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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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Glm val tool overview

GLM Val ToolOverview

Monte Bateman


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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