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Remote Sensing of Macrocystis with SPOT Imagery
Surface canopy of giant kelp exhibits high near infrared (NIR) reflectance SPOT imagery well suited to differentiate kelp
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Kelp Canopy Delineation
Utilizes the high NIR reflectance of kelp canopy 2 calculations performed on the atmospherically corrected image: principal components (PC) rotation and NDVI (Normalized Difference Vegetation Index) PC band 2 expresses variations in NIR reflectance Kelp covered pixels show high PC band 2 and NDVI values
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Canopy Delineation Process
PC band 2 image Kelp delineation SPOT 3,2,1 stretched image SPOT 3,2,1 image 3(NIR)/1(green) band ratio NDVI image
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Canopy Cover Validation
Normalized SPOT cover measurements compared with normalized high resolution 2004 CDFG aerial kelp survey y = 0.96x + 0 r2: 0.92 p: < 1*10-12
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SBC-LTER SCUBA Measurements of Frond Density and Biomass
Monthly SCUBA measurements of frond density and biomass made at Arroyo Quemado (AQUE), Arroyo Burro (ABUR), and Mohawk (MOHK) kelp beds.
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SBC-LTER SCUBA Measurements of Frond Density and Biomass
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Satellite Biomass Estimation
Normalized Difference Vegetation Index (NDVI) (NIR-RED) (NIR+RED) Calculated for areas of kelp cover LTER transect at Mohawk NDVI Transform
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NDVI Comparison with LTER SCUBA Measurements
y = 14.33x r2 = 0.48 p < 1*10-5 y = 14.17x
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Regional Kelp Biomass Maps
Created from biomass-NDVI regression Calculated by pixel, kelp patch, or administrative bed Beds (11/01/2006) : ~8,600 metric tons wet weight
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Arroyo Quemado Time Series 2006
02/09/2006 04/13/2006 06/04/2006 kg kg kg 08/15/2006 11/01/2006 12/23/2006 kg kg kg
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Arroyo Burro & Mohawk Time Series 2006
02/09/2006 04/13/2006 06/04/2006 0 kg 6281 kg 11200 kg 08/15/2006 11/01/2006 12/23/2006 kg kg 63300 kg
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