1983 Digitized Shoreline for Breton Island, Louisiana (Geographic, NAD83)
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Shorelines were derived from the National High Altitude Photography (NHAP) program. The NHAP was coordinated by the U.S. Geological Survey as an interagency project...
海岸线数据源自国家高空摄影（National High Altitude Photography, NHAP）计划。该计划由美国地质调查局统筹协调，作为一项跨部门项目开展……
