Width of back-barrier salt marshes on the coast of Virginia 2010

Backbarrier marsh widths observed from remote sensing of satellite imagery for each of the following islands: Smith, Myrtle, Ship Shoal, Wreck, Cobb, Hog, Paramore, Cedar, Metompkin, and Assawoman Islands. Backbarrier marsh is defined for the purposes of this dataset as those marshes that are connected in a straight line to the barrier island without being interrupted by open water (Open water does not include channels of widths less than 50m). ASTER satellite imagery used for this analysis was acquired from the USGS Global Visualization Viewer web portal (http://glovis.usgs.gov/) (Scene L1B_00305152004155804_2010120215, 2010). Measurements are made every 15m along shore-perpendicular transects. No measurements are made within 1,000m of island "tips" to avoid tidal inlet effects.本数据集通过卫星影像遥感观测获取以下各岛屿的岸后沼泽（Backbarrier marsh）宽度：史密斯岛（Smith Island）、默特尔岛（Myrtle Island）、希普舒尔岛（Ship Shoal Island）、雷克岛（Wreck Island）、科布岛（Cobb Island）、霍格岛（Hog Island）、帕拉莫尔岛（Paramore Island）、锡达岛（Cedar Island）、梅托姆金岛（Metompkin Island）以及阿萨沃曼岛（Assawoman Island）。本数据集所定义的岸后沼泽（Backbarrier marsh），指与障壁岛呈直线连通且未被开阔水域阻断的沼泽（此处开阔水域不包含宽度小于50米的水道）。本分析所用的ASTER卫星影像（ASTER）采集自美国地质调查局（USGS）全球可视化查看器网页门户（http://glovis.usgs.gov/），影像编号为L1B_00305152004155804_2010120215，采集年份为2010年。测量沿垂直于岸线的断面每15米进行一次。为规避潮汐水道的影响，在岛屿“尖端”1000米范围内不开展测量。