Clutter detection using the Gabella approach

import warnings

import matplotlib.pyplot as plt
import numpy as np
import wradlib as wrl
import wradlib_data
import xarray as xr

warnings.filterwarnings("ignore")

/home/docs/checkouts/readthedocs.org/user_builds/wradlib/conda/latest/lib/python3.13/site-packages/tqdm/auto.py:21: TqdmWarning: IProgress not found. Please update jupyter and ipywidgets. See https://ipywidgets.readthedocs.io/en/stable/user_install.html
  from .autonotebook import tqdm as notebook_tqdm

Read the data

filename = wradlib_data.DATASETS.fetch("hdf5/2014-08-10--182000.ppi.mvol")
swp = xr.open_dataset(filename, engine="gamic", group="sweep_0")
swp = swp.set_coords("sweep_mode")
swp = swp.wrl.georef.georeference()
display(swp)

Downloading file 'hdf5/2014-08-10--182000.ppi.mvol' from 'https://github.com/wradlib/wradlib-data/raw/main/data/hdf5/2014-08-10--182000.ppi.mvol' to '/home/docs/.cache/wradlib-data'.

<xarray.Dataset> Size: 33MB
Dimensions:            (azimuth: 360, range: 1000)
Coordinates: (12/15)
  * azimuth            (azimuth) float64 3kB 0.5054 1.522 2.527 ... 358.5 359.5
    elevation          (azimuth) float64 3kB 1.505 1.505 1.505 ... 1.505 1.505
    time               (azimuth) datetime64[ns] 3kB ...
  * range              (range) float32 4kB 50.0 150.0 ... 9.985e+04 9.995e+04
    x                  (azimuth, range) float64 3MB 0.4409 1.323 ... -866.6
    y                  (azimuth, range) float64 3MB 49.98 149.9 ... 9.988e+04
    ...                 ...
    bins               (azimuth, range) float32 1MB 50.0 150.0 ... 9.995e+04
    sweep_mode         <U20 80B 'azimuth_surveillance'
    longitude          float64 8B 7.072
    latitude           float64 8B 50.73
    altitude           float64 8B 99.5
    crs_wkt            int64 8B 0
Data variables: (12/17)
    KDP                (azimuth, range) float32 1MB ...
    PHIDP              (azimuth, range) float32 1MB ...
    DBZH               (azimuth, range) float32 1MB ...
    DBZV               (azimuth, range) float32 1MB ...
    RHOHV              (azimuth, range) float32 1MB ...
    DBTH               (azimuth, range) float32 1MB ...
    ...                 ...
    ZDR                (azimuth, range) float32 1MB ...
    sweep_number       int64 8B ...
    prt_mode           <U7 28B ...
    follow_mode        <U7 28B ...
    sweep_fixed_angle  float64 8B ...
    nyquist_velocity   object 8B ...
Attributes:
    source:       gamic
    pulse_width:  2

xarray.Dataset

• Dimensions:
  • azimuth: 360
  • range: 1000
• Coordinates: (15)
  • azimuth
    (azimuth)
    float64
    0.5054 1.522 2.527 ... 358.5 359.5

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([  0.505371,   1.521606,   2.526855, ..., 357.50885 , 358.514099,
           359.502869], shape=(360,))

  • elevation
    (azimuth)
    float64
    1.505 1.505 1.505 ... 1.505 1.505

    standard_name :

    ray_elevation_angle

    long_name :

    elevation_angle_from_horizontal_plane

    units :

    degrees

    axis :

    radial_elevation_coordinate

    array([1.505127, 1.505127, 1.505127, ..., 1.505127, 1.505127, 1.505127],
          shape=(360,))

  • time
    (azimuth)
    datetime64[ns]
    ...

    standard_name :

    time

    [360 values with dtype=datetime64[ns]]

  • range
    (range)
    float32
    50.0 150.0 ... 9.985e+04 9.995e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    100.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    50.0

    array([5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04, 9.995e+04],
          shape=(1000,), dtype=float32)

  • x
    (azimuth, range)
    float64
    0.4409 1.323 ... -865.7 -866.6

    axis :

    X

    long_name :

    Easting

    standard_name :

    projection_x_coordinate

    units :

    metre

    array([[ 4.40856362e-01,  1.32256868e+00,  2.20428045e+00, ...,
             8.79196725e+02,  8.80077772e+02,  8.80958818e+02],
           [ 1.32722219e+00,  3.98166534e+00,  6.63610685e+00, ...,
             2.64686983e+03,  2.64952227e+03,  2.65217471e+03],
           [ 2.20359591e+00,  6.61078567e+00,  1.10179727e+01, ...,
             4.39461573e+03,  4.39901959e+03,  4.40342345e+03],
           ...,
           [-2.17247790e+00, -6.51743169e+00, -1.08623828e+01, ...,
            -4.33255731e+03, -4.33689899e+03, -4.34124066e+03],
           [-1.29608506e+00, -3.88825396e+00, -6.48042127e+00, ...,
            -2.58477326e+03, -2.58736347e+03, -2.58995368e+03],
           [-4.33668669e-01, -1.30100560e+00, -2.16834200e+00, ...,
            -8.64862358e+02, -8.65729041e+02, -8.66595722e+02]],
          shape=(360, 1000))

  • y
    (azimuth, range)
    float64
    49.98 149.9 ... 9.978e+04 9.988e+04

    axis :

    Y

    long_name :

    Northing

    standard_name :

    projection_y_coordinate

    units :

    metre

    array([[4.99802109e+01, 1.49940586e+02, 2.49900900e+02, ...,
            9.96751812e+04, 9.97750661e+04, 9.98749509e+04],
           [4.99645306e+01, 1.49893546e+02, 2.49822499e+02, ...,
            9.96439101e+04, 9.97437636e+04, 9.98436171e+04],
           [4.99335559e+01, 1.49800621e+02, 2.49667625e+02, ...,
            9.95821374e+04, 9.96819291e+04, 9.97817207e+04],
           ...,
           [4.99349195e+01, 1.49804712e+02, 2.49674443e+02, ...,
            9.95848567e+04, 9.96846511e+04, 9.97844454e+04],
           [4.99653480e+01, 1.49895998e+02, 2.49826585e+02, ...,
            9.96455402e+04, 9.97453954e+04, 9.98452505e+04],
           [4.99802738e+01, 1.49940775e+02, 2.49901214e+02, ...,
            9.96753066e+04, 9.97751916e+04, 9.98750766e+04]],
          shape=(360, 1000))

  • z
    (azimuth, range)
    float64
    100.8 103.4 ... 3.309e+03 3.313e+03

    standard_name :

    height_above_ground

    units :

    metre

    array([[ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           ...,
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169]], shape=(360, 1000))

  • gr
    (azimuth, range)
    float64
    49.98 149.9 ... 9.978e+04 9.988e+04

    standard_name :

    distance_from_radar

    units :

    metre

    array([[4.99827785e+01, 1.49947043e+02, 2.49911245e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827803e+01, 1.49947044e+02, 2.49911246e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827818e+01, 1.49947046e+02, 2.49911248e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           ...,
           [4.99827722e+01, 1.49947036e+02, 2.49911238e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827745e+01, 1.49947039e+02, 2.49911241e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827766e+01, 1.49947041e+02, 2.49911243e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04]],
          shape=(360, 1000))

  • rays
    (azimuth, range)
    float64
    0.5054 0.5054 ... 359.5 359.5

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([[  0.50537109,   0.50537109,   0.50537109, ...,   0.50537109,
              0.50537109,   0.50537109],
           [  1.52160645,   1.52160645,   1.52160645, ...,   1.52160645,
              1.52160645,   1.52160645],
           [  2.52685547,   2.52685547,   2.52685547, ...,   2.52685547,
              2.52685547,   2.52685547],
           ...,
           [357.5088501 , 357.5088501 , 357.5088501 , ..., 357.5088501 ,
            357.5088501 , 357.5088501 ],
           [358.51409912, 358.51409912, 358.51409912, ..., 358.51409912,
            358.51409912, 358.51409912],
           [359.50286865, 359.50286865, 359.50286865, ..., 359.50286865,
            359.50286865, 359.50286865]], shape=(360, 1000))

  • bins
    (azimuth, range)
    float32
    50.0 150.0 ... 9.985e+04 9.995e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    100.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    50.0

    array([[5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           ...,
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04]], shape=(360, 1000), dtype=float32)

  • sweep_mode
    ()
    <U20
    'azimuth_surveillance'

    array('azimuth_surveillance', dtype='<U20')

  • longitude
    ()
    float64
    7.072

    long_name :

    longitude

    units :

    degrees_east

    standard_name :

    longitude

    array(7.071663)

  • latitude
    ()
    float64
    50.73

    long_name :

    latitude

    units :

    degrees_north

    positive :

    up

    standard_name :

    latitude

    array(50.73052)

  • altitude
    ()
    float64
    99.5

    long_name :

    altitude

    units :

    meters

    standard_name :

    altitude

    array(99.5)

  • crs_wkt
    ()
    int64
    0

    crs_wkt :

    PROJCRS["AEQD centered at 50.73052N 7.071663E",BASEGEOGCRS["unknown",DATUM["World Geodetic System 1984",ELLIPSOID["WGS 84",6378137,298.257223563,LENGTHUNIT["metre",1]],ID["EPSG",6326]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8901]]],CONVERSION["unknown",METHOD["Azimuthal Equidistant",ID["EPSG",1125]],PARAMETER["Latitude of natural origin",50.73052,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",7.071663,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["False easting",0,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False northing",0,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1,ID["EPSG",9001]]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1,ID["EPSG",9001]]]]

    semi_major_axis :

    6378137.0

    semi_minor_axis :

    6356752.314245179

    inverse_flattening :

    298.257223563

    reference_ellipsoid_name :

    WGS 84

    longitude_of_prime_meridian :

    0.0

    prime_meridian_name :

    Greenwich

    geographic_crs_name :

    unknown

    horizontal_datum_name :

    World Geodetic System 1984

    projected_crs_name :

    AEQD centered at 50.73052N 7.071663E

    grid_mapping_name :

    azimuthal_equidistant

    latitude_of_projection_origin :

    50.73052

    longitude_of_projection_origin :

    7.071663

    false_easting :

    0.0

    false_northing :

    0.0

    array(0)

• Data variables: (17)
  • KDP
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_specific_differential_phase_hv

    units :

    degrees per kilometer

    long_name :

    Specific differential phase HV

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • PHIDP
    (azimuth, range)
    float32
    ...

    format :

    UV16

    standard_name :

    radar_differential_phase_hv

    units :

    degrees

    long_name :

    Differential phase HV

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • DBZH
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_equivalent_reflectivity_factor_h

    units :

    dBZ

    long_name :

    Equivalent reflectivity factor H

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • DBZV
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_equivalent_reflectivity_factor_v

    units :

    dBZ

    long_name :

    Equivalent reflectivity factor V

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • RHOHV
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_correlation_coefficient_hv

    units :

    unitless

    long_name :

    Correlation coefficient HV

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • DBTH
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_equivalent_reflectivity_factor_h

    units :

    dBZ

    long_name :

    Total power H (uncorrected reflectivity)

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • DBTV
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_equivalent_reflectivity_factor_v

    units :

    dBZ

    long_name :

    Total power V (uncorrected reflectivity)

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • VRADH
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument_h

    units :

    meters per seconds

    long_name :

    Radial velocity of scatterers away from instrument H

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • VRADV
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radial_velocity_of_scatterers_away_from_instrument_v

    units :

    meters per second

    long_name :

    Radial velocity of scatterers away from instrument V

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • WRADH
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_doppler_spectrum_width_h

    units :

    meters per seconds

    long_name :

    Doppler spectrum width H

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • WRADV
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_doppler_spectrum_width_v

    units :

    meters per second

    long_name :

    Doppler spectrum width V

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • ZDR
    (azimuth, range)
    float32
    ...

    format :

    UV8

    standard_name :

    radar_differential_reflectivity_hv

    units :

    dB

    long_name :

    Log differential reflectivity H/V

    _Undetect :

    0.0

    [360000 values with dtype=float32]

  • sweep_number
    ()
    int64
    ...

    [1 values with dtype=int64]

  • prt_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • follow_mode
    ()
    <U7
    ...

    [1 values with dtype=<U7]

  • sweep_fixed_angle
    ()
    float64
    ...

    [1 values with dtype=float64]

  • nyquist_velocity
    ()
    object
    ...

    standard_name :

    nyquist_velocity

    units :

    m s-1

    [1 values with dtype=object]

• Attributes: (2)

  source :

  gamic

  pulse_width :

  2

Apply filter

clmap = swp.DBTH.wrl.classify.filter_gabella(
    wsize=5, thrsnorain=0.0, tr1=6.0, n_p=8, tr2=1.3
)
clmap

<xarray.DataArray 'filter_gabella' (azimuth: 360, range: 1000)> Size: 360kB
array([[False, False, False, ..., False, False, False],
       [False, False, False, ..., False, False, False],
       [False, False, False, ..., False, False, False],
       ...,
       [False, False, False, ..., False, False, False],
       [False, False, False, ..., False, False, False],
       [False, False, False, ..., False, False, False]], shape=(360, 1000))
Coordinates: (12/15)
  * azimuth     (azimuth) float64 3kB 0.5054 1.522 2.527 ... 357.5 358.5 359.5
    elevation   (azimuth) float64 3kB 1.505 1.505 1.505 ... 1.505 1.505 1.505
    time        (azimuth) datetime64[ns] 3kB ...
  * range       (range) float32 4kB 50.0 150.0 250.0 ... 9.985e+04 9.995e+04
    x           (azimuth, range) float64 3MB 0.4409 1.323 ... -865.7 -866.6
    y           (azimuth, range) float64 3MB 49.98 149.9 ... 9.978e+04 9.988e+04
    ...          ...
    bins        (azimuth, range) float32 1MB 50.0 150.0 ... 9.985e+04 9.995e+04
    sweep_mode  <U20 80B 'azimuth_surveillance'
    longitude   float64 8B 7.072
    latitude    float64 8B 50.73
    altitude    float64 8B 99.5
    crs_wkt     int64 8B 0
Attributes:
    standard_name:  clutter_map
    long_name:      Clutter Map
    short_name:     CMAP
    units:          unitless

xarray.DataArray

'filter_gabella'

• azimuth: 360
• range: 1000

• False False False False False False ... False False False False False

  array([[False, False, False, ..., False, False, False],
         [False, False, False, ..., False, False, False],
         [False, False, False, ..., False, False, False],
         ...,
         [False, False, False, ..., False, False, False],
         [False, False, False, ..., False, False, False],
         [False, False, False, ..., False, False, False]], shape=(360, 1000))

• Coordinates: (15)
  • azimuth
    (azimuth)
    float64
    0.5054 1.522 2.527 ... 358.5 359.5

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([  0.505371,   1.521606,   2.526855, ..., 357.50885 , 358.514099,
           359.502869], shape=(360,))

  • elevation
    (azimuth)
    float64
    1.505 1.505 1.505 ... 1.505 1.505

    standard_name :

    ray_elevation_angle

    long_name :

    elevation_angle_from_horizontal_plane

    units :

    degrees

    axis :

    radial_elevation_coordinate

    array([1.505127, 1.505127, 1.505127, ..., 1.505127, 1.505127, 1.505127],
          shape=(360,))

  • time
    (azimuth)
    datetime64[ns]
    ...

    standard_name :

    time

    [360 values with dtype=datetime64[ns]]

  • range
    (range)
    float32
    50.0 150.0 ... 9.985e+04 9.995e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    100.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    50.0

    array([5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04, 9.995e+04],
          shape=(1000,), dtype=float32)

  • x
    (azimuth, range)
    float64
    0.4409 1.323 ... -865.7 -866.6

    axis :

    X

    long_name :

    Easting

    standard_name :

    projection_x_coordinate

    units :

    metre

    array([[ 4.40856362e-01,  1.32256868e+00,  2.20428045e+00, ...,
             8.79196725e+02,  8.80077772e+02,  8.80958818e+02],
           [ 1.32722219e+00,  3.98166534e+00,  6.63610685e+00, ...,
             2.64686983e+03,  2.64952227e+03,  2.65217471e+03],
           [ 2.20359591e+00,  6.61078567e+00,  1.10179727e+01, ...,
             4.39461573e+03,  4.39901959e+03,  4.40342345e+03],
           ...,
           [-2.17247790e+00, -6.51743169e+00, -1.08623828e+01, ...,
            -4.33255731e+03, -4.33689899e+03, -4.34124066e+03],
           [-1.29608506e+00, -3.88825396e+00, -6.48042127e+00, ...,
            -2.58477326e+03, -2.58736347e+03, -2.58995368e+03],
           [-4.33668669e-01, -1.30100560e+00, -2.16834200e+00, ...,
            -8.64862358e+02, -8.65729041e+02, -8.66595722e+02]],
          shape=(360, 1000))

  • y
    (azimuth, range)
    float64
    49.98 149.9 ... 9.978e+04 9.988e+04

    axis :

    Y

    long_name :

    Northing

    standard_name :

    projection_y_coordinate

    units :

    metre

    array([[4.99802109e+01, 1.49940586e+02, 2.49900900e+02, ...,
            9.96751812e+04, 9.97750661e+04, 9.98749509e+04],
           [4.99645306e+01, 1.49893546e+02, 2.49822499e+02, ...,
            9.96439101e+04, 9.97437636e+04, 9.98436171e+04],
           [4.99335559e+01, 1.49800621e+02, 2.49667625e+02, ...,
            9.95821374e+04, 9.96819291e+04, 9.97817207e+04],
           ...,
           [4.99349195e+01, 1.49804712e+02, 2.49674443e+02, ...,
            9.95848567e+04, 9.96846511e+04, 9.97844454e+04],
           [4.99653480e+01, 1.49895998e+02, 2.49826585e+02, ...,
            9.96455402e+04, 9.97453954e+04, 9.98452505e+04],
           [4.99802738e+01, 1.49940775e+02, 2.49901214e+02, ...,
            9.96753066e+04, 9.97751916e+04, 9.98750766e+04]],
          shape=(360, 1000))

  • z
    (azimuth, range)
    float64
    100.8 103.4 ... 3.309e+03 3.313e+03

    standard_name :

    height_above_ground

    units :

    metre

    array([[ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           ...,
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169],
           [ 100.81346717,  103.44128457,  106.07027939, ..., 3305.14502024,
            3308.94609379, 3312.74837169]], shape=(360, 1000))

  • gr
    (azimuth, range)
    float64
    49.98 149.9 ... 9.978e+04 9.988e+04

    standard_name :

    distance_from_radar

    units :

    metre

    array([[4.99827785e+01, 1.49947043e+02, 2.49911245e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827803e+01, 1.49947044e+02, 2.49911246e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827818e+01, 1.49947046e+02, 2.49911248e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           ...,
           [4.99827722e+01, 1.49947036e+02, 2.49911238e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827745e+01, 1.49947039e+02, 2.49911241e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04],
           [4.99827766e+01, 1.49947041e+02, 2.49911243e+02, ...,
            9.96790593e+04, 9.97789481e+04, 9.98788368e+04]],
          shape=(360, 1000))

  • rays
    (azimuth, range)
    float64
    0.5054 0.5054 ... 359.5 359.5

    standard_name :

    ray_azimuth_angle

    long_name :

    azimuth_angle_from_true_north

    units :

    degrees

    axis :

    radial_azimuth_coordinate

    array([[  0.50537109,   0.50537109,   0.50537109, ...,   0.50537109,
              0.50537109,   0.50537109],
           [  1.52160645,   1.52160645,   1.52160645, ...,   1.52160645,
              1.52160645,   1.52160645],
           [  2.52685547,   2.52685547,   2.52685547, ...,   2.52685547,
              2.52685547,   2.52685547],
           ...,
           [357.5088501 , 357.5088501 , 357.5088501 , ..., 357.5088501 ,
            357.5088501 , 357.5088501 ],
           [358.51409912, 358.51409912, 358.51409912, ..., 358.51409912,
            358.51409912, 358.51409912],
           [359.50286865, 359.50286865, 359.50286865, ..., 359.50286865,
            359.50286865, 359.50286865]], shape=(360, 1000))

  • bins
    (azimuth, range)
    float32
    50.0 150.0 ... 9.985e+04 9.995e+04

    units :

    meters

    standard_name :

    projection_range_coordinate

    long_name :

    range_to_measurement_volume

    axis :

    radial_range_coordinate

    meters_between_gates :

    100.0

    spacing_is_constant :

    true

    meters_to_center_of_first_gate :

    50.0

    array([[5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           ...,
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04],
           [5.000e+01, 1.500e+02, 2.500e+02, ..., 9.975e+04, 9.985e+04,
            9.995e+04]], shape=(360, 1000), dtype=float32)

  • sweep_mode
    ()
    <U20
    'azimuth_surveillance'

    array('azimuth_surveillance', dtype='<U20')

  • longitude
    ()
    float64
    7.072

    long_name :

    longitude

    units :

    degrees_east

    standard_name :

    longitude

    array(7.071663)

  • latitude
    ()
    float64
    50.73

    long_name :

    latitude

    units :

    degrees_north

    positive :

    up

    standard_name :

    latitude

    array(50.73052)

  • altitude
    ()
    float64
    99.5

    long_name :

    altitude

    units :

    meters

    standard_name :

    altitude

    array(99.5)

  • crs_wkt
    ()
    int64
    0

    crs_wkt :

    PROJCRS["AEQD centered at 50.73052N 7.071663E",BASEGEOGCRS["unknown",DATUM["World Geodetic System 1984",ELLIPSOID["WGS 84",6378137,298.257223563,LENGTHUNIT["metre",1]],ID["EPSG",6326]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8901]]],CONVERSION["unknown",METHOD["Azimuthal Equidistant",ID["EPSG",1125]],PARAMETER["Latitude of natural origin",50.73052,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",7.071663,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["False easting",0,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False northing",0,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1,ID["EPSG",9001]]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1,ID["EPSG",9001]]]]

    semi_major_axis :

    6378137.0

    semi_minor_axis :

    6356752.314245179

    inverse_flattening :

    298.257223563

    reference_ellipsoid_name :

    WGS 84

    longitude_of_prime_meridian :

    0.0

    prime_meridian_name :

    Greenwich

    geographic_crs_name :

    unknown

    horizontal_datum_name :

    World Geodetic System 1984

    projected_crs_name :

    AEQD centered at 50.73052N 7.071663E

    grid_mapping_name :

    azimuthal_equidistant

    latitude_of_projection_origin :

    50.73052

    longitude_of_projection_origin :

    7.071663

    false_easting :

    0.0

    false_northing :

    0.0

    array(0)

• Attributes: (4)

  standard_name :

  clutter_map

  long_name :

  Clutter Map

  short_name :

  CMAP

  units :

  unitless

Plot results

fig = plt.figure(figsize=(12, 8))
ax1 = fig.add_subplot(121)
pm = swp.DBTH.wrl.vis.plot(ax=ax1)
ax1.set_title("Reflectivity")
ax2 = fig.add_subplot(122)
pm = clmap.wrl.vis.plot(ax=ax2)
ax2.set_title("Cluttermap")
fig.tight_layout()