NC_TRANSECTS_LT - Long-Term Shoreline Change Rates for North Carolina Atlantic Coast, Generated at a 50m Transect Spacing, 1849-1997

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).

研究团队通过地理信息系统（Geographic Information System，GIS），借助美国地质调查局（United States Geological Survey，USGS）与TPMC环境服务公司联合开发的ArcView扩展工具——数字岸线分析系统（Digital Shoreline Analysis System，DSAS）v2.0，生成了长期与短期岸线变化速率数据。
该扩展工具专为高效引导用户完成岸线变化分析的核心步骤而设计。
这款ArcView扩展工具包含三大核心功能模块：一是定义岸线基线，二是沿海岸以用户自定义的间距生成正交断面，三是计算岸线变化速率，涵盖线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法（jackknife）。