Shoreline change rates for the coast of Puerto Rico's main island calculated using the Digital Shoreline Analysis System version 5.1 (ver. 2.0, March 2023)
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The U.S. Geological Survey (USGS) maintains shoreline positions for the United States coasts from both older sources, such as aerial photographs or topographic...
美国地质调查局（U.S. Geological Survey, USGS）维护着美国海岸的海岸线位置数据，其数据源涵盖航空摄影、地形测绘等各类老旧历史资料……
