MauiW_LT- Digital Shoreline Analysis System (DSAS) version 4.2 transects with long-term weighted linear regression rate calculations for the Maui West region from Ukumehame to Honolua, Hawaii.

Sandy ocean beaches are a popular recreational destination, often surrounded by communities containing valuable real estate. Development is on the rise despite the fact that coastal infrastructure is subjected to flooding and erosion. As a result, there is an increased demand for accurate information regarding past and present shoreline changes. To meet these national needs, the Coastal and Marine Geology Program of the U.S. Geological Survey (USGS) is compiling existing reliable historical shoreline data along open-ocean sandy shores of the conterminous United States and parts of Alaska and Hawaii under the National Assessment of Shoreline Change project.

There is no widely accepted standard for analyzing shoreline change. Existing shoreline data measurements and rate calculation methods vary from study to study and prevent combining results into state-wide or regional assessments. The impetus behind the National Assessment project was to develop a standardized method of measuring changes in shoreline position that is consistent from coast to coast. The goal was to facilitate the process of periodically and systematically updating the results in an internally consistent manner.

沙质滨海海滩是热门的休闲度假胜地，周边往往坐落着拥有高价值不动产的社区。尽管沿海基础设施面临洪涝与侵蚀威胁，滨海开发热度仍持续攀升。由此，社会对精准获取岸线历史与现状变化信息的需求日益增长。为满足这一国家层面的需求，美国地质调查局（U.S. Geological Survey, USGS）下属的海岸与海洋地质项目组，正依托《海岸线变化国家评估》项目，对美国本土以及阿拉斯加、夏威夷部分区域的开放洋域沙质岸线的现有可靠历史岸线数据进行汇编。

目前尚无被广泛认可的岸线变化分析标准。现有岸线数据的测量方式与岸线变化速率计算方法因研究而异，导致无法将不同研究的结果整合至州级或区域级评估中。开展本次国家评估项目的核心动因，正是研发一套跨海岸一致的标准化岸线位置变化测量方法。其目标是以内部统一的方式，定期、系统地更新岸线变化评估结果，简化这一更新流程。