def process_file(filename, outdir, debug=False, verbose=False):
"""
"""
# Read radar data
if USE_RADX:
radar = read_radx(filename)
else:
radar = read(filename, exclude_fields=None)
# Radar VCP check
if CHECK_VCP:
if NSWEEPS is not None and radar.nsweeps != NSWEEPS:
return
if verbose:
print 'Processing file: {}'.format(os.path.basename(filename))
if debug:
print 'Number of sweeps: {}'.format(radar.nsweeps)
if USE_RADX:
# Create file metadata object
meta = FileMetadata(
'nexrad_archive', field_names=None, additional_metadata=None,
file_field_names=False, exclude_fields=None)
# Remove unnecessary fields
for field in REMOVE_FIELDS:
radar.fields.pop(field, None)
# Rename fields to default Py-ART names
for field in radar.fields.keys():
default_field = meta.get_field_name(field)
radar.fields[default_field] = radar.fields.pop(field, None)
# Step 1: Determine radar significant detection
# Since NEXRAD WSR-88D Level II data is already processed to some degree,
# this amounts to essentially removing salt and pepper noise
gf = noise._significant_features(
radar, REFL_FIELD, gatefilter=None, size_bins=SIZE_BINS,
size_limits=SIZE_LIMITS, structure=STRUCTURE, remove_size_field=False,
fill_value=None, size_field=None, debug=debug)
gf = noise.significant_detection(
radar, gatefilter=gf, remove_small_features=False, size_bins=SIZE_BINS,
size_limits=SIZE_LIMITS, fill_holes=FILL_HOLES, dilate=DILATE,
structure=STRUCTURE, iterations=1, rays_wrap_around=False,
min_ncp=None, detect_field=None, debug=debug, verbose=verbose)
# Step 2: Doppler velocity correction
if DEALIAS == 'phase':
vdop_corr = dealias_unwrap_phase(
radar, gatefilter=gf, unwrap_unit='sweep', nyquist_vel=None,
rays_wrap_around=True, keep_original=False, vel_field=None,
corr_vel_field=VDOP_CORR_FIELD)
elif DEALIAS == 'region':
vdop_corr = dealias_region_based(
radar, gatefilter=gf, interval_splits=INTERVAL_SPLITS,
interval_limits=None, skip_between_rays=2, skip_along_ray=2,
centered=True, nyquist_vel=None, rays_wrap_around=True,
keep_original=False, vel_field=None,
corr_vel_field=VDOP_CORR_FIELD)
else:
raise ValueError('Unsupported velocity correction routine')
radar.add_field(VDOP_CORR_FIELD, vdop_corr, replace_existing=True)
# Step 3: Reflectivity correction
# Currently no correction procedures are applied to the reflectivity field
# due to minimal attenuation at S-band
refl_corr = radar.fields[REFL_FIELD].copy()
radar.add_field(REFL_CORR_FIELD, refl_corr, replace_existing=True)
# Step 4: Interpolate missing gates
basic_fixes.interpolate_missing(
radar, fields=FILL_FIELDS, interp_window=FILL_WINDOW,
interp_sample=FILL_SAMPLE, kind='mean', rays_wrap_around=False,
fill_value=None, debug=debug, verbose=verbose)
# Add metadata
_add_metadata(radar, filename)
# ARM file name protocols
date_stamp = datetimes_from_radar(radar).min().strftime('%Y%m%d.%H%M%S')
fname = 'nexradwsr88d{}cmac{}.{}.{}.cdf'.format(QF, FN, DL, date_stamp)
# Write CMAC NetCDF file
write_cfradial(os.path.join(outdir, fname), radar, format=FORMAT,
arm_time_variables=True)
return
def process_file(filename, outdir, debug=False, verbose=False):
"""
"""
if verbose:
print 'Processing file: {}'.format(os.path.basename(filename))
# Read radar data
radar = read_mdv(filename, exclude_fields=EXLUDE_FIELDS)
if debug:
print 'Number of sweeps: {}'.format(radar.nsweeps)
# Step 1: Remove last 7 gates from each ray
# These gates are reserved for signal testing only
for field in radar.fields.keys():
if verbose:
print 'Removing signal testing gates: {}'.format(field)
radar.fields[field]['data'][:,-7:] = np.ma.masked
# Step 2: Radar significant detection
# Includes Doppler velocity coherency, Doppler velocity phasor coherency,
# and significant echo boundary detection
gf = noise.velocity_coherency(
radar, gatefilter=None, text_bins=VDOP_TEXT_BINS,
text_limits=VDOP_TEXT_LIMITS, texture_window=TEXTURE_WINDOW,
texture_sample=TEXTURE_SAMPLE, max_texture=None, nyquist=None,
rays_wrap_around=False, remove_small_features=False, fill_value=None,
vdop_field=VDOP_FIELD, text_field=None, coherent_field=None,
debug=debug, verbose=verbose)
gf = noise.velocity_phasor_coherency(
radar, gatefilter=gf, text_bins=PHASOR_TEXT_BINS,
text_limits=PHASOR_TEXT_LIMITS, texture_window=TEXTURE_WINDOW,
texture_sample=TEXTURE_SAMPLE, max_texture=None,
rays_wrap_around=False, remove_small_features=False, fill_value=None,
vdop_field=VDOP_FIELD, phasor_field=None, text_field=None,
coherent_field=None, debug=debug, verbose=verbose)
gf = noise.echo_boundaries(
radar, gatefilter=gf, texture_window=TEXTURE_WINDOW,
texture_sample=TEXTURE_SAMPLE, min_texture=None,
bounds_percentile=BOUNDS_PERCENTILE, remove_small_features=False,
rays_wrap_around=False, fill_value=None, sqi_field=NCP_FIELD,
text_field=None, bounds_field=None, debug=debug, verbose=verbose)
gf = noise.significant_detection(
radar, gatefilter=gf, remove_small_features=True, size_bins=SIZE_BINS,
size_limits=SIZE_LIMITS, fill_holes=FILL_HOLES, dilate=DILATE,
structure=STRUCTURE, iterations=ITERATIONS, min_ncp=MIN_NCP,
ncp_field=NCP_FIELD, detect_field=None, debug=debug, verbose=verbose)
# Step 3: Compute radar texture fields
texture_fields.add_textures(
radar, fields=TEXTURE_FIELDS, gatefilter=None,
texture_window=TEXTURE_WINDOW, texture_sample=TEXTURE_SAMPLE,
min_sweep=None, max_sweep=None, min_range=None, max_range=None,
min_ncp=None, rays_wrap_around=False, fill_value=None,
ncp_field=NCP_FIELD)
# Step 4: Doppler velocity correction
if DEALIAS.upper() == 'REGION':
vdop_corr = dealias_region_based(
radar, gatefilter=gf, interval_splits=INTERVAL_SPLITS,
interval_limits=None, skip_between_rays=2, skip_along_ray=2,
centered=True, nyquist_vel=None, rays_wrap_around=True,
keep_original=False, vel_field=VDOP_FIELD,
corr_vel_field=CORR_VDOP_FIELD)
else:
raise ValueError('Unsupported velocity correction routine')
radar.add_field(CORR_VDOP_FIELD, vdop_corr, replace_existing=False)
# TODO
# Step 5: Reflectivity correction
refl_corr = radar.fields[REFL_FIELD].copy()
radar.add_field(CORR_REFL_FIELD, refl_corr, replace_existing=False)
# Step 6: Interpolate missing gates
basic_fixes.interpolate_missing(
radar, fields=FILL_FIELDS, interp_window=FILL_WINDOW,
interp_sample=FILL_SAMPLE, kind='mean', rays_wrap_around=False,
fill_value=None, debug=debug, verbose=verbose)
# Step 7: Remove unwanted fields before writing
for field in REMOVE_FIELDS:
if verbose:
print 'Removing radar field before writing: {}'.format(field)
radar.fields.pop(field, None)
# Parse metadata
_add_metadata(radar, filename)
# ARM file name protocols
date = datetimes_from_radar(radar).min().strftime('%Y%m%d.%H%M%S')
fname = 'sgpcsaprsurcmac{}.{}.{}.cdf'.format(FN, DL, date)
# Write CMAC NetCDF file
write_cfradial(os.path.join(outdir, fname), radar, format=FORMAT,
arm_time_variables=True)
return
