VCMP Sites - Shoreline Timeseries

VCMP Sites - Shoreline TimeseriesThe Shoreline Timeseries dataset features short-term and long-term shorelines ranging from 1930 to 2023 across sites monitored by the Victorian Coastal Monitoring Program (VCMP) along Victoria's coastline, spatially represented as point data.Output products include 1m Digital Surface Models (DSM) and Orthophotos (vegetation is included in UAV data).- Vertical uncertainty for the output digital surface model (DSM) is estimated at 0.1 m. - The shoreline proxy is defined as the point at which each transect first intersect a given contour (m, AHD): 1.0 m AHD for open coasts and 0.5 m AHD for bay sites - Intersection points are joined alongshore to create a shoreline, noting the alongshore spacing (30-m) may be too low to define complex, small-scale features. - Assuming a beach face slope of 1-in-10, a 0.1 m vertical uncertainty in the survey DSM equates to cross-shore uncertainty of 1 m in shoreline position.Digital Earth Australia (DEA) coastlinesA mean annual mid-tide shoreline is extracted from satellite imagery using sub-pixel identification methods, for the period 1988 to 2021, at 30-m alongshore spacing (Bishop-Taylor et al., 2021). - DEA shorelines have an estimated uncertainty of 1-3 m, with a precision limit on shoreline trends of 0.31 m/yr, i.e., trends below this threshold are insignificant. - DEA have known issues around cliffed areas, leading to higher (unconstrained) uncertainty in some cliffed areas. DEA outputs in such areas should be treated with caution.Aerial Imagery ShorelinesAerial images are hosted and geo-rectified by DEECA's Coordinated Imagery Program. Based on control point checks by VCMP, newer images (approx. post-2000) are estimated to have horizontal uncertainty of 3-m or less. Older images (pre-2000) can have greater uncertainty, estimated at up to 10-m. Older images (

VCMP 站点——海岸时序数据集
本海岸时序数据集涵盖维多利亚海岸沿线由维多利亚海岸监测计划（Victorian Coastal Monitoring Program, VCMP）监测的所有站点的短期与长期岸线数据，时间跨度为1930年至2023年，空间上以点数据形式呈现。其产出产品包括1米分辨率的数字表面模型（Digital Surface Model, DSM）以及正射影像（无人机（Unmanned Aerial Vehicle, UAV）数据中包含植被信息）。
- 产出的数字表面模型（DSM）的垂直不确定性估计为0.1米。
- 岸线代理指标定义为每条断面首次与给定等高线（单位：米，澳大利亚高程基准（Australian Height Datum, AHD））相交的点位：开放海岸采用1.0米AHD，海湾站点采用0.5米AHD。
- 将交点沿岸线方向连接即可生成岸线，但需注意，30米的沿岸间距可能过小，无法准确表征复杂的小型地貌特征。
- 假设滩面坡度为1:10，则测量用DSM的0.1米垂直不确定性对应岸线位置的横岸不确定性为1米。

澳大利亚数字地球（Digital Earth Australia, DEA）岸线数据集
该数据集采用亚像素识别方法从卫星影像中提取1988年至2021年的年均中潮位岸线，沿岸间距为30米（Bishop-Taylor等人，2021）。
- DEA岸线的不确定性估计为1至3米，岸线趋势的精度限值为0.31米/年，即低于该阈值的趋势不具备统计学显著性。
- DEA岸线在崖岸区域存在已知缺陷，部分崖岸区域的不确定性更高（未受约束），因此需谨慎使用该区域的DEA产出数据。

航空影像岸线数据集
航空影像由澳大利亚气候与环境部（DEECA）的协同影像项目托管并完成地理校正。基于VCMP的控制点检查结果，2000年之后的较新影像的水平不确定性估计为3米及以下；2000年之前的老旧影像不确定性更高，最高可达10米。老旧影像（