Figure 4
From: Electromagnetic Model Reliably Predicts Radar Scattering Characteristics of Airborne Organisms
Simulated and observed bat emergence.
(A) Conceptual representation of an emergence column and subsequent dispersal of Brazilian free-tailed bats. (B) Mobile radar (NOXP) deployment near Frio Cave in Texas. (C) Values of radar reflectivity [dBη, decibel value of reflectivity relative to a reference value of 1 cm2 km−3] obtained during a bat emergence from Frio Cave on 10 July 2010 at 0134 UTC (2034 local time). The cave is denoted by a black dot north-northeast of the radar (origin). (D) Values of radial velocity [m s−1] corresponding to the data shown in (C). Red (green) colors indicate motion away from (towards) the radar. (E) Values of differential reflectivity [dB] corresponding to the data shown in (C). (F) Detail of the bat emergence signature in (E) with schematic bat orientations overlaid. (G) Calculated values of differential polarimetric RCS [dB] obtained from the anatomical bat model (red), ellipsoid bat model (black), and the corresponding measurements of ZDR (blue). The gray circle provides a 0-dB reference, with positive values outside and negative values within. Figure 4: Images in (A), (C), (D), (E), (F), and (G) were created using Matlab R2014a (http://www.mathworks.com/).
