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Evaluation of Bias Correction Method for Satellite-Based Rainfall Data

With the advances in remote sensing technology, satellite-based rainfall estimates are gaining attraction in the field of hydrology, particularly in rainfall-runoff modeling. Since estimates are affected by errors correction is required. In this study, we tested the high resolution National Oceanic...

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Autores principales: Bhatti, Haris Akram, Rientjes, Tom, Haile, Alemseged Tamiru, Habib, Emad, Verhoef, Wouter
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4934310/
https://www.ncbi.nlm.nih.gov/pubmed/27314363
http://dx.doi.org/10.3390/s16060884
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author Bhatti, Haris Akram
Rientjes, Tom
Haile, Alemseged Tamiru
Habib, Emad
Verhoef, Wouter
author_facet Bhatti, Haris Akram
Rientjes, Tom
Haile, Alemseged Tamiru
Habib, Emad
Verhoef, Wouter
author_sort Bhatti, Haris Akram
collection PubMed
description With the advances in remote sensing technology, satellite-based rainfall estimates are gaining attraction in the field of hydrology, particularly in rainfall-runoff modeling. Since estimates are affected by errors correction is required. In this study, we tested the high resolution National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Centre (CPC) morphing technique (CMORPH) satellite rainfall product (CMORPH) in the Gilgel Abbey catchment, Ethiopia. CMORPH data at 8 km-30 min resolution is aggregated to daily to match in-situ observations for the period 2003–2010. Study objectives are to assess bias of the satellite estimates, to identify optimum window size for application of bias correction and to test effectiveness of bias correction. Bias correction factors are calculated for moving window (MW) sizes and for sequential windows (SW’s) of 3, 5, 7, 9, …, 31 days with the aim to assess error distribution between the in-situ observations and CMORPH estimates. We tested forward, central and backward window (FW, CW and BW) schemes to assess the effect of time integration on accumulated rainfall. Accuracy of cumulative rainfall depth is assessed by Root Mean Squared Error (RMSE). To systematically correct all CMORPH estimates, station based bias factors are spatially interpolated to yield a bias factor map. Reliability of interpolation is assessed by cross validation. The uncorrected CMORPH rainfall images are multiplied by the interpolated bias map to result in bias corrected CMORPH estimates. Findings are evaluated by RMSE, correlation coefficient (r) and standard deviation (SD). Results showed existence of bias in the CMORPH rainfall. It is found that the 7 days SW approach performs best for bias correction of CMORPH rainfall. The outcome of this study showed the efficiency of our bias correction approach.
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spelling pubmed-49343102016-07-06 Evaluation of Bias Correction Method for Satellite-Based Rainfall Data Bhatti, Haris Akram Rientjes, Tom Haile, Alemseged Tamiru Habib, Emad Verhoef, Wouter Sensors (Basel) Article With the advances in remote sensing technology, satellite-based rainfall estimates are gaining attraction in the field of hydrology, particularly in rainfall-runoff modeling. Since estimates are affected by errors correction is required. In this study, we tested the high resolution National Oceanic and Atmospheric Administration’s (NOAA) Climate Prediction Centre (CPC) morphing technique (CMORPH) satellite rainfall product (CMORPH) in the Gilgel Abbey catchment, Ethiopia. CMORPH data at 8 km-30 min resolution is aggregated to daily to match in-situ observations for the period 2003–2010. Study objectives are to assess bias of the satellite estimates, to identify optimum window size for application of bias correction and to test effectiveness of bias correction. Bias correction factors are calculated for moving window (MW) sizes and for sequential windows (SW’s) of 3, 5, 7, 9, …, 31 days with the aim to assess error distribution between the in-situ observations and CMORPH estimates. We tested forward, central and backward window (FW, CW and BW) schemes to assess the effect of time integration on accumulated rainfall. Accuracy of cumulative rainfall depth is assessed by Root Mean Squared Error (RMSE). To systematically correct all CMORPH estimates, station based bias factors are spatially interpolated to yield a bias factor map. Reliability of interpolation is assessed by cross validation. The uncorrected CMORPH rainfall images are multiplied by the interpolated bias map to result in bias corrected CMORPH estimates. Findings are evaluated by RMSE, correlation coefficient (r) and standard deviation (SD). Results showed existence of bias in the CMORPH rainfall. It is found that the 7 days SW approach performs best for bias correction of CMORPH rainfall. The outcome of this study showed the efficiency of our bias correction approach. MDPI 2016-06-15 /pmc/articles/PMC4934310/ /pubmed/27314363 http://dx.doi.org/10.3390/s16060884 Text en © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bhatti, Haris Akram
Rientjes, Tom
Haile, Alemseged Tamiru
Habib, Emad
Verhoef, Wouter
Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title_full Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title_fullStr Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title_full_unstemmed Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title_short Evaluation of Bias Correction Method for Satellite-Based Rainfall Data
title_sort evaluation of bias correction method for satellite-based rainfall data
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4934310/
https://www.ncbi.nlm.nih.gov/pubmed/27314363
http://dx.doi.org/10.3390/s16060884
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