GA_TRANSECTS_LT - Long-Term Shoreline Change Rates for Georgia Atlantic Coast, Generated at a 50m Transect Spacing, 1857-1999

Rates of long-term and short-term shoreline change were generated in a GIS with the Digital Shoreline Analysis System (DSAS) version 2.0, an ArcView extension developed by the USGS in cooperation with TPMC Environmental Services. The extension is designed to efficiently lead a user through the major steps of shoreline change analysis. This extension to ArcView contains three main components that define a baseline, generate orthogonal transects at a user-defined separation along the coast, and calculate rates of change (linear regression, endpoint rate, average of rates, average of endpoints, jackknife).本数据集依托地理信息系统（Geographic Information System，GIS），结合数字岸线分析系统（Digital Shoreline Analysis System，DSAS）2.0版本，生成了长期与短期岸线变化速率。该工具是由美国地质调查局（United States Geological Survey，USGS）与TPMC环境服务公司（TPMC Environmental Services）联合开发的ArcView扩展插件，旨在高效引导用户完成岸线变化分析的核心步骤。这款ArcView扩展插件包含三大核心组件：其一可划定基线，其二能沿海岸按照用户自定义的间距生成正交断面，其三可计算岸线变化速率，涵盖线性回归、端点速率、速率平均值、端点平均值以及刀切法（jackknife）五种分析方法。