Pseudo-color composite technique has widely used in satellite remote sensing applications. Polarimetric radar can give more measurements that make the use of color composite technique in radar possible. Based on three S-band polarimetric radar measurements (reflectivity factor Zh, differential reflectivity factor Zdr and linear depolarization radio LDR), a method for color composite is given. According their respective measure range, Zh, Zdr and LDR are scaled to 0~255 linearly as the RGB channel data to form RGB image. Comparing shows that within all the combinations, the image formed by LDR, Zh and Zdr as R, G, B channel respectively can take on more abundant information, which not only retains the reflectivity structure characters, but also implicates the properties of the polarimetric measurements from different colors, and has more comfortable visual effect. For different type of hydrometeors, composite color is calculated according to their radar measurements range, and the qualitative analysis show that there is distinct difference between each two colors of given hydrometeors type, which favors the visual distinguishing. Case studies based on RHI and PPI data show that reflectivity structures are retained in the composite image, and the distribution of hydrometeor types implicated form colors is reasonable. The types of radar echoes can be easily estimated from this composite image, and the proposed color composite technique can be used in polarimetric radar operational applications.
CHENG Zhoujie
,
WEI Ming
,
ZHU Yaping
,
LIU Xianxun
,
QI Linlin
,
NING Yinghui
. Pseudo-Color Composite for Polarimetric Radar[J]. Plateau Meteorology, 2014
, 33(5)
: 1448
-1456
.
DOI: 10.7522/j.issn.1000-0534.2013.00088
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