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Remote Sens. 2018, 10(6), 939; https://doi.org/10.3390/rs10060939

Satellite-Based Rainfall Retrieval: From Generalized Linear Models to Artificial Neural Networks

MeteoSwiss, via ai Monti 146, 6605 Locarno-Monti, Switzerland
Current address: Institute for Atmospheric and Climate Science, ETHZ, 8092 Zürich, Switzerland.
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Received: 16 May 2018 / Revised: 2 June 2018 / Accepted: 9 June 2018 / Published: 13 June 2018
(This article belongs to the Section Atmosphere Remote Sensing)
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Abstract

In this study, we develop and compare satellite rainfall retrievals based on generalized linear models and artificial neural networks. Both approaches are used in classification mode in a first step to identify the precipitating areas (precipitation detection) and in regression mode in a second step to estimate the rainfall intensity at the ground (rain rate). The input predictors are geostationary satellite infrared (IR) brightness temperatures and Satellite Application Facility (SAF) nowcasting products which consist of cloud properties, such as cloud top height and cloud type. Additionally, a set of auxiliary location-describing input variables is employed. The output predictand is the ground-based instantaneous rain rate provided by the European-scale radar composite OPERA, that was additionally quality-controlled. We compare our results to a precipitation product which uses a single infrared (IR) channel for the rainfall retrieval. Specifically, we choose the operational PR-OBS-3 hydrology SAF product as a representative example for this type of approach. With generalized linear models, we show that we are able to substantially improve in terms of hits by considering more IR channels and cloud property predictors. Furthermore, we demonstrate the added value of using artificial neural networks to further improve prediction skill by additionally reducing false alarms. In the rain rate estimation, the indirect relationship between surface rain rates and the cloud properties measurable with geostationary satellites limit the skill of all models, which leads to smooth predictions close to the mean rainfall intensity. Probability matching is explored as a tool to recover higher order statistics to obtain a more realistic rain rate distribution. View Full-Text
Keywords: MSG SEVIRI; geostationary satellite; OPERA radar composite; rainfall; precipitation detection; rain rate estimation; generalized linear models; artificial neural networks MSG SEVIRI; geostationary satellite; OPERA radar composite; rainfall; precipitation detection; rain rate estimation; generalized linear models; artificial neural networks
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Beusch, L.; Foresti, L.; Gabella, M.; Hamann, U. Satellite-Based Rainfall Retrieval: From Generalized Linear Models to Artificial Neural Networks. Remote Sens. 2018, 10, 939.

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