optimised'),
Turnpoint(lat2, lon2, 0, 'optimised', 'optimised', 'optimised'),
Turnpoint(lat3, lon3, 0, 'optimised', 'optimised', 'optimised'),
Turnpoint(lat4, lon4, 0, 'optimised', 'optimised', 'optimised')
]
def geodesic(crs, start, end, steps):
r"""Construct a geodesic path between two points.
This function acts as a wrapper for the geodesic construction available in `pyproj`.
Parameters
----------
crs: `cartopy.crs`
Cartopy Coordinate Reference System to use for the output
start: (2, ) array_like
A latitude-longitude pair designating the start point of the geodesic (units are
degrees north and degrees east).
end: (2, ) array_like
A latitude-longitude pair designating the end point of the geodesic (units are degrees
north and degrees east).
steps: int, optional
The number of points along the geodesic between the start and the end point
(including the end points).
Returns
-------
`numpy.ndarray`
The list of x, y points in the given CRS of length `steps` along the geodesic.
See Also
--------
cross_section
"""
import cartopy.crs as ccrs
from pyproj import Geod
# Geod.npts only gives points *in between* the start and end, and we want to include
# the endpoints.
g = Geod(crs.proj4_init)
geodesic = np.concatenate([
np.array(start[::-1])[None],
np.array(g.npts(start[1], start[0], end[1], end[0], steps - 2)),
np.array(end[::-1])[None]
]).transpose()
points = crs.transform_points(ccrs.Geodetic(), *geodesic)[:, :2]
return points
def test_integrate(lat1, lon1, lat2, lon2):
g = Geod(ellps='sphere')
distance1 = g.inv(lon1, lat1, lon2, lat2)[2] / 1000.0
points = g.npts(lon1, lat1, lon2, lat2, int(distance1) // 1)
distance2 = 0
distance3 = 0
res = 0
for i in range(len(points) - 1):
lo1, la1, lo2, la2 = points[i] + points[i + 1]
p1 = sphere2cartesian(90 - la1, 180 - lo1) * 6371
p2 = sphere2cartesian(90 - la2, 180 - lo2) * 6371
distance2 += np.linalg.norm(p1 - p2)
az, baz, d = g.inv(lo1, la1, lo2, la2)
distance3 += d
res += abs(abs(az - baz) - 180)
distance3 /= 1000.0
res /= len(points)
print(distance1, distance2, distance3)
print(res)
def __init__(self,
census_apikey="ca22eb30af97c6b471419d7fe22b9ce9a5d1fe8d",
db=None):
# to lookup populations by census tract
self.census = Census(census_apikey)
# for distance calculations on the earth's surface
self.geod = Geod(ellps='WGS84')
# mongodb with loaded GENZ2010 cartographic boundary files
if db == None:
connection = pymongo.MongoClient(
'mongodb://*****:*****@eg-mongodb.bucknell.edu/ym015')
self.db = connection.get_default_database()
else:
self.db = db
# use the database of summary level 140 = state-county-census tract
self.col = self.db['GENZ2010_140']
self.census_col = self.db['CENSUS2010_SF1']
def geodetic_azimuth_distance(p_start,
p_end,
ellipsoid=PYPROJ_WGS84_ELLIPSOID):
"""Compute geodetic azimuth, backazimuth, and distance
from two (lat, lon) points. Assume WGS84 ellipsoid.
p_start: (lat_1, lon_1)
p_end: (lat_2, lon_2)
"""
g = Geod(ellps=ellipsoid)
azimuth, backazimuth, dist = g.inv(p_start[1], p_start[0], p_end[1],
p_end[0])
distance_km = dist / 1000
distance_degrees = central_angle_degrees_from_distance(distance_km)
return (azimuth, backazimuth, distance_degrees, distance_km)
def __compute_velocity(data: DataFrame) -> DataFrame:
"""Output has units of meters per second."""
geodetic = Geod(ellps='WGS84')
unique_datetimes = numpy.unique(data['datetime'])
for datetime_index, unique_datetime in enumerate(unique_datetimes):
unique_datetime_indices = numpy.where(
numpy.asarray(data['datetime']) == unique_datetime)[0]
for unique_datetime_index in unique_datetime_indices:
if unique_datetime_indices[-1] + 1 < len(data['datetime']):
dt = (data['datetime'].iloc[unique_datetime_indices[-1] +
1] -
data['datetime'].iloc[unique_datetime_index])
forward_azimuth, inverse_azimuth, distance = geodetic.inv(
data['longitude'].iloc[unique_datetime_indices[-1] +
1],
data['latitude'].iloc[unique_datetime_indices[-1] + 1],
data['longitude'].iloc[unique_datetime_index],
data['latitude'].iloc[unique_datetime_index],
)
else:
dt = (
data['datetime'].iloc[unique_datetime_index] -
data['datetime'].iloc[unique_datetime_indices[0] - 1])
forward_azimuth, inverse_azimuth, distance = geodetic.inv(
data['longitude'].iloc[unique_datetime_indices[0] - 1],
data['latitude'].iloc[unique_datetime_indices[0] - 1],
data['longitude'].iloc[unique_datetime_index],
data['latitude'].iloc[unique_datetime_index],
)
speed = distance / (dt / timedelta(seconds=1))
bearing = inverse_azimuth % 360
data['speed'].iloc[unique_datetime_index] = speed
data['direction'].iloc[unique_datetime_index] = bearing
data['speed'] = data['speed'].astype('float', copy=False)
data['direction'] = data['direction'].astype('float',
copy=False)
return data
def overground_distance(self, point: (float, float)) -> float:
"""
horizontal distance over ellipsoid
:param point: (x, y) point
:return: distance in ellipsodal units
"""
if not isinstance(point, numpy.ndarray):
point = numpy.array(point)
coordinates = numpy.stack([self.coordinates[:2], point], axis=0)
if self.crs.is_projected:
return numpy.hypot(*numpy.sum(numpy.diff(coordinates, axis=0), axis=0))
else:
ellipsoid = self.crs.datum.to_json_dict()["ellipsoid"]
geodetic = Geod(
a=ellipsoid["semi_major_axis"], rf=ellipsoid["inverse_flattening"]
)
return geodetic.line_length(coordinates[:, 0], coordinates[:, 1])
def rbf_cosine(self,cntr,x,y,tpr=None): ''' Calculate cosine basis function ''' length=self.sbf_dx width=self.sbf_dy strike = self.strike cntrx,cntry=cntr #print length, cntrx,cntry g = Geod(ellps='WGS84') cbf = np.zeros(x.shape) lt2k = 6371.*mt.pi/180. ln2k = lt2k*mt.cos(mt.radians(cntry)) #print ln2k rmax = mt.hypot(length,width) tmp = np.where(np.hypot((x-cntrx)*ln2k,(y-cntry)*lt2k) < rmax) cst = 1#mt.cos(mt.radians(sbf.strike)) sst = 1#mt.sin(mt.radians(sbf.strike)) # Take average of lat and lon grid interval dgrd = 0.5*((x[0,1]-x[0,0])*ln2k + (y[1,0]-y[0,0])*lt2k) if tpr is None: tpr = 7.5 for iy,ix in zip(tmp[0],tmp[1]): if True: az,baz,dist = g.inv(cntrx,cntry,x[iy,ix],y[iy,ix]) xp = abs(0.001*dist*mt.cos(mt.radians(az-strike))) yp = abs(0.001*dist*mt.sin(mt.radians(az-strike))) else: xp = abs( (x[iy,ix]-cntrx)*ln2k*sst + (y[iy,ix]-cntry)*lt2k*cst) yp = abs(-(x[iy,ix]-cntrx)*ln2k*cst + (y[iy,ix]-cntry)*lt2k*sst) xbf = 1. if xp > 0.5*length + tpr: xbf = 0. elif xp > 0.5*length - tpr: xbf = xbf*0.5*(1.+mt.cos(mt.pi*((xp-0.5*length+tpr)/(2.*tpr)))) if yp > 0.5*width + tpr: xbf = 0. elif yp > 0.5*width - tpr: xbf = xbf*0.5*(1.+mt.cos(mt.pi*((yp-0.5*width+tpr)/(2.*tpr)))) #if xbf != 0.: # print '##%7.3f %7.3f %7.2f %7.2f %g' % (x[iy,ix],y[iy,ix],xp,yp,xbf) cbf[iy,ix] = xbf return cbf
def _plot_circles(ax, evlon, evlat, maxdist, ncircles=5):
geodetic_transform = ccrs.PlateCarree()
g = Geod(ellps='WGS84')
ax.plot(evlon,
evlat,
marker='*',
markersize=20,
markeredgewidth=1,
markeredgecolor='white',
color='k',
transform=geodetic_transform,
zorder=10)
step = _round(maxdist / ncircles)
if step == 0:
step = 1
texts = []
for dist in np.arange(step, maxdist + step, step):
azimuths = np.arange(0, 360, 1)
circle = np.array(
[g.fwd(evlon, evlat, az, dist * 1e3)[0:2] for az in azimuths])
p0 = circle[np.argmax(circle[:, 1])]
ax.plot(circle[:, 0],
circle[:, 1],
color='#777777',
linestyle='--',
transform=geodetic_transform)
dist_text = '{} km'.format(int(dist))
t = ax.text(p0[0],
p0[1],
dist_text,
size=8,
weight='bold',
verticalalignment='center',
horizontalalignment='center',
clip_on=True,
transform=geodetic_transform,
zorder=10)
t.set_path_effects([
PathEffects.Stroke(linewidth=0.8, foreground='white'),
PathEffects.Normal()
])
texts.append(t)
return texts