Offshore baselines for Assateague Island, Maryland and Virginia (projected, UTM Zone 18 (NAD83))

Assessing the physical change to shorelines and wetlands is critical in determining the resiliency of wetland systems that protect adjacent habitat and communities. The wetland and back-barrier shorelines of Assateague Island, located in Maryland and Virginia, changed as a result of wave action and storm surge that occurred during Hurricane Sandy, which made landfall on October 29, 2012. The impact of Hurricane Sandy will be assessed and placed in its historical context to understand the future vulnerability of wetland systems.
Making these assessments will rely on data extracted from current and historical resources such as maps, aerial photographs, satellite imagery, and lidar elevation data, which document physical changes over time.
This USGS Data Series publication includes includes several open-ocean shorelines, back-island shorelines, back-island shoreline points, sand area polygons, and sand lines for Assateague Island that were extracted from orthoimagery (ortho aerial photography)dated from April 12, 1989 to September 5, 2013.

评估海岸线与湿地的物理变化，对于研判保护周边生境与社区的湿地系统的恢复力至关重要。坐落于马里兰州与弗吉尼亚州的阿萨蒂格岛的湿地与障后岸线（back-barrier shorelines），因2012年10月29日登陆的桑迪飓风引发的波浪作用与风暴潮发生了变化。本次研究将对桑迪飓风造成的影响进行评估，并将其置于历史背景下分析，以明晰湿地系统未来的脆弱性。
开展此类评估需依托从各类现势与历史资料中提取的数据，包括记录了随时间推移发生的物理变化的地图、航空摄影照片、卫星影像以及激光雷达高程数据（lidar elevation data）。
本美国地质调查局（USGS）数据系列出版物包含了多组阿萨蒂格岛的外海岸线、岛后岸线、岛后岸线点、沙区多边形以及沙线数据，这些数据均提取自1989年4月12日至2013年9月5日期间的正射影像（orthoimagery，即正交航空摄影）。