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FIX: Elevation Angle for some products #925

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merged 1 commit into from
Apr 3, 2020
Merged

FIX: Elevation Angle for some products #925

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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@
.pydevproject
*.rej
.settings/
.spyproject
.*.sw[nop]
.sw[nop]
*.tmp
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9 changes: 8 additions & 1 deletion pyart/io/nexrad_level3.py
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Expand Up @@ -191,7 +191,10 @@ def get_range(self):
def get_elevation(self):
""" Return the sweep elevation angle in degrees. """
hw30 = self.prod_descr['halfwords_30']
elevation = struct.unpack('>h', hw30)[0] * 0.1
if self.msg_header['code'] in ELEVATION_ANGLE:
elevation = struct.unpack('>h', hw30)[0] * 0.1
else:
elevation = None
return elevation

def get_volume_start_datetime(self):
Expand Down Expand Up @@ -348,6 +351,10 @@ def _int16_to_float16(val):

_8_OR_16_LEVELS = [19, 20, 25, 27, 28, 30, 56, 78, 79, 80, 169, 171, 181]

# List of product numbers for which Halfword 30 corresponds to sweep elev angle
# Per Table V of the ICD
ELEVATION_ANGLE = [19, 20, 25, 27, 28, 30, 56, 94, 99, 159, 161, 163, 165]

PRODUCT_RANGE_RESOLUTION = {
19: 1., # 124 nm
20: 2., # 248 nm
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8 changes: 6 additions & 2 deletions pyart/io/nexradl3_read.py
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Expand Up @@ -136,8 +136,12 @@ def read_nexrad_level3(filename, field_names=None, additional_metadata=None,
fixed_angle = filemetadata('fixed_angle')
azimuth['data'] = nfile.get_azimuth()
elev = nfile.get_elevation()
elevation['data'] = np.ones((nradials, ), dtype='float32') * elev
fixed_angle['data'] = np.array([elev], dtype='float32')
if elev is not None:
elevation['data'] = np.ones((nradials, ), dtype='float32') * elev
fixed_angle['data'] = np.array([elev], dtype='float32')
else:
elevation['data'] = None
fixed_angle['data'] = None

nfile.close()
return Radar(
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