Type of Presentation

Snapshot

Session Title

Mapping and Data

Description

This study defined procedures for the use of satellite optical imagery, specifically WorldView-2 and SPOT 6, to map the canopy distribution of kelp Nereocystis leutkeana. The most accurate kelp map product attained was produced from the SPOT-6 image, with the selected variable set of principle component PC2 and PC3 after image preprocessing steps of georectification, atmospheric correction, masking of land and depth below 30 m, and the statistical image processing steps of principle components analysis and variable reduction. The comparison of the satellite derived kelp map with the in situ kelp survey showed the high effectiveness of the developed procedures. It is important to highlight the difficultly in comparing satellite derived kelp maps with in situ survey data given (1) the mobility of kelp beds at the surface with changing water depth and current direction throughout tidal cycles; (2) the fast growth rate of Nereocystis rapidly changing the standing crop of kelp between the time of image acquisition and the time of kelp survey; (3) locational error intrinsic in field surveys due to occasional human error, the accuracy level of the GPS.

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High resolution satellite imagery to map canopy distribution of kelp in the Salish Sea

2016SSEC

This study defined procedures for the use of satellite optical imagery, specifically WorldView-2 and SPOT 6, to map the canopy distribution of kelp Nereocystis leutkeana. The most accurate kelp map product attained was produced from the SPOT-6 image, with the selected variable set of principle component PC2 and PC3 after image preprocessing steps of georectification, atmospheric correction, masking of land and depth below 30 m, and the statistical image processing steps of principle components analysis and variable reduction. The comparison of the satellite derived kelp map with the in situ kelp survey showed the high effectiveness of the developed procedures. It is important to highlight the difficultly in comparing satellite derived kelp maps with in situ survey data given (1) the mobility of kelp beds at the surface with changing water depth and current direction throughout tidal cycles; (2) the fast growth rate of Nereocystis rapidly changing the standing crop of kelp between the time of image acquisition and the time of kelp survey; (3) locational error intrinsic in field surveys due to occasional human error, the accuracy level of the GPS.