Superseded Geofabric Hydrology Reporting Catchments V2.1.1

Geofabric Hydrology Reporting Catchments comprises two related views of hydrological catchments to be used for analysis and reporting purposes. Firstly, a topological network view of hydrological catchments represented as a simplified node-link network using a subset of the contracted nodes (AHGFNode) and the links (AHGFLink) between them; and secondly, a catchments view of the hydrology using the contracted catchments (AHGFContractedCatchment). The AHGFNode feature class contains contracted nodes that are points of hydrological significance that carry identity. They include the confluence of major named streams, coastal stream termini, waterbody inflow and outflows and inland sinks. It also contains a new class of node called diffuse nodes that represent diffused flow from groups of nodes at coastal, delta or inter-catchment outlets. The AHGFLink feature class provides the topological connectors between a subset of contracted nodes that participate in the simplified node-link network. The AHGFContractedCatchment feature class contains catchment polygons (that are aggregations of AHGFCatchments) for the subset of contracted nodes that participate in the simplified node link network. These catchments are part of a hierarchy that can be aggregated based on upstream relationships. This product contains five feature types including: Node, Link, Contracted Catchment, Node-Link Connectivity (upstream), and Node-Link Connectivity (downstream).

水文地理结构报告集水区（Geofabric Hydrology Reporting Catchments）包含两类服务于分析与报告工作的水文集水区相关视图：其一为水文集水区拓扑网络视图，以缩减节点（AHGFNode）及其间链路（AHGFLink）的子集构建简化节点-链路网络，以此表征集水区拓扑结构；其二为水文集水区视图，采用收缩集水区（AHGFContractedCatchment）呈现相关水文信息。

AHGFNode要素类包含具备标识属性且具有水文重要性的缩减节点，此类节点涵盖主流汇流点、沿海河流末端、水体进出口以及内陆汇点。该要素类还包含一类名为弥散节点的新型节点，用于表征沿海、三角洲或跨集水区出口处节点群组产生的弥散径流。

AHGFLink要素类为参与简化节点-链路网络的缩减节点子集提供拓扑连接支撑。AHGFContractedCatchment要素类包含对应参与简化节点-链路网络的缩减节点子集的集水区多边形（即AHGFCatchments的聚合体），此类集水区属于层级化结构，可依据上游关联关系进行聚合运算。

本数据集包含五类要素类型，分别为：节点、链路、收缩集水区、节点-链路上游连通性，以及节点-链路下游连通性。