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Enhancements in Single Polarization Clutter Mitigation Decision Techniques for NEXRAD

This presentation by Mike Dixon, John Hubbert, Greg Meymaris, and Scott Ellis examines improvements in Clutter Mitigation Decision (CMD) techniques, focusing on single polarization radar data analysis. Key topics include phasor diagrams, case studies from KEMX and KFTG, and the impact of clutter on reflectivity measurements. The findings show that modifications to the Clutter Profile Algorithm (CPA) can yield higher and smoother results for both clutter and weather detection. Ongoing tuning and testing are recommended to optimize these enhancements.

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Enhancements in Single Polarization Clutter Mitigation Decision Techniques for NEXRAD

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  1. CLUTTER MITIGATION DECISION (CMD)INVESTIGATION OF IMPROVEMENTSFOR SINGLE POLARIZATION CMD Mike Dixon, John Hubbert, Greg Meymaris and Scott EllisNational Center for Atmospheric ResearchBoulder, Colorado Technical Interchange Meeting for NEXRAD enhancementsROC, NSSL, NCAR Boulder, CO June 2010

  2. Presentation overview • Phasor diagrams • KEMX example • KFTG low-angle tilt • KFTG high-angle tilt

  3. PHASOR DIAGRAMS - KEMX

  4. Example of phasor diagram - KEMX

  5. Example of phasor diagram - KEMX

  6. Example of phasor diagram - KEMX

  7. Example of phasor diagram - KEMX

  8. Example of phasor diagram - KEMX

  9. Example of phasor diagram - KEMX

  10. PHASOR DIAGRAMS - KFTG

  11. Example of phasor diagram - KFTG

  12. Example of phasor diagram - KFTG

  13. Example of phasor diagram - KFTG

  14. Example of phasor diagram - KFTG

  15. Example of phasor diagram - KFTG

  16. Example of phasor diagram - KFTG

  17. Example of phasor diagram - KFTG

  18. KEMX with new CPA

  19. KEMX – clutter - original vs. modified CPA Original CPA Modified CPA

  20. KEMX – clutter - original vs. modified CPA Original CPA Modified CPA

  21. KEMX – Reflectivity DBZ DBZ Filtered

  22. KEMX – TDBZ and SPIN TDBZ SPIN

  23. KEMX – CPA and CMD flag New CPA CMD flag

  24. KFTG low-level tilt

  25. Usual test case, 2006/10/26 KFTG, DBZ / VEL

  26. KFTG TDBZ and SPIN

  27. KFTG old and new CPA

  28. KFTG new CPA and CMD Flag

  29. KFTG filtered DBZ and VEL

  30. KFTG – unfiltered DBZ and VEL

  31. KFTG high-level weather tilt

  32. KFTG – high level tilt with weather

  33. KFTG – high level tilt CPA old and new

  34. KFTG – high level tilt CPA old and new

  35. KFTG – high level tilt with weather

  36. Conclusion – Improved CPA needs tuning and testing • Method: compute CPA using some fraction of the parts which yield a maximum value. • This leads to higher values of CPA and a generally smoother result. • In addition to being smoother, this version of CPA shows higher values in both clutter and weather. • Therefore, further tuning and testing is required.

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