NZ Large River Catchments

Earth Sciences New Zealand can no longer maintain this feature layer nor the underlying hosting infrastructure and a hosted vector tile layer has been created as a replacement for simple visualisation tasks. To access the vector tile layer, you can click “Open in Map Viewer” (Add this layer as the basemap https://niwa.maps.arcgis.com/home/item.html?id=f5e9b17de4794f1d8d2d8cd7b7375b54. You can then add another basemap and move this one to the top - then you have the basemap of your choice plus the catchment information layers) [THIS PAGE IS ONLY KEPT FOR REFERENCE] This layer is based on the New Zealand River Environment Classification REC2 V5 and describes the larger catchments of New Zealand that are a Strahler order five and greater. It also has the associated names that belong to the parent sea draining catchment. It was originally derived by dissolving local Strahler Order 1 watersheds. REC2 (River Environment Classification, v2.5) - June 2019 [Hosted Feature Layer] This service depicts rivers as lines and catchments as polygons The River Environment Classification (REC) is a database of catchment spatial attributes, summarised for every segment in New Zealand's network of rivers. The attributes were compiled for the purposes of river classification, while the river network description has been used to underpin models. Typically, models (e.g. CLUES and TopNet) would use the dendritic (branched) linkages of REC river segments to perform their calculations. Since its release and use over the last decade, some errors in the location and connectivity of these linkages have been identified. The current revision corrects those errors, and updates a number of spatial attributes with the latest data. REC2 provides a re-cut framework of rivers for modelling and classification. It is built on a newer version of the 30m digital elevation model, in which the original 20m contours were supplemented with, for example, more spot elevation data and a better coastline contour. Boundary errors were minimised by processing contiguous areas (such as the whole of the North Island) together, which wasn't possible when it was originally created. Major updates include the revision of catchment land use information, by overlaying with the land cover database (LCDB3, current as at 2008), and the update of river and rainfall statistics with data from 1960-2006. The river network and associated attributes have been assembled within an ArcGIS geodatabase. Topological connectivity has been established to allow upstream and downstream tracing within the network. REC2 can be downloaded or streamed and used directly in ArcMap. (A file geodatabase version for ArcGIS of REC2 can be downloaded as a zip file and used directly for analyses in ArcMap from here) This is REC2 (Version 5) , June 2019 - a publicly available dataset from NIWA Taihoro Nukurangi. NIWA acknowledges funding from the MBIE SSIF towards the preparation of REC v2.5 Coordinate Reference System: NZTM (New Zealand Transverse Mercator, EPSG: 2193) Geometric Representation of Rivers: Lines Extent (Bounding Box): Top(Latitude) -33.9534Bottom(Latitude) -47.4867 Left (Longitude) 166.2634 Right (Longitude) 178.9733 _________________________________________________________________________________________________________________ Item Page Created: 2021-10-05 03:41 Item Page Last Modified: 2025-08-21 09:14 Owner: NIWA_OpenData DN2_large_odr6_catch No data edit dates available Fields: Shape,FID_1,diss,FID_2,HydroID,CATAREA,CUM_AREA,nzsegment,StreamOrde,upElev,downElev,upcoordX_1,downcoor_1,downcoor_2,upcoordY_1,RivName,Distance,ord_diff,Distance_1,Shape_Length,Shape_Area新西兰地球科学署（Earth Sciences New Zealand）已无法继续维护该要素图层及其底层托管基础设施，现已创建托管矢量瓦片图层作为简易可视化任务的替代方案。如需访问该矢量瓦片图层，可点击“在地图查看器中打开”（将该图层添加为底图：https://niwa.maps.arcgis.com/home/item.html?id=f5e9b17de4794f1d8d2d8cd7b7375b54。随后您可添加其他底图并将该图层置顶，即可同时使用自选底图与流域信息图层）【本页面仅作存档保留】 本图层基于新西兰河流环境分类REC2 V5制作，描述了新西兰斯特拉勒（Strahler）等级5级及以上的大型流域，附带所属入海母流域的相关名称。该数据集最初通过合并局部斯特拉勒等级1级小流域得到。 河流环境分类REC2 v2.5（River Environment Classification, v2.5）——2019年6月【托管要素图层】 本服务将河流以线条形式呈现，流域以多边形形式呈现。 河流环境分类（River Environment Classification，简称REC）是一套涵盖新西兰河网各河段的流域空间属性数据库，属性数据用于河流分类，而河网描述则为各类模型提供支撑。典型应用包括CLUES与TopNet等模型，这类模型会借助REC河网河段的树状（分支）连接关系开展计算。 在该数据集发布并投入使用的十余年间，其河段位置与连接关系中的部分错误已被发现。本次更新修正了上述错误，并依托最新数据更新了多项空间属性。 REC2提供了重构后的河网框架，用于建模与分类工作。该框架基于新版30米数字高程模型（DEM）构建，原有的20米等高线数据补充了更多高程点数据与更精准的海岸线等高线等内容。通过对连片区域（如整个北岛）进行统一处理，边界误差得到了有效控制——这在数据集最初制作时无法实现。 本次主要更新包括：通过叠加2008年版土地覆盖数据库（LCDB3）更新流域土地利用信息；利用1960-2006年的观测数据更新河流与降雨统计数据。 河网及其关联属性已整合至ArcGIS地理数据库中，已建立拓扑连接关系以支持河网内的上下游追踪。 REC2可直接下载或流式加载，并在ArcMap中直接使用。（可从指定位置下载适用于ArcGIS的REC2文件地理数据库压缩包，直接用于ArcMap中的分析工作） 本数据集为2019年6月发布的REC2（版本5），是新西兰国家水与大气研究所（National Institute of Water and Atmospheric Research，简称NIWA，毛利语名称：NIWA Taihoro Nukurangi）公开提供的数据集。NIWA感谢新西兰商业、创新和就业部（Ministry of Business, Innovation and Employment，简称MBIE）的战略科学投资基金（Strategic Science Investment Fund，简称SSIF）为REC v2.5的编制提供资助。 坐标参考系统：新西兰横墨卡托投影（New Zealand Transverse Mercator，简称NZTM，EPSG: 2193） 河流几何表达形式：线条 范围（Bounding Box）： 顶部（纬度）：-33.9534 底部（纬度）：-47.4867 左侧（经度）：166.2634 右侧（经度）：178.9733 _________________________________________________________________________________________________________________ 项目页面创建时间：2021-10-05 03:41 项目页面最后修改时间：2025-08-21 09:14 所有者：NIWA_OpenData DN2_large_odr6_catch 暂无数据编辑日期 字段：Shape,FID_1,diss,FID_2,HydroID,CATAREA,CUM_AREA,nzsegment,StreamOrde,upElev,downElev,upcoordX_1,downcoor_1,downcoor_2,upcoordY_1,RivName,Distance,ord_diff,Distance_1,Shape_Length,Shape_Area