Presentation Title

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

Session Title

Mapping and Data

Conference Track

Salish Sea Snapshots

Conference Name

Salish Sea Ecosystem Conference (2016 : Vancouver, B.C.)

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type of Presentation

Snapshot

Abstract

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.

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Language

English

Format

application/pdf

Type

Text

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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.