NZ Regional River Names (REC2) Layer

NZ Regional River Names (based on REC2) Layer can be used to display rivers in New Zealand and their names. 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. Examples where the REC can be used include, catchment rainfall calculations, catchment river flows, flood forecasting, land use and catchment associations. Creation The REC was originally created using hydrological networking tools and a digital elevation model. River names have been attached where available. REC2 (River Environment Classification, v2.5) - June 2019 [Hosted Feature Layer] This service depicts rivers as lines 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 It is built on a newer version of the 30m digital elevation model, in which the original 20m contours were supplemented with, for example, more spot elevation data and a better coastline contour.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 based on 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: 2022-01-19 03:16 Item Page Last Modified: 2025-04-05 16:14 Owner: NIWA_OpenData NZ Rivers and Names No data edit dates available Fields: CATAREA,CUM_AREA,nzsegment,LENGTHDOWN,Headwater,StreamOrde,upElev,downElev,headw_dist,segslpmean,LID,reachtype,FROM_NODE,TO_NODE,Shape_Leng,RivName