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Algorithm to pick out ground

Algorithm to pick out ground. Mean counts, binned by range, Feb-April 2011 (ground removed). Normalized range counts by precipitation periods (ground removed). Mean counts binned by height, Feb-April 2011 (ground removed). Normalized height counts by precipitation periods. January 20-23, 2012.

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Algorithm to pick out ground

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  1. Algorithm to pick out ground

  2. Mean counts, binned by range, Feb-April 2011 (ground removed)

  3. Normalized range counts by precipitation periods (ground removed)

  4. Mean counts binned by height, Feb-April 2011 (ground removed)

  5. Normalized height counts by precipitation periods

  6. January 20-23, 2012

  7. February 12-16, 2012 The slope coefficient for the regression, 1.7e-5 cm/count,is an order of magnitude smaller than the slope coefficient from theJanuary storm, 2.3e-04 cm/count

  8. Slope coefficient summary

  9. Elaborating Ned's SOW: • NEXT THREE MONTHS • Literature review (NED w/ awareness/cognition Bert & Jeff): 2-6 WEEKS • What goes on with LiDAR in use already? (PD, ARO, NSF, ERDC) • Principle of operation of different types in use (e.g., polarization, intensity, do they count individual events?) • Do any count number densities of particles directly?  Indirectly? • What factors affect the size of snowflakes below clouds (e.g., intervening layers in the atmosphere, wind speed, humidity, temperature)? (PD, ARO, NSF, ERDC) • What does precipitation radar do (e.g., principle of operation)? (PD, ARO, NSF, ERDC) • Why does snowfall give radars problems? • Do radars offer a decent measure of mass of precipitation? • What state of the art do we see in measuring snowfall?  (PD, ARO, NSF, ERDC) • Different collectors and the collection efficiency problem • What do we consider actual precipitation (e.g., SWE on the ground)? • What other approaches exist to characterize snow particles in the air (e.g., drift meters)? • BIG QUESTIONS (NSF) • How much uncertainty exists in the mass balance of the great ice sheets (e.g., Greenland, Antarctica)? • How do we estimate precipitation? • How do we estimate sublimation? • Do we account for drift-induced sublimation?  How? • Data processing (Ned & Jeff) • Learn to export x,y,z, intensity, time (Ned) • Correlate raw counts in a volume, accumulated over several scans, with snow height accretion (Ned) • Do with data having atmosphere as background • Do with data having reflectors as a background • Evaluate the scatter in the scattergrams v. wind speed, etc. (Ned) • Begin to formulate sampling theory for a diverging beam (Ned & Jeff) • Formulate a hypothesis about what a count means (Jeff & Ned)

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