Kelp (ODFW)
This layer is a composite of several years of aerial kelp surveys off Oregon. A coastwide survey was conducted in 1990, reef-specific surveys at 5 south coast reefs (Blanco, Orford, Redfish, Humbug and Rogue reefs) were conducted for 4 years from 1996 – 1999, and a regional survey was conducted from Cape Arago south to the California border in 2010. Three distinct survey designs were implemented for acquiring kelp bed imagery over two decades of kelp surveys. The target species was bull kelp, Nereocystis luetkeana. In 1990, the kelp survey was contracted to Ecoscan Resources Data. Kelp beds were photographed with black and white near infrared slide film. Interpretation methods included the application of a 50 meter radius to account for plant growth, and plants within 100 meters of each other (within 100 meters of the 50 meter radius) were included in a kelp polygon. ODFW designed the kelp surveys for 5 south coast reefs from 1996-1999. Specifications were established that ensured continuity between years. Bergman Photographic, Inc was contracted to acquire the imagery. Kelp beds were photographed using infrared photographic print film. Kelp beds were delineated without the addition of a 50 meter radius around kelp beds as was done with the 1990 data. In Oregon, the giant kelp, Macrocystis sp. is found only at Cape Arago. Both the 1990 and 2010 surveys covered Cape Arago, however only the 1990 survey delineation canopy for the giant kelp. In 2010, digital multispectral imagery of kelp canopy in southern Oregon was acquired and gridded at 1m resolution. The geographic coverage of the aerial survey is from Cape Arago (located near Coos Bay) to the Oregon-California border.
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