Coastal Zone Management

November, 1981

Aerial Photo Bathymetry, Arctic

Modern aerial colour films provide an alternative for mapping shallow water contours and features. Aerial photo bathymetry preceeding hydrographic surveys can provide a preliminary map of the rocks, reefs and shallow areas and thus assist the hydrographer incompleting the survey in an efficient and extremely cost effective manner. The airphoto interpretation approach to coastal hydrography is based on the recognition of airphoto pattern elements and the elevation relationship of these pattern elements to chart datum. This data is usually supplemented by stereographic interpretation, field reconnaissance and depth profile sounding beyond the limit of depth penetration of the airphotos being used. A thorough knowledge of coastal processes - physical and biological - is a prerequisite for application of airphoto interpretation techniques. An interpreter, experienced in geomorphology supported by a coastal marine biologist and a hydrographic surveyor form the field and office study team.

The Arctic Aerial Photo Bathymetry Project was undertaken for the Canadian Hydrographic Services to evaluate the application of airphoto interpretation methods to shallow-water mapping in the Arctic. The study concluded that airphoto interpretation techniques have much to offer the coastal hydrographer. Recommendations were made and the techniques applied at Simpson Strait, Northwest Territories on the historic "North West Passage" of Canada.

© 2001, Hunter GIS