GLM Val Tool Overview
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Transcript of GLM Val Tool Overview
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GLM Val ToolOverviewMonte Bateman
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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?
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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
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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
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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
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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
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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
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Val Tool Map
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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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WWLLN Timeline Plot
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ENTLN Timeline Plot
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WWLLN Map
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ENTLN Map