NORCAL_INTERSECTS_LT - Long-Term Transect-Shoreline Intersection Points for Northern California Generated to Calculate Shoreline Change Rates

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).本研究依托地理信息系统（Geographic Information System, GIS），采用数字海岸线分析系统（Digital Shoreline Analysis System，DSAS）3.0版本生成了长、短期海岸线变化速率。该系统是一款用于计算海岸线变化的ArcGIS扩展工具，相关技术资料源自美国地质调查局2005-1304号公开文件报告，作者为Thieler, E.R.、Himmelstoss, E.A.、Zichichi, J.L.及Miller, T.M.。 该扩展工具旨在高效引导用户完成海岸线变化分析的核心步骤。这款ArcGIS扩展工具包含三大核心组件：一是划定基线，二是沿海岸以用户自定义间距生成正交断面，三是计算变化速率（包括线性回归、端点速率法、速率平均值、端点平均值法以及刀切法）。