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Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters
Includes bibliographical references (leaves 106-117).
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
| Published: |
Department of Oceanography
2014
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| _version_ | 1867613177315852288 |
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| access_status_str | Open Access |
| author | Robertson, Elisabeth |
| author2 | Bernard, Stewart |
| author_browse | Bernard, Stewart Robertson, Elisabeth |
| author_facet | Bernard, Stewart Robertson, Elisabeth |
| author_sort | Robertson, Elisabeth |
| collection | Thesis |
| description | Includes bibliographical references (leaves 106-117). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/9023 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:31:58.458Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2014 |
| publishDateRange | 2014 |
| publishDateSort | 2014 |
| publisher | Department of Oceanography |
| publisherStr | Department of Oceanography |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/9023 Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters Robertson, Elisabeth Bernard, Stewart Shillington, Frank Oceanography Includes bibliographical references (leaves 106-117). This study forms the first step towards a comprehensive ocean colour satellite validation strategy for the Southern Benguela region, and underlines the value of a statistical radiometric validation as a prerequisite to any geophysical validation exercise. A radiometric validation exercise was performed using co-incident MERIS RR data and in situ radiometer data from a mooring in the Southern Benguela near Lambert's Bay during the late summer bloom seasons of 2005 and 2006. The data are typified by very high biomass conditions. Sources of error associated with the in situ data are assessed and the magnitudes quantified. The satellite data is examined with particular reference to uncertainty derived from the atmospheric correction processes, which perform unreliably in many of the matchup instances. Results show that the accuracy of the atmospheric correction does not appear to be related to the in-water constituents and is more likely due to atmospheric variability or aerosol features that are not addressed in the models employed by the correction processes. It is also shown that while the radiometric data display a consistent bias in the red region of the spectrum, good correlation with the satellite measurements is observed here under high biomass conditions, underlining the importance of the red wavebands for coastal remote sensing. Recommendations towards the development of a comprehensive regional validation strategy include the establishment of low-cost measurement protocols for high biomass conditions, as well as further investigations into regional atmospheric variability to improve confidence in the atmospheric correction procedures. 2014-10-31T18:06:49Z 2014-10-31T18:06:49Z 2009 Master Thesis Masters MSc http://hdl.handle.net/11427/9023 eng application/pdf Department of Oceanography Faculty of Science University of Cape Town |
| spellingShingle | Oceanography Robertson, Elisabeth Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| thesis_degree_str | Master's |
| title | Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| title_full | Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| title_fullStr | Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| title_full_unstemmed | Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| title_short | Radiometric validation of multi-spectral ocean colour satellite data in high biomass Southern Benguela waters |
| title_sort | radiometric validation of multi spectral ocean colour satellite data in high biomass southern benguela waters |
| topic | Oceanography |
| url | http://hdl.handle.net/11427/9023 |
| work_keys_str_mv | AT robertsonelisabeth radiometricvalidationofmultispectraloceancoloursatellitedatainhighbiomasssouthernbenguelawaters |