def transect_lalo(z, atr, start_lalo, end_lalo, interpolation='nearest'):
"""Extract 2D matrix (z) value along the line [start_lalo, end_lalo]"""
coord = coordinate(atr)
[y0, y1] = coord.lalo2yx([start_lalo[0], end_lalo[0]], coord_type='lat')
[x0, x1] = coord.lalo2yx([start_lalo[1], end_lalo[1]], coord_type='lon')
transect = transect_yx(z, atr, [y0, x0], [y1, x1], interpolation)
return transect
def get_los_geometry(self, geom_obj, print_msg=False):
"""Get the Line-of-Sight geometry info in incidence and azimuth angle in degrees."""
lat, lon = self.get_stat_lat_lon(print_msg=print_msg)
# get LOS geometry
if isinstance(geom_obj, str):
# geometry file
atr = readfile.read_attribute(geom_obj)
coord = coordinate(atr, lookup_file=geom_obj)
y, x = coord.geo2radar(lat, lon, print_msg=print_msg)[0:2]
# check against image boundary
y = max(0, y); y = min(int(atr['LENGTH'])-1, y)
x = max(0, x); x = min(int(atr['WIDTH'])-1, x)
box = (x, y, x+1, y+1)
inc_angle = readfile.read(geom_obj, datasetName='incidenceAngle', box=box, print_msg=print_msg)[0][0,0]
az_angle = readfile.read(geom_obj, datasetName='azimuthAngle', box=box, print_msg=print_msg)[0][0,0]
elif isinstance(geom_obj, dict):
# use mean inc/az_angle from metadata
inc_angle = ut.incidence_angle(geom_obj, dimension=0, print_msg=print_msg)
az_angle = ut.heading2azimuth_angle(float(geom_obj['HEADING']))
else:
raise ValueError('input geom_obj is neight str nor dict: {}'.format(geom_obj))
return inc_angle, az_angle
def read_timeseries_lalo(lat,
lon,
ts_file,
lookup_file=None,
ref_lat=None,
ref_lon=None,
win_size=1):
""" Read time-series of one pixel with input lat/lon
Parameters: lat/lon : float, latitude/longitude
ts_file : string, filename of time-series HDF5 file
lookup_file : string, filename of lookup table file
ref_lat/lon : float, latitude/longitude of reference pixel
Returns: dates : 1D np.array of datetime.datetime objects, i.e. datetime.datetime(2010, 10, 20, 0, 0)
dis : 1D np.array of float in meter
"""
atr = readfile.read_attribute(ts_file)
coord = coordinate(atr, lookup_file=lookup_file)
y, x = coord.geo2radar(lat, lon)[0:2]
print('input lat / lon: {} / {}'.format(lat, lon))
ref_y, ref_x = None, None
if ref_lat is not None:
ref_y, ref_x = coord.geo2radar(ref_lat, ref_lon)[0:2]
dates, dis = read_timeseries_yx(y,
x,
ts_file,
ref_y=ref_y,
ref_x=ref_x,
win_size=win_size)
return dates, dis
def get_los_geometry(self, geom_obj, print_msg=False):
lat, lon = self.get_stat_lat_lon(print_msg=print_msg)
# get LOS geometry
if isinstance(geom_obj, str):
# geometry file
atr = readfile.read_attribute(geom_obj)
coord = coordinate(atr, lookup_file=geom_obj)
y, x = coord.geo2radar(lat, lon, print_msg=print_msg)[0:2]
box = (x, y, x + 1, y + 1)
inc_angle = readfile.read(geom_obj,
datasetName='incidenceAngle',
box=box,
print_msg=print_msg)[0][0, 0]
az_angle = readfile.read(geom_obj,
datasetName='azimuthAngle',
box=box,
print_msg=print_msg)[0][0, 0]
head_angle = ut.azimuth2heading_angle(az_angle)
elif isinstance(geom_obj, dict):
# use mean inc/head_angle from metadata
inc_angle = ut.incidence_angle(geom_obj,
dimension=0,
print_msg=print_msg)
head_angle = float(geom_obj['HEADING'])
# for old reading of los.rdr band2 data into headingAngle directly
if (head_angle + 180.) > 45.:
head_angle = ut.azimuth2heading_angle(head_angle)
else:
raise ValueError(
'input geom_obj is neight str nor dict: {}'.format(geom_obj))
return inc_angle, head_angle
def read_timeseries_lalo(lat,
lon,
ts_file,
lookup_file=None,
ref_lat=None,
ref_lon=None,
zero_first=True,
win_size=1,
unit='m',
method='mean',
print_msg=True):
""" Read time-series of one pixel with input lat/lon
Parameters: lat/lon - float, latitude/longitude
ts_file - string, filename of time-series HDF5 file
lookup_file - string, filename of lookup table file
ref_lat/lon - float, latitude/longitude of reference pixel
zero_first - bool, shift the time-series so that it starts from zero
win_size - int, windows size centered at point of interest
unit - str, output displacement unit
method - str, method to calculate the output displacement and its dispersity
Returns: dates - 1D np.ndarray of datetime.datetime objects, i.e. datetime.datetime(2010, 10, 20, 0, 0)
dis - 1D np.ndarray of float32, displacement
dis_std - 1D np.ndarray of float32, displacement dispersity
"""
atr = readfile.read_attribute(ts_file)
coord = coordinate(atr, lookup_file=lookup_file)
y, x = coord.geo2radar(lat, lon)[0:2]
if print_msg:
print('input lat / lon: {} / {}'.format(lat, lon))
print('corresponding y / x: {} / {}'.format(y, x))
# reference pixel
ref_y, ref_x = None, None
if ref_lat is not None:
ref_y, ref_x = coord.geo2radar(ref_lat, ref_lon)[0:2]
# call read_timeseries_yx()
dates, dis, dis_std = read_timeseries_yx(y,
x,
ts_file,
ref_y=ref_y,
ref_x=ref_x,
zero_first=zero_first,
win_size=win_size,
unit=unit,
method=method,
print_msg=False)
return dates, dis, dis_std
def transect_yx(z, atr, start_yx, end_yx, interpolation='nearest'):
"""Extract 2D matrix (z) value along the line [x0,y0;x1,y1]
Link: http://stackoverflow.com/questions/7878398/how-to-extract-an-arbitrary-line-of-values-from-a-numpy-array
Parameters: z : (np.array) 2D data matrix
atr : (dict) attribute
start_yx : (list) y,x coordinate of start point
end_yx : (list) y,x coordinate of end point
interpolation : str, sampling/interpolation method, including:
'nearest' - nearest neighbour
'linear' - linear spline interpolation (order of 1)
'cubic' - cubic spline interpolation (order of 3)
'quintic' - quintic spline interpolation (order of 5)
Returns: transect: (dict) containing 1D matrix:
'X' - 1D np.array for X/column coordinates in float32
'Y' - 1D np.array for Y/row. coordinates in float32
'value' - 1D np.array for z value in float32
'distance' - 1D np.array for distance in float32
Example: transect = transect_yx(dem, demRsc, [10,15], [100,115])
"""
interpolation = interpolation.lower()
[y0, x0] = start_yx
[y1, x1] = end_yx
# check
length, width = int(atr['LENGTH']), int(atr['WIDTH'])
if not all(0 <= i < width and 0 <= j < length
for i, j in zip([x0, x1], [y0, y1])):
msg = 'input start/end point is out of data coverage'
msg += '\nstart_yx: {}'.format(start_yx)
msg += '\nend_yx:{}'.format(end_yx)
msg += '\ndata size: ({}, {})'.format(length, width)
raise ValueError(msg)
# Determine points coordinates along the line
num_pts = int(np.hypot(x1 - x0, y1 - y0))
ys = np.linspace(y0, y1, num_pts, dtype=np.float32)
xs = np.linspace(x0, x1, num_pts, dtype=np.float32)
# Extract z value along the line
# for nearest neighbor sampling, use indexing directly
# for other interpolation, use scipy.ndimage.map_coordinates
if interpolation == 'nearest':
z_line = z[np.rint(ys).astype(np.int), np.rint(xs).astype(np.int)]
else:
# interpolation name to order
interpolate_name2order = {
'linear': 1,
'cubic': 3,
'quintic': 5,
}
if interpolation not in interpolate_name2order.keys():
msg = 'un-supported interpolation method: {}'.format(interpolation)
msg += '\navailable methods: {}'.format(
interpolate_name2order.keys())
raise ValueError(msg)
interp_order = interpolate_name2order[interpolation.lower()]
# run interpolation
z_line = map_coordinates(z, np.vstack((ys, xs)), order=interp_order)
# Calculate Distance along the line
earth_radius = 6.3781e6 # in meter
dist_unit = 'm'
if 'Y_FIRST' in atr.keys():
[lat0, lat1] = coordinate(atr).yx2lalo([y0, y1], coord_type='y')
lat_c = (lat0 + lat1) / 2.
x_step = float(atr['X_STEP']) * np.pi / 180.0 * earth_radius * np.cos(
lat_c * np.pi / 180)
y_step = float(atr['Y_STEP']) * np.pi / 180.0 * earth_radius
else:
try:
x_step = range_ground_resolution(atr)
y_step = azimuth_ground_resolution(atr)
except KeyError:
x_step = 1
y_step = 1
dist_unit = 'pixel'
dist_line = np.hypot((xs - x0) * x_step, (ys - y0) * y_step)
# remove points in masked out areas
mask = ~np.isnan(z_line)
mask *= z_line != 0.0
# prepare output
transect = {}
transect['Y'] = ys[mask]
transect['X'] = xs[mask]
transect['value'] = z_line[mask]
transect['distance'] = dist_line[mask]
transect['distance_unit'] = dist_unit
return transect
def transect_yx(z, atr, start_yx, end_yx, interpolation='nearest'):
"""Extract 2D matrix (z) value along the line [x0,y0;x1,y1]
Ref link: http://stackoverflow.com/questions/7878398/how-to-e
xtract-an-arbitrary-line-of-values-from-a-numpy-array
Parameters: z : (np.array) 2D data matrix
atr : (dict) attribute
start_yx : (list) y,x coordinate of start point
end_yx : (list) y,x coordinate of end point
interpolation : str, sampling/interpolation method, including:
'nearest' - nearest neighbour, by default
'cubic' - cubic interpolation
'bilinear' - bilinear interpolation
Returns: transect: (dict) containing 1D matrix:
'X' - 1D np.array for X/column coordinates in float32
'Y' - 1D np.array for Y/row. coordinates in float32
'value' - 1D np.array for z value in float32
'distance' - 1D np.array for distance in float32
Example: transect = transect_yx(dem, demRsc, [10,15], [100,115])
"""
[y0, x0] = start_yx
[y1, x1] = end_yx
# check
length, width = int(atr['LENGTH']), int(atr['WIDTH'])
if not all(0 <= i < width and 0 <= j < length
for i, j in zip([x0, x1], [y0, y1])):
msg = 'input start/end point is out of data coverage'
msg += '\nstart_yx: {}'.format(start_yx)
msg += '\nend_yx:{}'.format(end_yx)
msg += '\ndata size: ({}, {})'.format(length, width)
raise ValueError(msg)
# Determine points coordinates along the line
num_pts = int(np.hypot(x1 - x0, y1 - y0))
ys = np.linspace(y0, y1, num_pts, dtype=np.float32)
xs = np.linspace(x0, x1, num_pts, dtype=np.float32)
# Extract z value along the line
if interpolation.lower() == 'nearest':
z_line = z[np.rint(ys).astype(np.int), np.rint(xs).astype(np.int)]
elif interpolation.lower() == 'cubic':
z_line = map_coordinates(z, np.vstack((ys, xs)), order=3)
elif interpolation.lower() == 'bilinear':
z_line = map_coordinates(z, np.vstack((ys, xs)), order=2)
else:
print('Un-recognized interpolation method: ' + interpolation)
print('Continue with nearest ...')
z_line = z[np.rint(ys).astype(np.int),
np.rint(xs).astype(np.int)] # nearest neighbour
# Calculate Distance along the line
earth_radius = 6.3781e6 # in meter
if 'Y_FIRST' in atr.keys():
[lat0, lat1] = coordinate(atr).yx2lalo([y0, y1], coord_type='y')
lat_c = (lat0 + lat1) / 2.
x_step = float(atr['X_STEP']) * np.pi / 180.0 * earth_radius * np.cos(
lat_c * np.pi / 180)
y_step = float(atr['Y_STEP']) * np.pi / 180.0 * earth_radius
else:
x_step = range_ground_resolution(atr)
y_step = azimuth_ground_resolution(atr)
dist_line = np.hypot((xs - x0) * x_step, (ys - y0) * y_step)
# remove points in masked out areas
mask = ~np.isnan(z_line)
mask *= z_line != 0.0
# prepare output
transect = {}
transect['Y'] = ys[mask]
transect['X'] = xs[mask]
transect['value'] = z_line[mask]
transect['distance'] = dist_line[mask]
return transect
def update_attribute4radar2geo(atr_in,
shape2d=None,
lalo_step=None,
SNWE=None,
lut_file=None,
res_obj=None,
print_msg=True):
"""update input dictionary of attributes due to resampling from radar to geo coordinates
Parameters: atr_in - dict, input dictionary of attributes
# combination 1
shape2d - tuple of 2 int in (length, width)
lalo_step - tuple of 2 float, step size in lat/lon direction
SNWE - tuple of 4 float
lut_file - str, path of lookup table file
# combination 2
res_obj - mintpy.objects.resample.resample object
Returns: atr - dict, updated dictionary of attributes
"""
# make a copy of original meta dict
atr = dict(atr_in)
# grab info from res_obj
if res_obj is not None:
shape2d = (res_obj.length, res_obj.width)
lalo_step = res_obj.lalo_step
SNWE = res_obj.SNWE
lut_file = res_obj.lut_file
atr['LENGTH'] = shape2d[0]
atr['WIDTH'] = shape2d[1]
atr['Y_STEP'] = lalo_step[0]
atr['X_STEP'] = lalo_step[1]
atr['Y_FIRST'] = SNWE[1]
atr['X_FIRST'] = SNWE[2]
lut_meta = readfile.read_attribute(lut_file)
atr['Y_UNIT'] = lut_meta.get('Y_UNIT', 'degrees')
atr['X_UNIT'] = lut_meta.get('X_UNIT', 'degrees')
# Reference point from y/x to lat/lon
if 'REF_Y' in atr.keys():
coord = coordinate(atr_in, lookup_file=lut_file)
ref_lat, ref_lon = coord.radar2geo(np.array(int(atr['REF_Y'])),
np.array(int(atr['REF_X'])),
print_msg=False)[0:2]
if ~np.isnan(ref_lat) and ~np.isnan(ref_lon):
ref_y = int(
np.rint(
(ref_lat - float(atr['Y_FIRST'])) / float(atr['Y_STEP'])))
ref_x = int(
np.rint(
(ref_lon - float(atr['X_FIRST'])) / float(atr['X_STEP'])))
atr['REF_LAT'] = str(ref_lat)
atr['REF_LON'] = str(ref_lon)
atr['REF_Y'] = str(ref_y)
atr['REF_X'] = str(ref_x)
if print_msg:
print('update REF_LAT/LON/Y/X')
else:
warnings.warn(
"original reference pixel is out of .trans file's coverage. Continue."
)
try:
atr.pop('REF_Y')
atr.pop('REF_X')
except:
pass
try:
atr.pop('REF_LAT')
atr.pop('REF_LON')
except:
pass
return atr
