This record is maintained as part of the marine systems collection. Read the documentation before using the files in a new analysis.这条记录属于海洋系统数据集。将文件用于新的分析前，请先阅读相关文档。
Why this dataset matters
This mosaic brings together sounding surveys, satellite-derived estimates and quality-controlled partner data into one continuous depth surface. It is designed for regional interpretation: identifying shelf breaks, sedimentary patterns and areas where the seafloor has changed between surveys.
Use it as a consistent spatial frame for coastal planning, habitat interpretation and exploratory modelling. The mosaic is not a navigational chart and should not be used for vessel safety or engineering decisions without checking the source survey.
Method
Input surveys were reprojected to geographic coordinates, checked for vertical datum compatibility and resampled to a 30 m output grid. Where multiple observations overlap, the most recent quality-controlled surface is preferred. The accompanying quality layer records the number of contributing surveys and the age of the best available observation.
Field guide
| Field | Description |
|---|---|
depth_m |
Estimated depth in metres below chart datum. |
survey_year |
Year of the source surface used at each cell. |
source_count |
Number of source observations contributing to the cell. |
quality_flag |
Review status for the local surface. |
Known limitations
The resolution is spatially consistent, but confidence is not. Intertidal areas and regions with sparse source coverage should be interpreted with the quality layer switched on. See the version notes in the download package for changes from v2.0.
数据集价值
这份镶嵌数据整合了测深调查、卫星反演结果和经过质量控制的合作方数据，形成连续的水深表面。它面向区域解读，可用于识别陆架边缘、沉积物分布特征，以及两次调查之间海床发生变化的区域。
你可以将它作为海岸规划、生境解读和探索性建模的一致空间参考。该镶嵌数据不是航海图，在船舶安全或工程决策中使用前，必须核查原始测量资料。
方法
输入调查数据被重投影到地理坐标系，经过垂直基准兼容性检查后重采样到 30 米输出网格。当多个观测发生重叠时，优先采用最近的、通过质量控制的表面。随附的质量图层记录了每个网格贡献的调查数量，以及最佳可用观测的年代。
字段指南
| 字段 | 描述 |
|---|---|
depth_m |
相对于海图基准面的估算深度，单位为米。 |
survey_year |
每个网格所使用源表面的调查年份。 |
source_count |
对该网格有贡献的源观测数量。 |
quality_flag |
局部表面的审核状态。 |
已知局限
数据的空间分辨率是一致的，但可信度并不相同。潮间带以及源数据覆盖稀疏的区域，应在开启质量图层后进行解读。v2.0 以来的变化请参阅下载包中的版本说明。
04 / ACCESS REQUEST04 / 数据申请
Request the data.申请数据。
Tell us who you are and how you plan to use this record. Every file in this dataset will be included in the request.请告诉我们你的身份以及使用这条记录的计划。本数据集中的全部文件都会包含在申请中。