Conventional methods for measuring current velocities generally employ current meters suspended from buoys moored at specific locations within the area of interest. Observations of this type are expensive and difficult to obtain, and therefore only a skeletal network of observations ususally is made. For this reason, the National Ocean Survey (NOS) has, in selected areas, been combining photogrammetric methods with the conventional current-meter survey techniques to obtain a more highly detailed circulatory survey than would be feasible otherwise. The principal feature and advantage of the PHOtogrammetric CIrculatory Survey (PHOCIS) is that it can provide an instantaneous synoptic measurement of surface and subsurface currents over a large area. Efforts are being made to improve the accuracy of the photogrammetric method and to provide the capability for the acquisition of comprehensive offshore measurements. /Author/

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  • Supplemental Notes:
    • Presented at the Annual Convention, American Society of Photogrammetry, Washington, D.C., March 1975.
  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • KELLER, M
  • Publication Date: 1975-9

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Filing Info

  • Accession Number: 00127224
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM