Color, color infrared, and water penetration aerial photographs at various scales were assessed for identification, mapping, and inventory of macroalgal vegetation along extensive shoreline of Georgia Strait in the north-east Pacific. Natural color proved to be the most useful for definition of submerged vegetation to depths of 7 m, while CIR and natural color together provided the best definition of above-water intertidal seaweed vegetation. Using both films, exposed under rarely occurring optimum weather and tide conditions, and with the aid of ground data, at total of 11 vegetation units were classified and mapped at a scale of 1/10,000. Boundaries of the vegetation unit containing a valuable red seaweed resource, Iridaea cordata, could be defined equally well at a scale of 1:10,000 as at 1:2,500. A ground truth program was designed which revealed a close relation between the aerially mapped I. cordata vegetation units and field-observed vegetation units. Air photography with complimentary ground data collection was found effective in establishing baseline data for seaweed resource use, management, and conservation, and will be of value in environmental impact assessment. /Author/

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  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Chiu, H-Y
    • Collins, W
  • Publication Date: 1978-4

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Filing Info

  • Accession Number: 00177301
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 29 1978 12:00AM