Historical Shorelines for Puerto Rico from 1901 to 1987

The U.S. Geological Survey (USGS) maintains shoreline positions for the United States coasts from both older sources, such as aerial photos or topographic surveys, as...美国地质调查局（U.S. Geological Survey, USGS）维护着美国沿海区域的海岸线位置数据，其数据源包含航空照片、地形测量等较早期的资料，以及……