19 December 2008 Evaluating eight field and remote sensing approaches for mapping the benthos of three different coral reef environments in Fiji
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Abstract
Monitoring of coral reef environments require accurate, timely and relevant information on their composition and condition. These environments are challenging to map due to their variation in reef type, remoteness, extent, benthic cover composition and variable water clarities. This work evaluates the accuracy, cost and relevance of eight commonly used benthic cover mapping approaches applied in three different coral reef environments in Fiji. The eight mapping techniques varied in field data source (local knowledge, point and transect surveys), image data (Quickbird 2 and Landsat 5 TM), level of image correction (none or atmospheric) and processing approaches (delineation and supervised classification). The eight mapping approaches were assessed in terms of their: map accuracy; production time and cost. Qualitative assessment was carried out by map users representing the local marine monitoring agencies. These map assessments showed that users and producers preferred mapping approaches based on: supervised classification of Quickbird imagery integrated with a basic field data. This approach produced an accurate map within a short time; with low cost that suited the user's purpose. The findings from this work demonstrate how variations in coral reef environments, and map purpose and resources management requirements affected the user's selection of a suitable mapping approach.
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Chris Roelfsema, Stuart Phinn, "Evaluating eight field and remote sensing approaches for mapping the benthos of three different coral reef environments in Fiji", Proc. SPIE 7150, Remote Sensing of Inland, Coastal, and Oceanic Waters, 71500F (19 December 2008); doi: 10.1117/12.804806; https://doi.org/10.1117/12.804806
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