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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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Presentation Transcript
introduction
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
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
how to validate glm
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
statistics fde
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
statistics fla
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
statistics fta
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
comparison study wwlln entln
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
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