A refresher on super resolution radar data
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A Refresher on Super-Resolution Radar Data. Audra Hennecke , Dave Beusterien. Base Data Resolution: Legacy vs. Super-Res. Base Reflectivity : Legacy Range Resolution: 1, 2, 4 km (0.54, 1.1, 2.2 nm) Azimuthal Resolution: 1.0 degree Super-Res Range Resolution: 0.25 km (0.13 nm)

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A Refresher on Super-Resolution Radar Data

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A refresher on super resolution radar data

A Refresher on Super-Resolution Radar Data

Audra Hennecke, Dave Beusterien


Base data resolution legacy vs super res

Base Data Resolution: Legacy vs. Super-Res

  • Base Reflectivity:

    • Legacy

      • Range Resolution: 1, 2, 4 km (0.54, 1.1, 2.2 nm)

      • Azimuthal Resolution: 1.0 degree

    • Super-Res

      • Range Resolution: 0.25 km (0.13 nm)

      • Azimuthal Resolution: 0.5 degree

  • Base Velocity:

    • Legacy

      • Range Resolution: 0.25, 0.50, 1km (0.13, 0.27, 0.54 nm)

      • Azimuthal Resolution: 1.0 degree

    • Super-Res

      • Range Resolution: 0.25 km (0.13 nm)

      • Azimuthal Resolution: 0.5 degree


Display ranges

Display Ranges

  • Base Reflectivity

    • Legacy and Super-Res:

      • Both available to 248 nm

  • Base Velocity

    • Legacy:

      • Available to 124 nm

    • Super-Res:

      • Available to 162 nm


Super res characteristics

Super-Res Characteristics

  • Available at lower elevation angles

  • Base data generated for only the Split Cut elevations of the VCPs

  • Retains the highest reflectivity value for display in courser resolutions; preserves important features

    • i.e. maximum reflectivity values in the cores of strong thunderstorms


A refresher on super resolution radar data

8-bit 1 deg azimuth Reflectivity product

Maximum range = 248 nm

Super-Res Reflectivity product

Maximum range = 248 nm

Source: WDTB DLOC Topic 5


Super res base data

Super-Res Base Data

  • Super-Res Base Data, compared to all the base reflectivity/velocity products:

    • Highest number of data levels (256)

    • Greatest range resolution (250 m, 0.13 nm)

    • Best azimuthal resolution (0.5 degree)

  • Base data signatures easier to discern when viewing these higher resolution base data products


Super res base data1

Super-Res Base Data

  • Two signal processing techniques used to produce Super-Res base data

    • Overlapping radials and windowing

  • Windowing process introduces more error in the base data estimate

    • Results in SR base products being visually noisier than legacy resolution base products

    • However, it supports visual detection of smaller scale features at longer ranges


Noisy super res base data

Noisy Super-Res Base Data

  • Most apparent with reflectivity (compared to legacy resolution)

    • 8 SR reflectivity bins for every 1 legacy resolution reflectivity bin

  • More apparent in areas of stratiform precipitation and low returned power

  • Not as apparent in convective areas when compared to stratiform precipitation


A refresher on super resolution radar data

Example of Noisiness for Convective Rainfall

Legacy Base Reflectivity Product

SR Base Reflectivity Product

Source: WDTB DLOC Topic 3


A refresher on super resolution radar data

Example of Noisiness for Stratiform Rainfall

Legacy Base Reflectivity Product

SR Base Reflectivity Product

Source: WDTB DLOC Topic 3


Super res base velocity

Super-Res Base Velocity

  • Range: 162 nm

  • 256 data levels

  • Important velocity features will more readily appear and look clearer with Super-Res products

  • Super-Res velocity magnitudes associated with important signatures may need to be adjusted

    • May show stronger velocity values than those normally associated with many velocity signatures in the 1 degree data.


Super res srm

Super-Res: SRM

  • 250 m (0.25 km, 0.13 nm) x 0.5 degree

  • Range: 162 nm

  • 256 data levels

  • Displays the highest resolution velocity data available from the radar out to 162 nm for the split cut elevation angles.


Super res srm1

Super-Res: SRM

  • High detail (spatially and in data magnitude) provides improved detection of TVSs, mesocyclones, microbursts, and boundaries.

  • Very useful for examining the velocity structure of fast moving storms (> 10kts)

    • Significant advantage compared to base velocity products of the same resolution


Super res storm scale features

Super-Res: Storm-Scale Features

  • Storm-scale features show up more often and more clearlyin Super-Res products.

    • BWERs, hook echoes, TBSSs, low-level boundaries, hail cores, mesocyclones, TVSs, inflow notches


Super res mesocyclone identification

Super-Res: Mesocyclone Identification

  • Super-res velocity data: typically easier to identify small-scale features, i.e. mesocyclones

  • Velocity magnitudes associated with these features may appear stronger because of the finer resolution in the azimuthal direction


A refresher on super resolution radar data

Source: WDTB DLOC Topic 5

Super-Res SRM

Legacy, 1 deg. Azimuth SRM

  • For Super-Res, the strongest velocities associated with the mesocyclone cover a smaller area.

  • Super-res image has a significantly stronger outbound component of the mesocyclone (+43 ktsvs+21 kts) .

  • Overall storm identification is enhanced.


Super res tvss

Super-Res: TVSs

  • Super-Res velocity: available on the lowest 2-3 elevation angles

    • Exactly where you would want to look for TVSs

  • Gate-to-gate shear will often have a greater magnitude in Super-Res data than indicated in the TVS definition.

    • Additional research is needed to understand the relationship between super-res gate-to-gate shear magnitudes and tornadic events.


A refresher on super resolution radar data

TVS graphic product; Super-Res 0.5 SRM

Source: WDTB DLOC Topic 5


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