Shorelines of the Eastern Chukchi Sea, Alaska coastal region (Point Barrow to Icy Cape) used in shoreline change analysis

This dataset includes shorelines from 65 years ranging from 1947 to 2012 for the north coast of Alaska between Point Barrow and Icy Cape. Shorelines were compiled from topographic survey sheets and Nautical Charts (T-sheet, Nautical Chart; National Oceanic and Atmospheric Administration (NOAA)), aerial orthophotographs (U.S. Geological Survey (USGS), National Aeronautics and Space Administration (NASA), satellite imagery (State of Alaska), and lidar elevation data (USGS). Historical shoreline positions serve as easily understood features that can be used to describe the movement of beaches through time. These data are used to calculate rates of shoreline change for the U.S. Geological Survey's National Assessment of Shoreline Change Project. Rates of long-term and short-term shoreline change were generated in a GIS using the Digital Shoreline Analysis System (DSAS) version 4.3. DSAS uses a measurement baseline method to calculate rate-of-change statistics. Transects are cast from the reference baseline to intersect each shoreline, establishing measurement points used to calculate shoreline change rates.

本数据集涵盖1947年至2012年共计65年的阿拉斯加北海岸巴罗角（Point Barrow）至冰角（Icy Cape）区域的海岸线数据。该数据集的海岸线信息整合自地形测量图与海图（含T型海图、标准海图，由美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）提供）、航空正射影像（由美国地质调查局（U.S. Geological Survey, USGS）、美国国家航空航天局（National Aeronautics and Space Administration, NASA）联合提供）、阿拉斯加州卫星影像，以及美国地质调查局（USGS）发布的激光雷达高程数据。历史海岸线点位是直观易懂的特征要素，可用于刻画海滩随时间的迁移变化。此类数据被用于计算美国地质调查局国家海岸线变化评估项目的海岸线变化速率。长期与短期海岸线变化速率通过地理信息系统（Geographic Information System, GIS）结合数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）4.3版本生成。DSAS采用测量基线法计算变化速率统计值：从参考基线生成断面线以与各海岸线相交，由此确立用于计算海岸线变化速率的测量点位。