Search Results for author: Georgia Papacharalampous

Found 17 papers, 0 papers with code

Uncertainty estimation in satellite precipitation interpolation with machine learning

no code implementations13 Nov 2023 Georgia Papacharalampous, Hristos Tyralis, Nikolaos Doulamis, Anastasios Doulamis

Compared to QR, LightGBM showed improved performance with respect to the quantile scoring rule by 11. 10%, followed by QRF (7. 96%), GRF (7. 44%), GBM (4. 64%) and QRNN (1. 73%).

Benchmarking Feature Importance +3

Ensemble learning for blending gridded satellite and gauge-measured precipitation data

no code implementations9 Jul 2023 Georgia Papacharalampous, Hristos Tyralis, Nikolaos Doulamis, Anastasios Doulamis

In this context, satellite precipitation and topography data are the predictor variables, and gauged-measured precipitation data are the dependent variables.

Ensemble Learning regression

Deep Huber quantile regression networks

no code implementations17 Jun 2023 Hristos Tyralis, Georgia Papacharalampous, Nilay Dogulu, Kwok P. Chun

The main idea is to train a deep learning algorithm with the Huber quantile regression function, which is consistent for the Huber quantile functional.

regression

Merging satellite and gauge-measured precipitation using LightGBM with an emphasis on extreme quantiles

no code implementations2 Feb 2023 Hristos Tyralis, Georgia Papacharalampous, Nikolaos Doulamis, Anastasios Doulamis

To improve precipitation estimates, machine learning is applied to merge rain gauge-based measurements and gridded satellite precipitation products.

Spatial Interpolation

Comparison of tree-based ensemble algorithms for merging satellite and earth-observed precipitation data at the daily time scale

no code implementations31 Dec 2022 Georgia Papacharalampous, Hristos Tyralis, Anastasios Doulamis, Nikolaos Doulamis

Still, information on which tree-based ensemble algorithm to select for correcting satellite precipitation products for the contiguous United States (US) at the daily time scale is missing from the literature.

Benchmarking regression

Comparison of machine learning algorithms for merging gridded satellite and earth-observed precipitation data

no code implementations17 Dec 2022 Georgia Papacharalampous, Hristos Tyralis, Anastasios Doulamis, Nikolaos Doulamis

To provide results that are generalizable and to contribute to the delivery of best practices, we here compare eight state-of-the-art machine learning algorithms in correcting satellite precipitation data for the entire contiguous United States and for a 15-year period.

regression

A review of predictive uncertainty estimation with machine learning

no code implementations17 Sep 2022 Hristos Tyralis, Georgia Papacharalampous

Predictions and forecasts of machine learning models should take the form of probability distributions, aiming to increase the quantity of information communicated to end users.

Additive models regression +2

A review of machine learning concepts and methods for addressing challenges in probabilistic hydrological post-processing and forecasting

no code implementations17 Jun 2022 Georgia Papacharalampous, Hristos Tyralis

Several machine learning concepts and methods are notably relevant towards addressing the major challenges of formalizing and optimizing probabilistic forecasting implementations, as well as the equally important challenge of identifying the most useful ones among these implementations.

BIG-bench Machine Learning

Features of the Earth's seasonal hydroclimate: Characterizations and comparisons across the Koppen-Geiger climates and across continents

no code implementations13 Apr 2022 Georgia Papacharalampous, Hristos Tyralis, Yannis Markonis, Petr Maca, Martin Hanel

Detailed feature investigations and comparisons across climates, continents and time series types can progress our understanding and modelling ability of the Earth's hydroclimate and its dynamics.

Time Series Time Series Analysis

Time series features for supporting hydrometeorological explorations and predictions in ungauged locations using large datasets

no code implementations13 Apr 2022 Georgia Papacharalampous, Hristos Tyralis

Precipitation and temperature features (e. g., the spectral entropy, seasonality strength and lag-1 autocorrelation of the precipitation time series, and the stability and trend strength of the temperature time series) were found to be useful predictors of many streamflow features.

regression Time Series +1

Hydroclimatic time series features at multiple time scales

no code implementations2 Dec 2021 Georgia Papacharalampous, Hristos Tyralis, Yannis Markonis, Martin Hanel

A comprehensive understanding of the behaviours of the various geophysical processes and an effective evaluation of time series (else referred to as "stochastic") simulation models require, among others, detailed investigations across temporal scales.

Time Series Time Series Clustering

Probabilistic water demand forecasting using quantile regression algorithms

no code implementations16 Apr 2021 Georgia Papacharalampous, Andreas Langousis

The results mostly favour the practical systems designed using the linear boosting algorithm, probably due to the presence of trends in the urban water flow time series.

regression Time Series +1

Boosting algorithms in energy research: A systematic review

no code implementations1 Apr 2020 Hristos Tyralis, Georgia Papacharalampous

Machine learning algorithms have been extensively exploited in energy research, due to their flexibility, automation and ability to handle big data.

BIG-bench Machine Learning

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