Kathy Powell
Langley Research Center
4 Papers
Kathy Powell is an academic researcher from Langley Research Center. The author has contributed to research in topics: Lidar & Poisson distribution. The author has an hindex of 4, co-authored 4 publications.
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Papers
The depolarization - attenuated backscatter relation: CALIPSO lidar measurements vs. theory
Yongxiang Hu,Mark A. Vaughan,Zhaoyan Liu,Bing Lin,Ping Yang,David Flittner,Bill Hunt,Ralph Kuehn,Jiangping Huang,Dong Wu,Sharon Rodier,Kathy Powell,Charles R. Trepte,David M. Winker +13 more
TL;DR: A high-backscatter, low-depolarization delta-gamma relationship observed for some ice clouds is shown to result primarily from horizontally oriented plates and implies a preferential lidar ratio - depolarization ratio relation in nature for ice cloud particles containing plates.
195
Estimating random errors due to shot noise in backscatter lidar observations
Zhaoyan Liu,William H. Hunt,Mark A. Vaughan,Chris A. Hostetler,Matthew J. McGill,Kathy Powell,David M. Winker,Yongxiang Hu +7 more
TL;DR: Using the noise scale factor to estimate random errors in lidar measurements due to shot noise provides a significant advantage over the conventional error estimation techniques, in that with the NSF, uncertainties can be reliably calculated from or for a single data sample.
Elevation information in tail (EIT) technique for lidar altimetry.
Yongxiang Hu,Kathy Powell,Mark A. Vaughan,Charles Tepte,Carl Weimer,Mike Beherenfeld,Stuart A. Young,David M. Winker,Chris A. Hostetler,William H. Hunt,Ralph Kuehn,David Flittner,Mike Cisewski,Gary G. Gibson,Bing Lin,David G. MacDonnell +15 more
TL;DR: A technique the authors refer to as Elevation Information in Tail (EIT) has been developed to provide improved lidar altimetry from CALIPSO lidar data and is applicable to other similar lidar systems with low-pass filters.
41
Laser pulse bidirectional reflectance from CALIPSO mission
Xiaomei Lu,Yongxiang Hu,Yuekui Yang,Mark A. Vaughan,Zhaoyan Liu,Sharon Rodier,William H. Hunt,Kathy Powell,Patricia L. Lucker,Charles R. Trepte +9 more
TL;DR: An innovative retrieval method is presented that translate the CALIOP land surface laser pulse returns into the surface bidirectional reflectance and column top-of-atmosphere bidirectionAL reflectance results provide unique information to complement existing MODIS standard data products and would have valuable applications for modellers.