BA SYD 1 sec SRTM (h) DEM and hydrological derivatives

## **Abstract** \n\nThe dataset was derived by the Bioregional Assessment Programme from the Geoscience Australia, 1 second SRTM Digital Elevation Model (DEM) dataset. The source dataset is identified in the Lineage field in this metadata statement. The processes undertaken to produce this derived dataset are described in the History field in this metadata statement.\n\n\n\nThis data is an extract from the 1 second hydrologically enforced SRTM, clipped to a rectangle to take in the extent of the BA_SYD bioregion and its contributing subcatchments (BA_SYD_DEMh1sec). \n\n\n\nThe data is extracted from\n\nGeoscience Australia, 1 second SRTM Digital Elevation Model (DEM)\n\nGUID: 9a9284b6-eb45-4a13-97d0-91bf25f1187b\n\n\n\nThree additional layers are derived from this data for hydrological analysis and catchment delineation. They are:\n\nBA_SYD_DEMh1sec_fill: as above but with sinks filled\n\nBA_SYD_FDIR: Flow direction\n\nBA_SYD_FACC: Flow accumulation.\n\n## **Purpose** \n\nHydrological analysis and contribution catchment delineation\n\n## **Dataset History** \n\nThis data is an extract from the 1 second hydrologically enforced SRTM, clipped to a rectangle to take in the extent of the BA_SYD bioregion and its contributing subcatchments (BA_SYD_DEMh1sec). \n\n\n\nThe data is extracted from Geoscience Australia, 1 second SRTM Digital Elevation Model (DEM) using the Spatial Analyst "Extract by Rectangle" tool snapped to the source raster.\n\nGUID: 9a9284b6-eb45-4a13-97d0-91bf25f1187b \n\n\n\nThree additional layers are derived from the extracted DEM using the respective Tools in the ArcGIS Spatial Analyst-> Hydrology toolset. They are:\n\nBA_SYD_DEMh1sec_fill: as above but with sinks Filled\n\nBA_SYD_FDIR: Flow Direction\n\nBA_SYD_FACC: Flow Accumulation.\n\n## **Dataset Citation** \n\nBioregional Assessment Programme (2014) BA SYD 1 sec SRTM (h) DEM and hydrological derivatives. Bioregional Assessment Derived Dataset. Viewed 18 July 2018, http://data.bioregionalassessments.gov.au/dataset/90f5ef3c-2141-4450-b44c-1afbd843236f.\n\n## **Dataset Ancestors** \n\n* **Derived From** [Geoscience Australia, 1 second SRTM Digital Elevation Model (DEM)](https://data.gov.au/data/dataset/9a9284b6-eb45-4a13-97d0-91bf25f1187b)\n\n

**摘要**

本数据集由生物区域评估计划（Bioregional Assessment Programme）基于澳大利亚地质调查局（Geoscience Australia）的1秒分辨率SRTM数字高程模型（Digital Elevation Model, DEM）数据集衍生而来。源数据集的相关信息已在本元数据声明的“谱系（Lineage）”字段中注明，该衍生数据集的生成流程已在本元数据声明的“历史（History）”字段中详述。

本数据为经水文增强处理的1秒分辨率SRTM数据的裁剪子集，裁剪范围为覆盖BA_SYD生物区域及其汇水区子流域的矩形区域，对应图层为BA_SYD_DEMh1sec。

本数据提取自：

澳大利亚地质调查局（Geoscience Australia），1秒分辨率SRTM数字高程模型（Digital Elevation Model, DEM）

全局唯一标识符（Globally Unique Identifier, GUID）：9a9284b6-eb45-4a13-97d0-91bf25f1187b

此外，基于本数据还衍生出3个用于水文分析与流域划定的附加图层，分别为：

BA_SYD_DEMh1sec_fill：同上述基础图层，但已完成洼地填充

BA_SYD_FDIR：流向（Flow Direction）图层

BA_SYD_FACC：汇流累积量（Flow Accumulation）图层。

**用途**

用于水文分析与汇水区子流域划定

**数据集历史**

本数据为经水文增强处理的1秒分辨率SRTM数据的裁剪子集，裁剪范围为覆盖BA_SYD生物区域及其汇水区子流域的矩形区域，对应图层为BA_SYD_DEMh1sec。

本数据通过ArcGIS空间分析工具组的“按矩形提取（Extract by Rectangle）”工具从源栅格数据中提取，提取时已与源栅格对齐。

全局唯一标识符（Globally Unique Identifier, GUID）：9a9284b6-eb45-4a13-97d0-91bf25f1187b

基于提取得到的数字高程模型，通过ArcGIS Spatial Analyst->水文分析工具组（Hydrology toolset）中的对应工具，进一步衍生出3个附加图层：

BA_SYD_DEMh1sec_fill：同上述基础图层，但已完成洼地填充

BA_SYD_FDIR：流向（Flow Direction）图层

BA_SYD_FACC：汇流累积量（Flow Accumulation）图层。

**数据集引用**

生物区域评估计划（2014）BA SYD 1秒SRTM（水文增强）数字高程模型及水文衍生数据集. 生物区域评估衍生数据集. 查阅日期：2018年7月18日，http://data.bioregionalassessments.gov.au/dataset/90f5ef3c-2141-4450-b44c-1afbd843236f.

**数据集上游源数据**

* **衍生自** [澳大利亚地质调查局（Geoscience Australia），1秒分辨率SRTM数字高程模型（Digital Elevation Model, DEM）](https://data.gov.au/data/dataset/9a9284b6-eb45-4a13-97d0-91bf25f1187b)