Transect Lines for Assateague Island, Maryland and Virginia

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 several open-ocean shorelines, back-island shorelines, back-island shoreline points, sand area polygons, and sand lines for Assateague Island that were extracted from ortho imagery (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，对于明确保护周边生境与社区的湿地系统的恢复力至关重要。位于马里兰州与弗吉尼亚州的阿萨蒂格岛（Assateague Island），其湿地与后障岸线（back-barrier shorelines）因2012年10月29日登陆的飓风桑迪（Hurricane Sandy）引发的波浪作用与风暴潮发生了变化。本次研究将对飓风桑迪造成的影响进行评估，并将其置于历史背景中分析，以明晰湿地系统未来的脆弱性。
此类评估将依托从各类现势与历史资料中提取的数据，包括地图、航空摄影照片、卫星影像与激光雷达（lidar）高程数据，这些资料可记录随时间推移发生的物理变化。
本美国地质调查局（USGS）数据系列出版物包含了阿萨蒂格岛的多组开放洋岸线、后岛岸线、后岛岸线点、沙区多边形与沙线，这些数据提取自1989年4月12日至2013年9月5日期间的正射影像（ortho imagery，即正射航空摄影）。