SOCAL_TRANSECTS_LT - Long-Term Shoreline Change Rates for Southern California Generated at a 50m Transect Spacing, 1852-1998

Rates of long-term and short-term shoreline change were generated in a GIS using the Digital Shoreline Analysis System (DSAS) version 3.0; An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2005-1304, Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Miller, T.M. The extension is designed to efficiently lead a user through the major steps of shoreline change analysis. This extension to ArcGIS 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).

本数据集的长、短期岸线变化速率通过地理信息系统（Geographic Information System, GIS）平台，借助数字岸线分析系统（Digital Shoreline Analysis System, DSAS）3.0版本计算得到；该工具为用于岸线变化计算的ArcGIS扩展模块，相关参考文献为美国地质调查局公开文件报告2005-1304，作者包括Thieler, E.R.、Himmelstoss, E.A.、Zichichi, J.L.与Miller, T.M.。该扩展模块旨在高效引导用户完成岸线变化分析的核心步骤。此ArcGIS扩展模块包含三大核心组件：一是定义岸线基线，二是沿海岸以用户自定义间隔生成正交断面，三是计算岸线变化速率，具体计算方法涵盖线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法（jackknife）。