Digital Earth Australia Coastlines

Background:Australia has a highly dynamic coastline of over 30,000 km, with over 85% of its population living within 50 km of the coast. This coastline is subject to a wide range of pressures, including extreme weather and climate, sea level rise and human development. Understanding how the coastline responds to these pressures is crucial to managing this region, from social, environmental and economic perspectives. What this product offers:Digital Earth Australia Coastlines is a continental dataset that includes annual shorelines and rates of coastal change along the entire Australian coastline from 1988 to the present. The product combines satellite data from Geoscience Australia's Digital Earth Australia program with tidal modelling to map the typical location of the coastline at mean sea level for each year. The product enables trends of coastal erosion and growth to be examined annually at both a local and continental scale, and for patterns of coastal change to be mapped historically and updated regularly as data continues to be acquired. This allows current rates of coastal change to be compared with that observed in previous years or decades. The ability to map shoreline positions for each year provides valuable insights into whether changes to our coastline are the result of particular events or actions, or a process of more gradual change over time. This information can enable scientists, managers and policy makers to assess impacts from the range of drivers impacting our coastlines and potentially assist planning and forecasting for future scenarios. Applications- Monitoring and mapping rates of coastal erosion along the Australian coastline - Prioritise and evaluate the impacts of local and regional coastal management based on historical coastline change - Modelling how coastlines respond to drivers of change, including extreme weather events, sea level rise or human development - Supporting geomorphological studies of how and why coastlines have changed across time

研究背景：澳大利亚拥有超30000公里的高度动态变化海岸线，全国超85%的人口居住在距海岸50公里范围内。该海岸线承受着多类压力，包括极端天气与气候事件、海平面上升以及人类开发活动。从社会、环境与经济维度出发，明确海岸线对各类压力的响应机制，对该沿海区域的管理工作至关重要。
本数据集产品提供的内容：数字地球澳大利亚海岸线（Digital Earth Australia Coastlines）是一套大陆级全域数据集，涵盖1988年至今澳大利亚全境海岸线的年度岸线数据与海岸变化速率。本数据集融合了澳大利亚地球科学局（Geoscience Australia）数字地球澳大利亚项目的卫星遥感数据与潮汐模型，用于绘制各年份平均海平面（mean sea level）下的典型岸线位置。该数据集支持在局部与大陆两个尺度上逐年分析海岸侵蚀与岸线扩张的变化趋势，并可对海岸变化模式进行历史回溯制图，且能随着后续新数据的持续获取定期更新。这一特性使得研究人员可将当前海岸变化速率与过往数年乃至数十年的观测结果进行对比分析。通过逐年绘制岸线位置的能力，该数据集可为判断海岸线变化是由特定事件、人类活动引发，还是长期渐进式变化过程所致提供宝贵的科学见解。相关数据可帮助科学家、管理者与政策制定者评估影响海岸线的各类驱动因素所带来的影响，并有望为未来海岸管理的规划与预测提供支撑。
应用场景：
- 监测并绘制澳大利亚海岸线的海岸侵蚀速率
- 基于历史岸线变化数据，优先评估并研判地方与区域海岸管理措施的影响
- 模拟海岸线对各类变化驱动因素的响应机制，包括极端天气事件、海平面上升或人类开发活动
- 支持关于海岸线随时间变化的方式与成因的地貌学（geomorphological）研究