Geofabric Surface Network - V2.1

## **Abstract** \n\nThis dataset and its metadata statement were supplied to the Bioregional Assessment Programme by a third party and are presented here as originally supplied.\n\n\n\nThe Geofabric Surface Network product provides a set of related feature classes to be used as the basis for production of consistent hydrological surface stream network analysis. This product contains a topographically consistent representation of the (major) surface water features of Australia (excluding external territories). Primarily, these are natural surface hydrology features but the product also contains some man-made features (notably reservoirs and other hydrographic features). The Geofabric Surface Network product is based upon the input from ANUDEM Derived Streams V1.1.2 (ANUDEM Streams) which is the vectorised version of the nine second ANUDEM derived raster steams product. The product is related to, but distinct from, the stream network contained in the Geofabric Surface Cartography product. The network product represents the flow direction of streams over the surface of the terrain, based on the GEODATA Nine Second Digital Elevation Model (DEM-9S) Version 3. This product is more generalised than the Geofabric Surface Cartography and represents the main channels of the stream, particularly in areas where streams are heavily anabranched or disconnected. In addition, the stream connectivity represents a stream flow over the terrain, regardless of the presence of a corresponding Geofabric Surface Cartography stream segment. This means that the Geofabric Surface Cartography product may represent a stream as an interrupted or intermittent feature, whereas this product represents the same stream as a continuous connected feature. That is, the path that a stream would take (according to the terrain model) if sufficient water were available for flow. This product is fully topologically correct which means that all the stream segments flow in the correct direction. It also has full connectivity based on the flow of water across a terrain model. This product contains six feature types including: Waterbody, Network Stream, Network Node, Catchment, Network Connectivity (Upstream) and Network Connectivity (Downstream).\n\n## **Dataset History** \n\nGeofabric Surface Network is part of a suite of Geofabric products produced by the Australian Bureau of Meteorology. The geometry of this product is largely derived from the ANUDEM Derived Streams V1.1.2 (ANUDEM Streams). It consists of water bodies such as swamps, reservoirs, lakes, etc as derived from AusHydro V1, as well as the stream lines and stream line connectors through these water bodies. The ANUDEM Streams are firstly vectorised to be usable in vector line feature format and are then informed and modified by the coincident locations of the AHGFMappedStream feature class. The features are organised into specific feature class subtypes, based upon both the inputs from the AusHydro V1.7.2 and their behaviour within the AHGF Network Stream relationships. All of the AHGFNetworkStream and AHGFWaterbody features participate in the connected stream flow topology. \n\n\n\nThis product also contains the AHGFCatchment features that are derived from the National Catchment Boundaries V1.1.4. The AGHFCatchment feature class consist of the lowest level stream flow catchments based upon the inputs from ANUDEM Streams. The catchment boundaries are based upon a single AHGFNetworkStream extent over GEODATA National 9 Second DEM grid. These catchments form the basis of aggregated catchment boundaries, either by Contracted Nodes or by Pfafstetter ID Levels.\n\n\n\nAll of these features participate in the connected stream flow topology.\n\n\n\nProcessing steps: \n\n1. ANUDEM Streams dataset is received and loaded into the Geofabric development GIS environment. \n\n2. Feature classes from ANUDEM Streams are recomposed into composited Geofabric Feature Dataset Feature Classes in the Geofabric Maintenance Geodatabase.\n\n3. Re-composited feature classes in the Geofabric Maintenance Geodatabase Feature Dataset are assigned unique Hydro-IDs using ESRI ArcHydro for Surface Water (ArcHydro: 1.4.0.180 and ApFramework: 3.1.0.84).\n\n4. Feature classes from the Geofabric Maintenance Geodatabase Feature Dataset are extracted and reassigned to the Geofabric Surface Network Feature Dataset within the Geofabric Surface Network Geodatabase.\n\n\n\nA complete set of data mappings, from input source data to Geofabric Products, is included in the Geofabric Product Guide, Appendices.\n\n## **Dataset Citation** \n\nBureau of Meteorology (2011) Geofabric Surface Network - V2.1. Bioregional Assessment Source Dataset. Viewed 13 March 2019, http://data.bioregionalassessments.gov.au/dataset/ed3acf9b-888c-4d53-b376-ecab89781651.## **摘要** 本数据集及其元数据说明由第三方提供给**生物区域评估计划（Bioregional Assessment Programme）**，此处按原始提交版本呈现。 **地质构造地表网络（Geofabric Surface Network）** 产品提供一组关联要素类，可作为生成一致性水文地表河网分析成果的基础。本产品包含澳大利亚（不含海外领地）主要地表水体要素的地形一致性表达成果。这些要素以自然地表水文要素为主，同时也包含部分人工要素（典型如水库及其他水文要素）。 本产品基于**ANUDEM派生河流V1.1.2（ANUDEM Streams）** 的输入数据，该数据集是9秒分辨率ANUDEM派生栅格河流产品的矢量化版本。本产品与**地质构造地表制图产品（Geofabric Surface Cartography product）** 相关但有所区别：其基于**GEODATA 9秒数字高程模型V3（GEODATA Nine Second Digital Elevation Model, DEM-9S V3）** 表达地表地形的河流流向。本产品比地质构造地表制图产品更具概化性，着重表征河流主河道，尤其适用于存在大量分汊或断流的区域。此外，本产品的河流连通性表征地形上的河流水流路径，不受地质构造地表制图产品中对应河段的存在与否限制。这意味着地质构造地表制图产品可能将某条河流表征为断续或间歇要素，而本产品则将其表达为连续连通要素，即基于地形模型，当有足够水量时河流应遵循的流动路径。本产品完全符合拓扑正确性要求，即所有河段均沿正确方向流动，且基于地形模型的水流动逻辑实现了完整连通性。本产品包含6类要素：水体（Waterbody）、网络河流（Network Stream）、网络节点（Network Node）、汇水区（Catchment）、上游网络连通性（Network Connectivity (Upstream)）及下游网络连通性（Network Connectivity (Downstream)）。 ## **数据集历史** 地质构造地表网络是澳大利亚气象局（Australian Bureau of Meteorology）生产的地质构造产品套件的组成部分。本产品的几何形态主要源自ANUDEM派生河流V1.1.2（ANUDEM Streams），包含从AusHydro V1提取的沼泽、水库、湖泊等水体要素，以及穿过这些水体的河道与河道连接线。ANUDEM派生河流首先被矢量化为可使用的矢量线要素格式，随后依据AHGF制图河流（AHGFMappedStream）要素类的重合位置进行修正与完善。 本产品的要素基于AusHydro V1.7.2的输入数据以及AHGF网络河流关系，被划分为特定的要素类子类型。所有AHGF网络河流（AHGFNetworkStream）与AHGF水体（AHGFWaterbody）要素均参与连通河流水文拓扑。 本产品还包含源自**国家汇水区边界V1.1.4（National Catchment Boundaries V1.1.4）** 的AHGF汇水区（AHGFCatchment）要素。AHGF汇水区要素类基于ANUDEM派生河流的输入数据构建，为最低层级的河流水文汇水区。汇水区边界基于GEODATA国家9秒DEM网格上的单条AHGF网络河流范围生成。这些汇水区可通过收缩节点（Contracted Nodes）或普发夫施泰特（Pfafstetter）ID层级聚合为更高层级的汇水区边界。 所有上述要素均参与连通河流水文拓扑。 ### 处理流程： 1. 接收ANUDEM派生河流数据集并加载至地质构造开发GIS环境。 2. 将ANUDEM派生河流的要素类重组为地质构造维护地理数据库中的复合地质构造要素数据集要素类。 3. 利用ESRI地表水文ArcHydro工具（ArcHydro: 1.4.0.180，ApFramework: 3.1.0.84）为地质构造维护地理数据库要素数据集中的重组要素类分配唯一水文ID。 4. 提取地质构造维护地理数据库要素数据集的要素类，并重新分配至地质构造地表网络地理数据库中的地质构造地表网络要素数据集。 完整的输入源数据至地质构造产品的数据映射表已收录于《地质构造产品指南》附录中。 ## **数据集引用** 澳大利亚气象局（2011）地质构造地表网络 - V2.1。生物区域评估源数据集。查阅日期：2019年3月13日，http://data.bioregionalassessments.gov.au/dataset/ed3acf9b-888c-4d53-b376-ecab89781651。