Single dish (GBT) conversion guide

from importlib.metadata import version
import os

try:
    import xradio

    print("XRADIO version", version("xradio"), "already installed.")
except ImportError as e:
    print(e)
    print("Installing XRADIO")

    os.system("pip install xradio")

    import xradio

    print("xradio version", version("xradio"), " installed.")

XRADIO version 1.1.12a0 already installed.

Download dataset

https://open-bitbucket.nrao.edu/projects/CASA/repos/casatestdata/browse/unittest/tclean/venus_ephem_test.ms

import toolviper

toolviper.utils.data.download(file="sdimaging.ms")

[2026-01-21 13:11:10,176]     INFO    viperlog:  Downloading from [cloudflare] ....

  Download List 
 ───────────────
  sdimaging.ms

[2026-01-21 13:11:10,179]     INFO    viperlog:  File exists: sdimaging.ms

Convert to Processing Set

from xradio.measurement_set import convert_msv2_to_processing_set

ms_file = "sdimaging.ms"

main_chunksize = {"time": 63}  # baseline, polarization
outfile = "sdimaging.ps.zarr"
convert_msv2_to_processing_set(
    in_file=ms_file,
    out_file=outfile,
    parallel_mode="none",
    persistence_mode='w',
    main_chunksize=main_chunksize,
)

[2026-01-21 13:11:11,120]     INFO    viperlog:  Updated partition scheme used: ['DATA_DESC_ID', 'OBS_MODE', 'OBSERVATION_ID']
[2026-01-21 13:11:11,122]     INFO    viperlog:  Number of partitions: 1
[2026-01-21 13:11:11,122]     INFO    viperlog:  OBSERVATION_ID [0], DDI [0], STATE [0], FIELD [0], SCAN [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61], EPHEMERIS [None]
[2026-01-21 13:11:11,417]  WARNING    viperlog:  Doppler table present. Please open an issue on https://github.com/casangi/xradio/issues so that we can add support for this.

Processing Set

from xradio.measurement_set import open_processing_set

outfile = "sdimaging.ps.zarr"
ps_xdt = open_processing_set(ps_store=outfile)
ps_xdt.xr_ps.summary()

	name	scan_intents	shape	execution_block_UID	polarization	scan_name	spw_name	spw_intents	field_name	source_name	line_name	field_coords	session_reference_UID	scheduling_block_UID	project_UID	start_frequency	end_frequency
0	sdimaging_0	[OBSERVE_TARGET_ON_SOURCE, FREQUENCY_SWITCH_SIG]	(3843, 1, 1024, 2)	---	[XX, YY]	[1, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 2,...	spw_0	[UNSPECIFIED]	[FLS3a_0]	[FLS3a_0]	[]	[fk5, 0h00m00.00s, 0d00m00.00s]	---	---		1.419395e+09	1.421893e+09

ms_xdt = ps_xdt["sdimaging_0"]
ms_xdt

<xarray.DataTree 'sdimaging_0'>
Group: /sdimaging_0
│   Dimensions:                     (time: 3843, antenna_name: 1, frequency: 1024,
│                                    polarization: 2)
│   Coordinates:
│     * time                        (time) float64 31kB 1.069e+09 ... 1.069e+09
│     * antenna_name                (antenna_name) <U3 12B 'GBT'
│     * frequency                   (frequency) float64 8kB 1.419e+09 ... 1.422e+09
│     * polarization                (polarization) <U2 16B 'XX' 'YY'
│       field_name                  (time) <U27 415kB dask.array<chunksize=(1922,), meta=np.ndarray>
│       scan_name                   (time) <U21 323kB dask.array<chunksize=(1922,), meta=np.ndarray>
│       telescope_name              (antenna_name) <U3 12B dask.array<chunksize=(1,), meta=np.ndarray>
│   Data variables:
│       EFFECTIVE_INTEGRATION_TIME  (time, antenna_name) float64 31kB dask.array<chunksize=(63, 1), meta=np.ndarray>
│       FLAG                        (time, antenna_name, frequency, polarization) bool 8MB dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>
│       SPECTRUM                    (time, antenna_name, frequency, polarization) float32 31MB dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>
│       TIME_CENTROID               (time, antenna_name) float64 31kB dask.array<chunksize=(63, 1), meta=np.ndarray>
│       WEIGHT                      (time, antenna_name, frequency, polarization) float32 31MB dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>
│   Attributes:
│       creation_date:     2026-01-21T18:11:11.140206+00:00
│       creator:           {'software_name': 'xradio', 'version': '1.1.12a0'}
│       data_groups:       {'base': {'correlated_data': 'SPECTRUM', 'date': '2026...
│       observation_info:  {'observer': ['AGBT02A_031_12'], 'observing_log': '[]'...
│       processor_info:    {'sub_type': '', 'type': ''}
│       schema_version:    4.0.0
│       type:              spectrum
├── Group: /sdimaging_0/antenna_xds
│       Dimensions:                 (antenna_name: 1, cartesian_pos_label: 3,
│                                    receptor_label: 2)
│       Coordinates:
│         * cartesian_pos_label     (cartesian_pos_label) <U1 12B 'x' 'y' 'z'
│         * receptor_label          (receptor_label) <U5 40B 'pol_0' 'pol_1'
│           mount                   (antenna_name) <U6 24B dask.array<chunksize=(1,), meta=np.ndarray>
│           polarization_type       (antenna_name, receptor_label) <U1 8B dask.array<chunksize=(1, 2), meta=np.ndarray>
│           station_name            (antenna_name) <U9 36B dask.array<chunksize=(1,), meta=np.ndarray>
│           telescope_name          (antenna_name) <U3 12B dask.array<chunksize=(1,), meta=np.ndarray>
│       Data variables:
│           ANTENNA_DISH_DIAMETER   (antenna_name) float64 8B dask.array<chunksize=(1,), meta=np.ndarray>
│           ANTENNA_POSITION        (antenna_name, cartesian_pos_label) float64 24B dask.array<chunksize=(1, 3), meta=np.ndarray>
│           ANTENNA_RECEPTOR_ANGLE  (antenna_name, receptor_label) float64 16B dask.array<chunksize=(1, 2), meta=np.ndarray>
│       Attributes:
│           overall_telescope_name:  GBT
│           relocatable_antennas:    False
│           type:                    antenna
├── Group: /sdimaging_0/field_and_source_base_xds
│       Dimensions:                           (field_name: 1, sky_dir_label: 2,
│                                              line_label: 1)
│       Coordinates:
│         * field_name                        (field_name) <U27 108B 'FLS3a_0'
│         * sky_dir_label                     (sky_dir_label) <U3 24B 'ra' 'dec'
│         * line_label                        (line_label) <U21 84B '0'
│           line_name                         (field_name, line_label) <U1 4B dask.array<chunksize=(1, 1), meta=np.ndarray>
│           source_name                       (field_name) <U27 108B dask.array<chunksize=(1,), meta=np.ndarray>
│       Data variables:
│           FIELD_REFERENCE_CENTER_DIRECTION  (field_name, sky_dir_label) float64 16B dask.array<chunksize=(1, 2), meta=np.ndarray>
│           LINE_REST_FREQUENCY               (field_name, line_label) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
│           LINE_SYSTEMIC_VELOCITY            (field_name, line_label) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
│           SOURCE_DIRECTION                  (field_name, sky_dir_label) float64 16B dask.array<chunksize=(1, 2), meta=np.ndarray>
│       Attributes:
│           type:     field_and_source
├── Group: /sdimaging_0/pointing_xds
│       Dimensions:              (time_pointing: 3843, antenna_name: 1,
│                                 local_sky_dir_label: 2)
│       Coordinates:
│         * time_pointing        (time_pointing) float64 31kB 1.069e+09 ... 1.069e+09
│         * local_sky_dir_label  (local_sky_dir_label) <U3 24B 'az' 'alt'
│       Data variables:
│           POINTING_BEAM        (time_pointing, antenna_name, local_sky_dir_label) float64 61kB dask.array<chunksize=(3843, 1, 2), meta=np.ndarray>
│       Attributes:
│           type:     pointing
├── Group: /sdimaging_0/system_calibration_xds
│       Dimensions:               (antenna_name: 1, time_system_cal: 3843,
│                                  receptor_label: 2, frequency_system_cal: 1)
│       Coordinates:
│         * time_system_cal       (time_system_cal) float64 31kB 1.069e+09 ... 1.069e+09
│         * receptor_label        (receptor_label) <U5 40B 'pol_0' 'pol_1'
│         * frequency_system_cal  (frequency_system_cal) int64 8B 0
│           antenna_id            (antenna_name) int32 4B dask.array<chunksize=(1,), meta=np.ndarray>
│           mount                 (antenna_name) <U6 24B dask.array<chunksize=(1,), meta=np.ndarray>
│           polarization_type     (antenna_name, receptor_label) <U1 8B dask.array<chunksize=(1, 2), meta=np.ndarray>
│           station_name          (antenna_name) <U9 36B dask.array<chunksize=(1,), meta=np.ndarray>
│           telescope_name        (antenna_name) <U3 12B dask.array<chunksize=(1,), meta=np.ndarray>
│       Data variables:
│           TCAL                  (antenna_name, time_system_cal, receptor_label, frequency_system_cal) float64 61kB dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>
│           TSYS                  (antenna_name, time_system_cal, receptor_label, frequency_system_cal) float64 61kB dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>
│       Attributes:
│           type:     system_calibration
└── Group: /sdimaging_0/weather_xds
        Dimensions:              (station_name: 1, time_weather: 1,
                                  cartesian_pos_label: 3)
        Coordinates:
          * station_name         (station_name) <U9 36B 'GREENBANK'
          * time_weather         (time_weather) float64 8B 1.069e+09
          * cartesian_pos_label  (cartesian_pos_label) <U1 12B 'x' 'y' 'z'
        Data variables:
            PRESSURE             (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
            REL_HUMIDITY         (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
            STATION_POSITION     (station_name, cartesian_pos_label) float64 24B dask.array<chunksize=(1, 3), meta=np.ndarray>
            TEMPERATURE          (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
            WIND_DIRECTION       (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
            WIND_SPEED           (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
        Attributes:
            type:     weather

xarray.DataTree

'sdimaging_0'

• Groups: (5)
  /sdimaging_0/antenna_xds

  • Dimensions:
    • time: 3843
    • antenna_name: 1
    • frequency: 1024
    • polarization: 2
    • cartesian_pos_label: 3
    • receptor_label: 2
  • Coordinates: (6)
    • cartesian_pos_label
      (cartesian_pos_label)
      <U1
      'x' 'y' 'z'

      array(['x', 'y', 'z'], dtype='<U1')

    • receptor_label
      (receptor_label)
      <U5
      'pol_0' 'pol_1'

      array(['pol_0', 'pol_1'], dtype='<U5')

    • mount
      (antenna_name)
      <U6
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 24 B 24 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

    • polarization_type
      (antenna_name, receptor_label)
      <U1
      dask.array<chunksize=(1, 2), meta=np.ndarray>

      Array Chunk Bytes 8 B 8 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type

    • station_name
      (antenna_name)
      <U9
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 36 B 36 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

    • telescope_name
      (antenna_name)
      <U3
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 12 B 12 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • Data variables: (3)
    • ANTENNA_DISH_DIAMETER
      (antenna_name)
      float64
      dask.array<chunksize=(1,), meta=np.ndarray>

      type :

      quantity

      units :

      m

      Array Chunk Bytes 8 B 8 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • ANTENNA_POSITION
      (antenna_name, cartesian_pos_label)
      float64
      dask.array<chunksize=(1, 3), meta=np.ndarray>

      coordinate_system :

      geocentric

      frame :

      ITRS

      origin_object_name :

      earth

      type :

      location

      units :

      m

      Array Chunk Bytes 24 B 24 B Shape (1, 3) (1, 3) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • ANTENNA_RECEPTOR_ANGLE
      (antenna_name, receptor_label)
      float64
      dask.array<chunksize=(1, 2), meta=np.ndarray>

      type :

      quantity

      units :

      rad

      Array Chunk Bytes 16 B 16 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • Attributes: (3)

    overall_telescope_name :

    GBT

    relocatable_antennas :

    False

    type :

    antenna

  /sdimaging_0/field_and_source_base_xds

  • Dimensions:
    • time: 3843
    • antenna_name: 1
    • frequency: 1024
    • polarization: 2
    • field_name: 1
    • sky_dir_label: 2
    • line_label: 1
  • Coordinates: (5)
    • field_name
      (field_name)
      <U27
      'FLS3a_0'

      array(['FLS3a_0'], dtype='<U27')

    • sky_dir_label
      (sky_dir_label)
      <U3
      'ra' 'dec'

      array(['ra', 'dec'], dtype='<U3')

    • line_label
      (line_label)
      <U21
      '0'

      array(['0'], dtype='<U21')

    • line_name
      (field_name, line_label)
      <U1
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      Array Chunk Bytes 4 B 4 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type

    • source_name
      (field_name)
      <U27
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 108 B 108 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • Data variables: (4)
    • FIELD_REFERENCE_CENTER_DIRECTION
      (field_name, sky_dir_label)
      float64
      dask.array<chunksize=(1, 2), meta=np.ndarray>

      frame :

      fk5

      type :

      sky_coord

      units :

      rad

      Array Chunk Bytes 16 B 16 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • LINE_REST_FREQUENCY
      (field_name, line_label)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      observer :

      lsrk

      type :

      spectral_coord

      units :

      Hz

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • LINE_SYSTEMIC_VELOCITY
      (field_name, line_label)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      m/s

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • SOURCE_DIRECTION
      (field_name, sky_dir_label)
      float64
      dask.array<chunksize=(1, 2), meta=np.ndarray>

      frame :

      fk5

      type :

      sky_coord

      units :

      rad

      Array Chunk Bytes 16 B 16 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • Attributes: (1)

    type :

    field_and_source

  /sdimaging_0/pointing_xds

  • Dimensions:
    • time: 3843
    • antenna_name: 1
    • frequency: 1024
    • polarization: 2
    • time_pointing: 3843
    • local_sky_dir_label: 2
  • Coordinates: (2)
    • time_pointing
      (time_pointing)
      float64
      1.069e+09 1.069e+09 ... 1.069e+09

      format :

      unix

      scale :

      utc

      type :

      time

      units :

      s

      array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,1.068687e+09, 1.068687e+09], shape=(3843,))

    • local_sky_dir_label
      (local_sky_dir_label)
      <U3
      'az' 'alt'

      array(['az', 'alt'], dtype='<U3')

  • Data variables: (1)
    • POINTING_BEAM
      (time_pointing, antenna_name, local_sky_dir_label)
      float64
      dask.array<chunksize=(3843, 1, 2), meta=np.ndarray>

      frame :

      fk5

      type :

      sky_coord

      units :

      rad

      Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (3843, 1, 2) (3843, 1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • Attributes: (1)

    type :

    pointing

  /sdimaging_0/system_calibration_xds

  • Dimensions:
    • time: 3843
    • antenna_name: 1
    • frequency: 1024
    • polarization: 2
    • time_system_cal: 3843
    • receptor_label: 2
    • frequency_system_cal: 1
  • Coordinates: (8)
    • time_system_cal
      (time_system_cal)
      float64
      1.069e+09 1.069e+09 ... 1.069e+09

      format :

      unix

      scale :

      utc

      type :

      time

      units :

      s

      array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,1.068687e+09, 1.068687e+09], shape=(3843,))

    • receptor_label
      (receptor_label)
      <U5
      'pol_0' 'pol_1'

      array(['pol_0', 'pol_1'], dtype='<U5')

    • frequency_system_cal
      (frequency_system_cal)
      int64
      0

      observer :

      lsrk

      type :

      spectral_coord

      units :

      Hz

      array([0])

    • antenna_id
      (antenna_name)
      int32
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 4 B 4 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type int32 numpy.ndarray

    • mount
      (antenna_name)
      <U6
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 24 B 24 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

    • polarization_type
      (antenna_name, receptor_label)
      <U1
      dask.array<chunksize=(1, 2), meta=np.ndarray>

      Array Chunk Bytes 8 B 8 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type

    • station_name
      (antenna_name)
      <U9
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 36 B 36 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

    • telescope_name
      (antenna_name)
      <U3
      dask.array<chunksize=(1,), meta=np.ndarray>

      Array Chunk Bytes 12 B 12 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • Data variables: (2)
    • TCAL
      (antenna_name, time_system_cal, receptor_label, frequency_system_cal)
      float64
      dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>

      type :

      quantity

      units :

      K

      Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (1, 3843, 2, 1) (1, 3843, 2, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • TSYS
      (antenna_name, time_system_cal, receptor_label, frequency_system_cal)
      float64
      dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>

      type :

      quantity

      units :

      K

      Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (1, 3843, 2, 1) (1, 3843, 2, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • Attributes: (1)

    type :

    system_calibration

  /sdimaging_0/weather_xds

  • Dimensions:
    • time: 3843
    • antenna_name: 1
    • frequency: 1024
    • polarization: 2
    • station_name: 1
    • time_weather: 1
    • cartesian_pos_label: 3
  • Coordinates: (3)
    • station_name
      (station_name)
      <U9
      'GREENBANK'

      array(['GREENBANK'], dtype='<U9')

    • time_weather
      (time_weather)
      float64
      1.069e+09

      format :

      unix

      scale :

      utc

      type :

      time_weather

      units :

      s

      array([1.068855e+09])

    • cartesian_pos_label
      (cartesian_pos_label)
      <U1
      'x' 'y' 'z'

      array(['x', 'y', 'z'], dtype='<U1')

  • Data variables: (6)
    • PRESSURE
      (station_name, time_weather)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      Pa

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • REL_HUMIDITY
      (station_name, time_weather)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      %

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • STATION_POSITION
      (station_name, cartesian_pos_label)
      float64
      dask.array<chunksize=(1, 3), meta=np.ndarray>

      coordinate_system :

      geocentric

      frame :

      ITRS

      origin_object_name :

      earth

      type :

      location

      units :

      m

      Array Chunk Bytes 24 B 24 B Shape (1, 3) (1, 3) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • TEMPERATURE
      (station_name, time_weather)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      K

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • WIND_DIRECTION
      (station_name, time_weather)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      rad

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

    • WIND_SPEED
      (station_name, time_weather)
      float64
      dask.array<chunksize=(1, 1), meta=np.ndarray>

      type :

      quantity

      units :

      m/s

      Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • Attributes: (1)

    type :

    weather

• Dimensions:
  • time: 3843
  • antenna_name: 1
  • frequency: 1024
  • polarization: 2
• Coordinates: (7)
  • time
    (time)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    integration_time :

    {'attrs': {'type': 'quantity', 'units': 's'}, 'data': 2.998272, 'dims': []}

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

  • antenna_name
    (antenna_name)
    <U3
    'GBT'

    array(['GBT'], dtype='<U3')

  • frequency
    (frequency)
    float64
    1.419e+09 1.419e+09 ... 1.422e+09

    channel_width :

    {'attrs': {'type': 'quantity', 'units': 'Hz'}, 'data': 2441.40625, 'dims': []}

    observer :

    lsrk

    reference_frequency :

    {'attrs': {'observer': 'lsrk', 'type': 'spectral_coord', 'units': 'Hz'}, 'data': 1419395135.037322, 'dims': []}

    spectral_window_intents :

    ['UNSPECIFIED']

    spectral_window_name :

    spw_0

    type :

    spectral_coord

    units :

    Hz

    array([1.419395e+09, 1.419398e+09, 1.419400e+09, ..., 1.421888e+09,
           1.421890e+09, 1.421893e+09], shape=(1024,))

  • polarization
    (polarization)
    <U2
    'XX' 'YY'

    array(['XX', 'YY'], dtype='<U2')

  • field_name
    (time)
    <U27
    dask.array<chunksize=(1922,), meta=np.ndarray>

    Array Chunk Bytes 405.32 kiB 202.71 kiB Shape (3843,) (1922,) Dask graph 2 chunks in 2 graph layers Data type

  • scan_name
    (time)
    <U21
    dask.array<chunksize=(1922,), meta=np.ndarray>

    scan_intents :

    ['OBSERVE_TARGET_ON_SOURCE', 'FREQUENCY_SWITCH_SIG']

    Array Chunk Bytes 315.25 kiB 157.66 kiB Shape (3843,) (1922,) Dask graph 2 chunks in 2 graph layers Data type

  • telescope_name
    (antenna_name)
    <U3
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 12 B 12 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

• Data variables: (5)
  • EFFECTIVE_INTEGRATION_TIME
    (time, antenna_name)
    float64
    dask.array<chunksize=(63, 1), meta=np.ndarray>

    type :

    quantity

    units :

    s

    Array Chunk Bytes 30.02 kiB 504 B Shape (3843, 1) (63, 1) Dask graph 61 chunks in 2 graph layers Data type float64 numpy.ndarray

  • FLAG
    (time, antenna_name, frequency, polarization)
    bool
    dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>

    Array Chunk Bytes 7.51 MiB 126.00 kiB Shape (3843, 1, 1024, 2) (63, 1, 1024, 2) Dask graph 61 chunks in 2 graph layers Data type bool numpy.ndarray

  • SPECTRUM
    (time, antenna_name, frequency, polarization)
    float32
    dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>

    units :

    Array Chunk Bytes 30.02 MiB 504.00 kiB Shape (3843, 1, 1024, 2) (63, 1, 1024, 2) Dask graph 61 chunks in 2 graph layers Data type float32 numpy.ndarray

  • TIME_CENTROID
    (time, antenna_name)
    float64
    dask.array<chunksize=(63, 1), meta=np.ndarray>

    format :

    unix

    scale :

    utc

    type :

    time

    units :

    s

    Array Chunk Bytes 30.02 kiB 504 B Shape (3843, 1) (63, 1) Dask graph 61 chunks in 2 graph layers Data type float64 numpy.ndarray

  • WEIGHT
    (time, antenna_name, frequency, polarization)
    float32
    dask.array<chunksize=(63, 1, 1024, 2), meta=np.ndarray>

    type :

    quanta

    units :

    unkown

    Array Chunk Bytes 30.02 MiB 504.00 kiB Shape (3843, 1, 1024, 2) (63, 1, 1024, 2) Dask graph 61 chunks in 2 graph layers Data type float32 numpy.ndarray

• Attributes: (7)

  creation_date :

  2026-01-21T18:11:11.140206+00:00

  creator :

  {'software_name': 'xradio', 'version': '1.1.12a0'}

  data_groups :

  {'base': {'correlated_data': 'SPECTRUM', 'date': '2026-01-21T18:11:11.267783+00:00', 'description': "Data group derived from the data column 'SPECTRUM' of an MSv2 converted to MSv4", 'field_and_source': 'field_and_source_base_xds', 'flag': 'FLAG', 'weight': 'WEIGHT'}}

  observation_info :

  {'observer': ['AGBT02A_031_12'], 'observing_log': '[]', 'project_UID': '', 'release_date': '1858-11-17T00:00:00.000000000'}

  processor_info :

  {'sub_type': '', 'type': ''}

  schema_version :

  4.0.0

  type :

  spectrum

ms_xdt.antenna_xds

<xarray.DataTree 'antenna_xds'>
Group: /sdimaging_0/antenna_xds
    Dimensions:                 (time: 3843, antenna_name: 1, frequency: 1024,
                                 polarization: 2, cartesian_pos_label: 3,
                                 receptor_label: 2)
    Coordinates:
      * cartesian_pos_label     (cartesian_pos_label) <U1 12B 'x' 'y' 'z'
      * receptor_label          (receptor_label) <U5 40B 'pol_0' 'pol_1'
        mount                   (antenna_name) <U6 24B dask.array<chunksize=(1,), meta=np.ndarray>
        polarization_type       (antenna_name, receptor_label) <U1 8B dask.array<chunksize=(1, 2), meta=np.ndarray>
        station_name            (antenna_name) <U9 36B dask.array<chunksize=(1,), meta=np.ndarray>
        telescope_name          (antenna_name) <U3 12B dask.array<chunksize=(1,), meta=np.ndarray>
    Inherited coordinates:
      * antenna_name            (antenna_name) <U3 12B 'GBT'
      * frequency               (frequency) float64 8kB 1.419e+09 ... 1.422e+09
      * polarization            (polarization) <U2 16B 'XX' 'YY'
      * time                    (time) float64 31kB 1.069e+09 ... 1.069e+09
    Data variables:
        ANTENNA_DISH_DIAMETER   (antenna_name) float64 8B dask.array<chunksize=(1,), meta=np.ndarray>
        ANTENNA_POSITION        (antenna_name, cartesian_pos_label) float64 24B dask.array<chunksize=(1, 3), meta=np.ndarray>
        ANTENNA_RECEPTOR_ANGLE  (antenna_name, receptor_label) float64 16B dask.array<chunksize=(1, 2), meta=np.ndarray>
    Attributes:
        overall_telescope_name:  GBT
        relocatable_antennas:    False
        type:                    antenna

xarray.DataTree

'antenna_xds'

• Dimensions:
  • time: 3843
  • antenna_name: 1
  • frequency: 1024
  • polarization: 2
  • cartesian_pos_label: 3
  • receptor_label: 2
• Coordinates: (6)
  • cartesian_pos_label
    (cartesian_pos_label)
    <U1
    'x' 'y' 'z'

    array(['x', 'y', 'z'], dtype='<U1')

  • receptor_label
    (receptor_label)
    <U5
    'pol_0' 'pol_1'

    array(['pol_0', 'pol_1'], dtype='<U5')

  • mount
    (antenna_name)
    <U6
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 24 B 24 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • polarization_type
    (antenna_name, receptor_label)
    <U1
    dask.array<chunksize=(1, 2), meta=np.ndarray>

    Array Chunk Bytes 8 B 8 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type

  • station_name
    (antenna_name)
    <U9
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 36 B 36 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • telescope_name
    (antenna_name)
    <U3
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 12 B 12 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

• Inherited coordinates: (4)
  • antenna_name
    (antenna_name)
    <U3
    'GBT'

    array(['GBT'], dtype='<U3')

  • frequency
    (frequency)
    float64
    1.419e+09 1.419e+09 ... 1.422e+09

    channel_width :

    {'attrs': {'type': 'quantity', 'units': 'Hz'}, 'data': 2441.40625, 'dims': []}

    observer :

    lsrk

    reference_frequency :

    {'attrs': {'observer': 'lsrk', 'type': 'spectral_coord', 'units': 'Hz'}, 'data': 1419395135.037322, 'dims': []}

    spectral_window_intents :

    ['UNSPECIFIED']

    spectral_window_name :

    spw_0

    type :

    spectral_coord

    units :

    Hz

    array([1.419395e+09, 1.419398e+09, 1.419400e+09, ..., 1.421888e+09,
           1.421890e+09, 1.421893e+09], shape=(1024,))

  • polarization
    (polarization)
    <U2
    'XX' 'YY'

    array(['XX', 'YY'], dtype='<U2')

  • time
    (time)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    integration_time :

    {'attrs': {'type': 'quantity', 'units': 's'}, 'data': 2.998272, 'dims': []}

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

• Data variables: (3)
  • ANTENNA_DISH_DIAMETER
    (antenna_name)
    float64
    dask.array<chunksize=(1,), meta=np.ndarray>

    type :

    quantity

    units :

    m

    Array Chunk Bytes 8 B 8 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • ANTENNA_POSITION
    (antenna_name, cartesian_pos_label)
    float64
    dask.array<chunksize=(1, 3), meta=np.ndarray>

    coordinate_system :

    geocentric

    frame :

    ITRS

    origin_object_name :

    earth

    type :

    location

    units :

    m

    Array Chunk Bytes 24 B 24 B Shape (1, 3) (1, 3) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • ANTENNA_RECEPTOR_ANGLE
    (antenna_name, receptor_label)
    float64
    dask.array<chunksize=(1, 2), meta=np.ndarray>

    type :

    quantity

    units :

    rad

    Array Chunk Bytes 16 B 16 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

• Attributes: (3)

  overall_telescope_name :

  GBT

  relocatable_antennas :

  False

  type :

  antenna

ms_xdt.weather_xds

<xarray.DataTree 'weather_xds'>
Group: /sdimaging_0/weather_xds
    Dimensions:              (time: 3843, antenna_name: 1, frequency: 1024,
                              polarization: 2, station_name: 1, time_weather: 1,
                              cartesian_pos_label: 3)
    Coordinates:
      * station_name         (station_name) <U9 36B 'GREENBANK'
      * time_weather         (time_weather) float64 8B 1.069e+09
      * cartesian_pos_label  (cartesian_pos_label) <U1 12B 'x' 'y' 'z'
    Inherited coordinates:
      * antenna_name         (antenna_name) <U3 12B 'GBT'
      * frequency            (frequency) float64 8kB 1.419e+09 ... 1.422e+09
      * polarization         (polarization) <U2 16B 'XX' 'YY'
      * time                 (time) float64 31kB 1.069e+09 1.069e+09 ... 1.069e+09
    Data variables:
        PRESSURE             (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
        REL_HUMIDITY         (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
        STATION_POSITION     (station_name, cartesian_pos_label) float64 24B dask.array<chunksize=(1, 3), meta=np.ndarray>
        TEMPERATURE          (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
        WIND_DIRECTION       (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
        WIND_SPEED           (station_name, time_weather) float64 8B dask.array<chunksize=(1, 1), meta=np.ndarray>
    Attributes:
        type:     weather

xarray.DataTree

'weather_xds'

• Dimensions:
  • time: 3843
  • antenna_name: 1
  • frequency: 1024
  • polarization: 2
  • station_name: 1
  • time_weather: 1
  • cartesian_pos_label: 3
• Coordinates: (3)
  • station_name
    (station_name)
    <U9
    'GREENBANK'

    array(['GREENBANK'], dtype='<U9')

  • time_weather
    (time_weather)
    float64
    1.069e+09

    format :

    unix

    scale :

    utc

    type :

    time_weather

    units :

    s

    array([1.068855e+09])

  • cartesian_pos_label
    (cartesian_pos_label)
    <U1
    'x' 'y' 'z'

    array(['x', 'y', 'z'], dtype='<U1')

• Inherited coordinates: (4)
  • antenna_name
    (antenna_name)
    <U3
    'GBT'

    array(['GBT'], dtype='<U3')

  • frequency
    (frequency)
    float64
    1.419e+09 1.419e+09 ... 1.422e+09

    channel_width :

    {'attrs': {'type': 'quantity', 'units': 'Hz'}, 'data': 2441.40625, 'dims': []}

    observer :

    lsrk

    reference_frequency :

    {'attrs': {'observer': 'lsrk', 'type': 'spectral_coord', 'units': 'Hz'}, 'data': 1419395135.037322, 'dims': []}

    spectral_window_intents :

    ['UNSPECIFIED']

    spectral_window_name :

    spw_0

    type :

    spectral_coord

    units :

    Hz

    array([1.419395e+09, 1.419398e+09, 1.419400e+09, ..., 1.421888e+09,
           1.421890e+09, 1.421893e+09], shape=(1024,))

  • polarization
    (polarization)
    <U2
    'XX' 'YY'

    array(['XX', 'YY'], dtype='<U2')

  • time
    (time)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    integration_time :

    {'attrs': {'type': 'quantity', 'units': 's'}, 'data': 2.998272, 'dims': []}

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

• Data variables: (6)
  • PRESSURE
    (station_name, time_weather)
    float64
    dask.array<chunksize=(1, 1), meta=np.ndarray>

    type :

    quantity

    units :

    Pa

    Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • REL_HUMIDITY
    (station_name, time_weather)
    float64
    dask.array<chunksize=(1, 1), meta=np.ndarray>

    type :

    quantity

    units :

    %

    Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • STATION_POSITION
    (station_name, cartesian_pos_label)
    float64
    dask.array<chunksize=(1, 3), meta=np.ndarray>

    coordinate_system :

    geocentric

    frame :

    ITRS

    origin_object_name :

    earth

    type :

    location

    units :

    m

    Array Chunk Bytes 24 B 24 B Shape (1, 3) (1, 3) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • TEMPERATURE
    (station_name, time_weather)
    float64
    dask.array<chunksize=(1, 1), meta=np.ndarray>

    type :

    quantity

    units :

    K

    Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • WIND_DIRECTION
    (station_name, time_weather)
    float64
    dask.array<chunksize=(1, 1), meta=np.ndarray>

    type :

    quantity

    units :

    rad

    Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • WIND_SPEED
    (station_name, time_weather)
    float64
    dask.array<chunksize=(1, 1), meta=np.ndarray>

    type :

    quantity

    units :

    m/s

    Array Chunk Bytes 8 B 8 B Shape (1, 1) (1, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

• Attributes: (1)

  type :

  weather

ms_xdt.system_calibration_xds

<xarray.DataTree 'system_calibration_xds'>
Group: /sdimaging_0/system_calibration_xds
    Dimensions:               (time: 3843, antenna_name: 1, frequency: 1024,
                               polarization: 2, time_system_cal: 3843,
                               receptor_label: 2, frequency_system_cal: 1)
    Coordinates:
      * time_system_cal       (time_system_cal) float64 31kB 1.069e+09 ... 1.069e+09
      * receptor_label        (receptor_label) <U5 40B 'pol_0' 'pol_1'
      * frequency_system_cal  (frequency_system_cal) int64 8B 0
        antenna_id            (antenna_name) int32 4B dask.array<chunksize=(1,), meta=np.ndarray>
        mount                 (antenna_name) <U6 24B dask.array<chunksize=(1,), meta=np.ndarray>
        polarization_type     (antenna_name, receptor_label) <U1 8B dask.array<chunksize=(1, 2), meta=np.ndarray>
        station_name          (antenna_name) <U9 36B dask.array<chunksize=(1,), meta=np.ndarray>
        telescope_name        (antenna_name) <U3 12B dask.array<chunksize=(1,), meta=np.ndarray>
    Inherited coordinates:
      * antenna_name          (antenna_name) <U3 12B 'GBT'
      * frequency             (frequency) float64 8kB 1.419e+09 ... 1.422e+09
      * polarization          (polarization) <U2 16B 'XX' 'YY'
      * time                  (time) float64 31kB 1.069e+09 1.069e+09 ... 1.069e+09
    Data variables:
        TCAL                  (antenna_name, time_system_cal, receptor_label, frequency_system_cal) float64 61kB dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>
        TSYS                  (antenna_name, time_system_cal, receptor_label, frequency_system_cal) float64 61kB dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>
    Attributes:
        type:     system_calibration

xarray.DataTree

'system_calibration_xds'

• Dimensions:
  • time: 3843
  • antenna_name: 1
  • frequency: 1024
  • polarization: 2
  • time_system_cal: 3843
  • receptor_label: 2
  • frequency_system_cal: 1
• Coordinates: (8)
  • time_system_cal
    (time_system_cal)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

  • receptor_label
    (receptor_label)
    <U5
    'pol_0' 'pol_1'

    array(['pol_0', 'pol_1'], dtype='<U5')

  • frequency_system_cal
    (frequency_system_cal)
    int64
    0

    observer :

    lsrk

    type :

    spectral_coord

    units :

    Hz

    array([0])

  • antenna_id
    (antenna_name)
    int32
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 4 B 4 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type int32 numpy.ndarray

  • mount
    (antenna_name)
    <U6
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 24 B 24 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • polarization_type
    (antenna_name, receptor_label)
    <U1
    dask.array<chunksize=(1, 2), meta=np.ndarray>

    Array Chunk Bytes 8 B 8 B Shape (1, 2) (1, 2) Dask graph 1 chunks in 2 graph layers Data type

  • station_name
    (antenna_name)
    <U9
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 36 B 36 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

  • telescope_name
    (antenna_name)
    <U3
    dask.array<chunksize=(1,), meta=np.ndarray>

    Array Chunk Bytes 12 B 12 B Shape (1,) (1,) Dask graph 1 chunks in 2 graph layers Data type

• Inherited coordinates: (4)
  • antenna_name
    (antenna_name)
    <U3
    'GBT'

    array(['GBT'], dtype='<U3')

  • frequency
    (frequency)
    float64
    1.419e+09 1.419e+09 ... 1.422e+09

    channel_width :

    {'attrs': {'type': 'quantity', 'units': 'Hz'}, 'data': 2441.40625, 'dims': []}

    observer :

    lsrk

    reference_frequency :

    {'attrs': {'observer': 'lsrk', 'type': 'spectral_coord', 'units': 'Hz'}, 'data': 1419395135.037322, 'dims': []}

    spectral_window_intents :

    ['UNSPECIFIED']

    spectral_window_name :

    spw_0

    type :

    spectral_coord

    units :

    Hz

    array([1.419395e+09, 1.419398e+09, 1.419400e+09, ..., 1.421888e+09,
           1.421890e+09, 1.421893e+09], shape=(1024,))

  • polarization
    (polarization)
    <U2
    'XX' 'YY'

    array(['XX', 'YY'], dtype='<U2')

  • time
    (time)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    integration_time :

    {'attrs': {'type': 'quantity', 'units': 's'}, 'data': 2.998272, 'dims': []}

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

• Data variables: (2)
  • TCAL
    (antenna_name, time_system_cal, receptor_label, frequency_system_cal)
    float64
    dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>

    type :

    quantity

    units :

    K

    Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (1, 3843, 2, 1) (1, 3843, 2, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

  • TSYS
    (antenna_name, time_system_cal, receptor_label, frequency_system_cal)
    float64
    dask.array<chunksize=(1, 3843, 2, 1), meta=np.ndarray>

    type :

    quantity

    units :

    K

    Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (1, 3843, 2, 1) (1, 3843, 2, 1) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

• Attributes: (1)

  type :

  system_calibration

ms_xdt.pointing_xds

<xarray.DataTree 'pointing_xds'>
Group: /sdimaging_0/pointing_xds
    Dimensions:              (time: 3843, antenna_name: 1, frequency: 1024,
                              polarization: 2, time_pointing: 3843,
                              local_sky_dir_label: 2)
    Coordinates:
      * time_pointing        (time_pointing) float64 31kB 1.069e+09 ... 1.069e+09
      * local_sky_dir_label  (local_sky_dir_label) <U3 24B 'az' 'alt'
    Inherited coordinates:
      * antenna_name         (antenna_name) <U3 12B 'GBT'
      * frequency            (frequency) float64 8kB 1.419e+09 ... 1.422e+09
      * polarization         (polarization) <U2 16B 'XX' 'YY'
      * time                 (time) float64 31kB 1.069e+09 1.069e+09 ... 1.069e+09
    Data variables:
        POINTING_BEAM        (time_pointing, antenna_name, local_sky_dir_label) float64 61kB dask.array<chunksize=(3843, 1, 2), meta=np.ndarray>
    Attributes:
        type:     pointing

xarray.DataTree

'pointing_xds'

• Dimensions:
  • time: 3843
  • antenna_name: 1
  • frequency: 1024
  • polarization: 2
  • time_pointing: 3843
  • local_sky_dir_label: 2
• Coordinates: (2)
  • time_pointing
    (time_pointing)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

  • local_sky_dir_label
    (local_sky_dir_label)
    <U3
    'az' 'alt'

    array(['az', 'alt'], dtype='<U3')

• Inherited coordinates: (4)
  • antenna_name
    (antenna_name)
    <U3
    'GBT'

    array(['GBT'], dtype='<U3')

  • frequency
    (frequency)
    float64
    1.419e+09 1.419e+09 ... 1.422e+09

    channel_width :

    {'attrs': {'type': 'quantity', 'units': 'Hz'}, 'data': 2441.40625, 'dims': []}

    observer :

    lsrk

    reference_frequency :

    {'attrs': {'observer': 'lsrk', 'type': 'spectral_coord', 'units': 'Hz'}, 'data': 1419395135.037322, 'dims': []}

    spectral_window_intents :

    ['UNSPECIFIED']

    spectral_window_name :

    spw_0

    type :

    spectral_coord

    units :

    Hz

    array([1.419395e+09, 1.419398e+09, 1.419400e+09, ..., 1.421888e+09,
           1.421890e+09, 1.421893e+09], shape=(1024,))

  • polarization
    (polarization)
    <U2
    'XX' 'YY'

    array(['XX', 'YY'], dtype='<U2')

  • time
    (time)
    float64
    1.069e+09 1.069e+09 ... 1.069e+09

    format :

    unix

    integration_time :

    {'attrs': {'type': 'quantity', 'units': 's'}, 'data': 2.998272, 'dims': []}

    scale :

    utc

    type :

    time

    units :

    s

    array([1.068675e+09, 1.068675e+09, 1.068675e+09, ..., 1.068687e+09,
           1.068687e+09, 1.068687e+09], shape=(3843,))

• Data variables: (1)
  • POINTING_BEAM
    (time_pointing, antenna_name, local_sky_dir_label)
    float64
    dask.array<chunksize=(3843, 1, 2), meta=np.ndarray>

    frame :

    fk5

    type :

    sky_coord

    units :

    rad

    Array Chunk Bytes 60.05 kiB 60.05 kiB Shape (3843, 1, 2) (3843, 1, 2) Dask graph 1 chunks in 2 graph layers Data type float64 numpy.ndarray

• Attributes: (1)

  type :

  pointing