NC_BASELINE - Offshore Baseline for North Carolina Atlantic Coast Generated to Calculate Shoreline Change Rates

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).长、短期海岸岸线变化速率由美国地质调查局（United States Geological Survey, USGS）与TPMC环境服务公司联合开发的ArcView扩展模块——数字海岸分析系统（Digital Shoreline Analysis System, DSAS）2.0版，在地理信息系统（Geographic Information System, GIS）中生成。该扩展模块旨在引导用户高效完成岸线变化分析的核心流程步骤。这款ArcView扩展模块包含三大核心功能组件：分别实现岸线基线定义、沿海岸以用户指定间距生成正交断面，以及变化速率计算，支持线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法（jackknife）。