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GLM Val Tool Overview

GLM Val Tool Overview. Monte Bateman. Introduction. GLM is an optical instrument Closest analog is LIS Have several ground-based, 24x7 networks; all are RF sensors Comparison between RF & optical characteristics of lightning ?. Tool to Validate the GLM System.

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GLM Val Tool Overview

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  1. GLM Val ToolOverview Monte Bateman

  2. Introduction • GLM is an optical instrument • Closest analog is LIS • Have several ground-based, 24x7 networks; all are RF sensors • Comparison between RF & optical characteristics of lightning?

  3. Tool to Validate the GLM System • Compare with any other available lightning data • Model after RTMM • Display multiple data sets • Calculate, plot & track all statistics • Show trending • Flag problems

  4. How to Validate GLM? • “Game Changer” • Optical sensor; ground-based network are RF == different physics • LIS on TRMM (maybe); LIS on ISS (maybe) • Range/FOV:WWLLN has the range, but uniformly low DE ~10% • DE: NLDN/GLD360 has the range, but mainly sees ground flashes • DE: LMA has the DE, but is range-limited

  5. Statistics: FDE • Flash detection efficiency • Measure against what? • WWLLN is global, but only about 10% DE • NLDN sees about 80% of ground, 15% of cloud • ENTLN? more later... • LMA best DE, but range-limited • LMA probably the best candidate for FDE

  6. Statistics: FLA • Flash location accuracy • Same questions • GLM pixels are (on average) 9km x 9km • LMA has accuracy to a few hundred meters • LMA looks at different physics -- won't agree on what a flash is, let alone where it is • NLDN (GLD360?) probably the best candidate for FLA

  7. Statistics: FTA • Flash time accuracy • GLM integrates 2ms frames • LMA has timing accuracy to 100 ns, but again, different physics • LMA may work, but NLDN probably the best candidate for FTA

  8. Val Tool Map

  9. Comparison Study:WWLLN & ENTLN • Needed to fully characterize other networks • Compared with LIS, the best analog for GLM • Groups to strokes • Comparison methodology -- time/space window selection • Groups to strokes -- ended up being flash comparisons

  10. WWLLN Timeline Plot

  11. ENTLN Timeline Plot

  12. WWLLN Map

  13. ENTLN Map

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