Results 161 to 170 of about 1,788,071 (189)

Improving the hydrometeor classification at ground level in Belgium

2022
<p>Taking place at the Royal Meteorological Institute of Belgium (RMIB), the ongoing 2-year PRECIP-TYPE project aims at improving the hydrometeor classification in Belgium through the use of dual-pol radar observations and Numerical Weather Prediction (NWP) model output.<strong> </strong>Combining these two ...
Sylvain Watelet, Laurent Delobbe, Maarten Reyniers   +2 more
openaire   +1 more source

Sensitivity of an automatic procedure for hydrometeor classification

IGARSS 2000. IEEE 2000 International Geoscience and Remote Sensing Symposium. Taking the Pulse of the Planet: The Role of Remote Sensing in Managing the Environment. Proceedings (Cat. No.00CH37120), 2002
The purpose of this paper is to present details of the meteorological radar algorithm for classification of hydrometeors and a methodology for sensitivity analysis to the various polarimetric variables used for classification. The classification algorithm described belongs to the "fuzzy logic" family.
D.S. Zmic, A. Ryzhkov, J. Straka, null Yidi Liu, J. Vivekanandan   +4 more
openaire   +1 more source

A Vision-Based Precipitation Sensor for Detection and Classification of Hydrometeors

IEEE Sensors Journal, 2016
Measuring precipitation is an important part of ground observations of the Earth’s atmosphere. Existing systems for this task focus mainly on the hydrometeors’ micro-structure (e.g., shape, size, and velocity), but seldom consider to classify them. This paper proposes a new vision-based system for precipitation observation and type recognition (POTR ...
Ying Ma, Pengli Ding, Qingyong Li, Weitao Lu, Jun Yang, Wen Yao   +5 more
openaire   +1 more source

A Bayesian approach for hydrometeor classification of polarimetric weather radar variables

IET International Conference on Radar Systems (Radar 2012), 2012
In this paper, hydrometeor type classification is studied using the observations of CP-2 polarimetric weather radar located in Brisbane, Australia. The problem is formulated in a Bayesian classification framework, where total ten bulk hydrometeor types are considered.
null Guang Wen, P.T. May, W. Moran, null Xuezhi Wang   +3 more
openaire   +1 more source

The Joint Polarization Experiment: Polarimetric Rainfall Measurements and Hydrometeor Classification

Bulletin of the American Meteorological Society, 2005
As part of the evolution and future enhancement of the Next Generation Weather Radars (NEXRAD), the National Severe Storms Laboratory recently upgraded the KOUN Weather Surveillance Radar-1988 Doppler (WSR-88D) to include a polarimetric capability. The proof of concept was tested in central Oklahoma during a 1-yr demonstration project referred to as ...
Alexander V. Ryzhkov, Terry J. Schuur, Donald W. Burgess, Pamela L. Heinselman, Scott E. Giangrande, Dusan S. Zrnic   +5 more
openaire   +1 more source

The pluviospectrometer: classification of falling hydrometeors via digital image processing

Atmospheric Research, 1994
Abstract Characteristic properties of precipitation as intensity, raindrop size distribution, velocity of raindrops and morphology of the hydrometeors (especially snow flakes) are important parameters for the atmospheric scavenging processes. In order to measure these parameters without any disturbance, optical methods are suitable.
Gerhard Frank, Thomas Härtl, Jochen Tschiersch   +2 more
openaire   +1 more source

Hydrometeor classification system using dual-polarization radar measurements

IEEE Workshop on Advances in Techniques for Analysis of Remotely Sensed Data, 2003, 2004
Hydrometeor classification system using fuzzy logic technique based on dual-polarization radar measurements is presented. In this study, five radar measurements (horizontal reflectivity, differential reflectivity, specific differential phase, correlation coefficient, and linear depolarization ratio), and height relating to environmental melting level ...
null Sanghun Lim, V. Chandrasekar
openaire   +1 more source

Automatic classification of hydrometeors based on polarimetric weather radar measurements

IEEE International Radar Conference, 2005., 2005
With the development of modern electron and computer techniques, the ability of weather radar detecting precipitation echo has been greatly improved. However, the improvement of the of echo detecting precision doesn't mean the improvement of quantitative precipitation estimates due to different distribution and type of precipitation particles as well ...
null JunWu Cao, null LiPing Liu
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Hydrometeor classification in convective clouds using cloud profiler data

2020
<p>In this contribution, we investigate hydrometeors and their distribution in thunderclouds. We classify 5 kinds of hydrometeors using data of a Ka-band cloud profiler (35 GHz) situated at the weather station Milešovka in Central Europe. The classification of hydrometeors is based on calculated vertical air velocity,
Jana Minářová, Zbyněk Sokol
openaire   +1 more source

Polarimetry-based hydrometeor classification from synthetic and measured radar observations for the evaluation of hydrometeor mixtures in numerical weather prediction models

2022
<p>Polarimetric weather radars provide the opportunity to derive spatially and temporally high-resolved hydrometeor distributions to evaluate the representation of hydrometeors in the operational Numerical Weather Prediction (NWP) model ICON-LAM of the German Weather Service (DWD).
Velibor Pejcic, Jana Mendrok, Ulrich Blahak, Silke Trömel   +3 more
openaire   +1 more source