Superseded Geofabric Surface Network V2.1.1

The 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).

地貌结构地表网络产品（Geofabric Surface Network）提供了一系列关联要素类，可作为构建一致性水文地表河网分析成果的基础。该产品包含澳大利亚（不含海外领地）主要地表水文要素的地形一致性表达成果，其主体为自然地表水文要素，同时也涵盖部分人工水文要素（典型如水库及其他水文学相关地物）。本产品基于ANUDEM派生河网V1.1.2（ANUDEM Streams）的输入数据，该数据集是9秒分辨率ANUDEM派生栅格河网产品的矢量化版本。本产品与地貌结构地表制图产品（Geofabric Surface Cartography）中的河网存在关联，但二者互不相同。本河网产品基于GEODATA 9秒数字高程模型V3（DEM-9S Version 3），表征了地表河网的水流方向。相较于地貌结构地表制图产品，本产品更具概括性，着重表征河网的主河道，尤其适用于存在大量分流或河道断开的区域。此外，本产品的河网连通性表征了地表实际的河川径流路径，无需依赖地貌结构地表制图产品中对应的河道片段。这意味着地貌结构地表制图产品可能将河道表示为间断或间歇性地物，而本产品则将同一河道表征为连续连通的地物。换言之，本产品还原了在地形模型假设下，拥有足够径流水量时河道应遵循的自然流径。本产品具备完全合规的拓扑结构，所有河道片段均遵循正确的流向；同时基于地形模型构建了完整的水流通路连通性。本产品包含六大要素类型，分别为：水体（Waterbody）、河网河道（Network Stream）、河网节点（Network Node）、汇水区（Catchment）、上游连通性（Network Connectivity (Upstream)）以及下游连通性（Network Connectivity (Downstream)）。