def _get_sunlight_coverage(area_def, start_time, overpass=None):
"""Get the sunlight coverage of *area_def* at *start_time* as a value between 0 and 1."""
if area_def.proj_dict.get('proj') == 'geos':
adp = Boundary(*get_geostationary_bounding_box(
area_def, nb_points=100)).contour_poly
else:
adp = AreaDefBoundary(area_def, frequency=100).contour_poly
poly = get_twilight_poly(start_time)
if overpass is not None:
ovp = overpass.boundary.contour_poly
cut_area_poly = adp.intersection(ovp)
else:
cut_area_poly = adp
if cut_area_poly is None:
if not adp._is_inside(ovp):
return 0.0
else:
# Should already have been taken care of in pyresample.spherical.intersection
cut_area_poly = adp
daylight = cut_area_poly.intersection(poly)
if daylight is None:
if sun_zenith_angle(start_time, *area_def.get_lonlat(0, 0)) < 90:
return 1.0
else:
return 0.0
else:
daylight_area = daylight.area()
total_area = cut_area_poly.area()
return daylight_area / total_area
def get_area_slices(data_area, area_to_cover):
"""Compute the slice to read from an *area* based on an *area_to_cover*."""
if data_area.proj_dict['proj'] != 'geos':
raise NotImplementedError('Only geos supported')
# Intersection only required for two different projections
if area_to_cover.proj_dict['proj'] == data_area.proj_dict['proj']:
LOGGER.debug('Projections for data and slice areas are'
' identical: {}'.format(area_to_cover.proj_dict['proj']))
# Get xy coordinates
llx, lly, urx, ury = area_to_cover.area_extent
x, y = data_area.get_xy_from_proj_coords([llx, urx], [lly, ury])
return slice(x[0], x[1] + 1), slice(y[1], y[0] + 1)
data_boundary = Boundary(*get_geostationary_bounding_box(data_area))
area_boundary = AreaDefBoundary(area_to_cover, 100)
intersection = data_boundary.contour_poly.intersection(
area_boundary.contour_poly)
x, y = data_area.get_xy_from_lonlat(np.rad2deg(intersection.lon),
np.rad2deg(intersection.lat))
return slice(min(x), max(x) + 1), slice(min(y), max(y) + 1)
def check_file_covers_area(file_handler, check_area):
"""Checks if the file covers the current area.
If the file doesn't provide any bounding box information or 'area'
was not provided in `filter_parameters`, the check returns True.
"""
try:
gbb = Boundary(*file_handler.get_bounding_box())
except NotImplementedError as err:
logger.debug("Bounding box computation not implemented: %s",
str(err))
else:
abb = AreaDefBoundary(get_area_def(check_area), frequency=1000)
intersection = gbb.contour_poly.intersection(abb.contour_poly)
if not intersection:
return False
return True
def _get_sunlight_coverage(area_def,
start_time,
sza_threshold=90,
overpass=None):
"""Get the sunlight coverage of *area_def* at *start_time* as a value between 0 and 1."""
if isinstance(area_def, SwathDefinition):
lons, lats = area_def.get_lonlats()
freq = int(lons.shape[-1] * 0.10)
lons, lats = da.compute(lons[::freq, ::freq], lats[::freq, ::freq])
adp = Boundary(lons.ravel(), lats.ravel()).contour_poly
elif area_def.is_geostationary:
adp = Boundary(*get_geostationary_bounding_box(
area_def, nb_points=100)).contour_poly
else:
adp = AreaDefBoundary(area_def, frequency=100).contour_poly
poly = get_twilight_poly(start_time)
if overpass is not None:
ovp = overpass.boundary.contour_poly
cut_area_poly = adp.intersection(ovp)
else:
cut_area_poly = adp
if cut_area_poly is None:
if not adp._is_inside(ovp):
return 0.0
else:
# Should already have been taken care of in pyresample.spherical.intersection
cut_area_poly = adp
daylight = cut_area_poly.intersection(poly)
if daylight is None:
if sun_zenith_angle(start_time, *area_def.get_lonlat(
0, 0)) < sza_threshold:
return 1.0
else:
return 0.0
else:
daylight_area = daylight.area()
total_area = adp.area()
return daylight_area / total_area
def boundary_for_area(area_def: PRGeometry) -> Boundary:
"""Create Boundary object representing the provided area."""
if not FIXED_PR and isinstance(area_def, SwathDefinition):
# TODO: Persist lon/lats if requested
lons, lats = area_def.get_bbox_lonlats()
freq = int(area_def.shape[0] * 0.05)
if hasattr(lons[0], "compute") and da is not None:
lons, lats = da.compute(lons, lats)
lons = [lon_side.astype(np.float64) for lon_side in lons]
lats = [lat_side.astype(np.float64) for lat_side in lats]
adp = AreaBoundary(*zip(lons, lats))
adp.decimate(freq)
elif getattr(area_def, "is_geostationary", False):
adp = Boundary(
*get_geostationary_bounding_box(area_def, nb_points=100))
else:
freq_fraction = 0.05 if isinstance(area_def, SwathDefinition) else 0.30
adp = AreaDefBoundary(area_def,
frequency=int(area_def.shape[0] * freq_fraction))
return adp
def __init__(self, overpass, scan_step=50, frequency=200):
# compute area covered by pass
Boundary.__init__(self)
self.overpass = overpass
self.orb = overpass.orb
# compute sides
scanlength_seconds = ((overpass.falltime - overpass.risetime).seconds +
(overpass.falltime - overpass.risetime).microseconds / 1000000.0)
logger.debug("Instrument = %s", self.overpass.instrument)
if self.overpass.instrument == 'viirs':
sec_scan_duration = 1.779166667
along_scan_reduce_factor = 1
elif self.overpass.instrument.startswith("avhrr"):
sec_scan_duration = 1./6.
along_scan_reduce_factor = 0.1
elif self.overpass.instrument == 'ascat':
sec_scan_duration = 3.74747474747
along_scan_reduce_factor = 1
# Overwrite the scan step
scan_step = 1
else:
# Assume AVHRR!
logmsg = ("Instrument scan duration not known. Setting it to AVHRR. Instrument: ")
logger.info(logmsg + "%s", str(self.overpass.instrument))
sec_scan_duration = 1./6.
along_scan_reduce_factor = 0.1
# From pass length in seconds and the seconds for one scan derive the number of scans in the swath:
scans_nb = scanlength_seconds/sec_scan_duration * along_scan_reduce_factor
# Devide by the scan step to a reduced number of scans:
scans_nb = np.floor(scans_nb/scan_step)
scans_nb = int(max(scans_nb, 1))
sides_lons, sides_lats = self.get_instrument_points(self.overpass,
overpass.risetime,
scans_nb,
np.array([0, self.overpass.number_of_fovs-1]),
scan_step=scan_step)
side_shape = sides_lons[::-1, 0].shape[0]
nmod = 1
if side_shape != scans_nb:
nmod = side_shape // scans_nb
logger.debug('Number of scan lines (%d) does not match number of scans (%d)',
side_shape, scans_nb)
logger.info('Take every %d th element on the sides...', nmod)
self.left_lons = sides_lons[::-1, 0][::nmod]
self.left_lats = sides_lats[::-1, 0][::nmod]
self.right_lons = sides_lons[:, 1][::nmod]
self.right_lats = sides_lats[:, 1][::nmod]
# compute bottom
maxval = self.overpass.number_of_fovs
rest = maxval % frequency
mid_range = np.arange(rest / 2, maxval, frequency)
if mid_range[0] == 0:
start_idx = 1
else:
start_idx = 0
reduced = np.hstack([0, mid_range[start_idx::], maxval - 1]).astype('int')
lons, lats = self.get_instrument_points(self.overpass,
overpass.falltime,
1,
reduced)
self.bottom_lons = lons[0][::-1]
self.bottom_lats = lats[0][::-1]
# compute top
lons, lats = self.get_instrument_points(self.overpass,
overpass.risetime,
1,
reduced)
self.top_lons = lons[0]
self.top_lats = lats[0]
def __init__(self, overpass, scan_step=50, frequency=200):
# compute area covered by pass
Boundary.__init__(self)
self.overpass = overpass
self.orb = overpass.orb
# compute sides
scanlength_seconds = (
(overpass.falltime - overpass.risetime).seconds +
(overpass.falltime - overpass.risetime).microseconds / 1000000.0)
logger.debug("Instrument = %s", self.overpass.instrument)
if self.overpass.instrument == 'viirs':
sec_scan_duration = 1.779166667
along_scan_reduce_factor = 1
elif self.overpass.instrument.startswith("avhrr"):
sec_scan_duration = 1. / 6.
along_scan_reduce_factor = 0.1
elif self.overpass.instrument == 'ascat':
sec_scan_duration = 3.74747474747
along_scan_reduce_factor = 1
# Overwrite the scan step
scan_step = 1
elif self.overpass.instrument == 'mhs':
sec_scan_duration = 8 / 3.
along_scan_reduce_factor = 1
# Overwrite the scan step
scan_step = 1
elif self.overpass.instrument == 'atms':
sec_scan_duration = 8 / 3.
along_scan_reduce_factor = 1
# Overwrite the scan step
scan_step = 1
elif self.overpass.instrument == 'mwhs-2':
sec_scan_duration = 8 / 3.
along_scan_reduce_factor = 1
# Overwrite the scan step
scan_step = 1
else:
# Assume AVHRR!
logmsg = (
"Instrument scan duration not known. Setting it to AVHRR. Instrument: "
)
logger.info(logmsg + "%s", str(self.overpass.instrument))
sec_scan_duration = 1. / 6.
along_scan_reduce_factor = 0.1
# From pass length in seconds and the seconds for one scan derive the number of scans in the swath:
scans_nb = scanlength_seconds / sec_scan_duration * along_scan_reduce_factor
# Devide by the scan step to a reduced number of scans:
scans_nb = np.floor(scans_nb / scan_step)
scans_nb = int(max(scans_nb, 1))
sides_lons, sides_lats = self.get_instrument_points(
self.overpass,
overpass.risetime,
scans_nb,
np.array([0, self.overpass.number_of_fovs - 1]),
scan_step=scan_step)
side_shape = sides_lons[::-1, 0].shape[0]
nmod = 1
if side_shape != scans_nb:
nmod = side_shape // scans_nb
logger.debug(
'Number of scan lines (%d) does not match number of scans (%d)',
side_shape, scans_nb)
logger.info('Take every %d th element on the sides...', nmod)
self.left_lons = sides_lons[::-1, 0][::nmod]
self.left_lats = sides_lats[::-1, 0][::nmod]
self.right_lons = sides_lons[:, 1][::nmod]
self.right_lats = sides_lats[:, 1][::nmod]
# compute bottom
maxval = self.overpass.number_of_fovs
rest = maxval % frequency
mid_range = np.arange(rest / 2, maxval, frequency)
if mid_range[0] == 0:
start_idx = 1
else:
start_idx = 0
reduced = np.hstack([0, mid_range[start_idx::],
maxval - 1]).astype('int')
lons, lats = self.get_instrument_points(self.overpass,
overpass.falltime, 1, reduced)
self.bottom_lons = lons[0][::-1]
self.bottom_lats = lats[0][::-1]
# compute top
lons, lats = self.get_instrument_points(self.overpass,
overpass.risetime, 1, reduced)
self.top_lons = lons[0]
self.top_lats = lats[0]
