Development of a precipitation nowcasting algorithm based upon optical flow techniques
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| Title: | Development of a precipitation nowcasting algorithm based upon optical flow techniques |
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| Authors: | Bowler, Neill E. H.1 neill.bowler@metoffice.com, Pierce, Clive E.1 clive.pierce@metoffice.com, Seed, Alan2 a.seed@bom.gov.au |
| Source: | Journal of Hydrology. Mar2004, Vol. 288 Issue 1/2, p74. 18p. |
| Subjects: | Meteorological precipitation, Radar, Lagrange equations, Rainfall |
| Abstract: | A new advection-based nowcasting scheme for precipitation has been developed for the Gandolf system. The method employed removes the need to split the radar analysis into contiguous rain areas (CRA''s) and uses a smoothness constraint. Thus, it is similar to the Variational Echo Tracking approach. Optical flow ideas are used to diagnose the advection velocity of blocks within rain analyses, which involve the direct solution of the Lagrangian persistence equation. In block-based approaches, the radar analyses are partitioned a-priori and a CRA may be split over a number of blocks. This scheme is compared with the old Gandolf advection scheme, which is based on CRA''s, and the new scheme performs better-both in cases associated with severe flooding and over a continuous verification period of 3 months. The benefit is conjectured to be due mainly to the difficulty in unambiguously identifying CRA''s, which is particularly troublesome on small domains, such as the UK. Thus, it is concluded that block-based methods are likely to be superior to object-based methods in the majority of cases. [Copyright &y& Elsevier] |
| Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 12574452 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Development of a precipitation nowcasting algorithm based upon optical flow techniques – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bowler%2C+Neill+E%2E+H%2E%22">Bowler, Neill E. H.</searchLink><relatesTo>1</relatesTo><i> neill.bowler@metoffice.com</i><br /><searchLink fieldCode="AR" term="%22Pierce%2C+Clive+E%2E%22">Pierce, Clive E.</searchLink><relatesTo>1</relatesTo><i> clive.pierce@metoffice.com</i><br /><searchLink fieldCode="AR" term="%22Seed%2C+Alan%22">Seed, Alan</searchLink><relatesTo>2</relatesTo><i> a.seed@bom.gov.au</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Hydrology%22">Journal of Hydrology</searchLink>. Mar2004, Vol. 288 Issue 1/2, p74. 18p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Meteorological+precipitation%22">Meteorological precipitation</searchLink><br /><searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink><br /><searchLink fieldCode="DE" term="%22Lagrange+equations%22">Lagrange equations</searchLink><br /><searchLink fieldCode="DE" term="%22Rainfall%22">Rainfall</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: A new advection-based nowcasting scheme for precipitation has been developed for the Gandolf system. The method employed removes the need to split the radar analysis into contiguous rain areas (CRA''s) and uses a smoothness constraint. Thus, it is similar to the Variational Echo Tracking approach. Optical flow ideas are used to diagnose the advection velocity of blocks within rain analyses, which involve the direct solution of the Lagrangian persistence equation. In block-based approaches, the radar analyses are partitioned a-priori and a CRA may be split over a number of blocks. This scheme is compared with the old Gandolf advection scheme, which is based on CRA''s, and the new scheme performs better-both in cases associated with severe flooding and over a continuous verification period of 3 months. The benefit is conjectured to be due mainly to the difficulty in unambiguously identifying CRA''s, which is particularly troublesome on small domains, such as the UK. Thus, it is concluded that block-based methods are likely to be superior to object-based methods in the majority of cases. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1016/j.jhydrol.2003.11.011 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 18 StartPage: 74 Subjects: – SubjectFull: Meteorological precipitation Type: general – SubjectFull: Radar Type: general – SubjectFull: Lagrange equations Type: general – SubjectFull: Rainfall Type: general Titles: – TitleFull: Development of a precipitation nowcasting algorithm based upon optical flow techniques Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bowler, Neill E. H. – PersonEntity: Name: NameFull: Pierce, Clive E. – PersonEntity: Name: NameFull: Seed, Alan IsPartOfRelationships: – BibEntity: Dates: – D: 20 M: 03 Text: Mar2004 Type: published Y: 2004 Identifiers: – Type: issn-print Value: 00221694 Numbering: – Type: volume Value: 288 – Type: issue Value: 1/2 Titles: – TitleFull: Journal of Hydrology Type: main |
| ResultId | 1 |
