Hydro Net Junctions

River Environment Classification: This is REC2 (Version 3) , July 2017 - a publicly available dataset from NIWA Taihoro Nukurangi see here: https://www.niwa.co.nz/freshwater-and-estuaries/management-tools/river-environment-classification-0: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 recut 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 It is built on a newer version of the 30m digital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 a decade ago. Major updates include the revision of catchment land use information, by overlaying with the latest 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 as a zip file and used directly in ArcMap.
Alternatively, the layers can be extracted as shape files. NIWA acknowledges funding from the Terrestrial and Freshwater Biodiversity Information System (TFBIS) towards the preparation of REC v2. Terrestrial and Freshwater Biodiversity Information System (TFBIS)Update to REC2 (version 2.4) An updated version of REC2 (version 2.4) is now available for download. Improvements and enhancements include correction and reconfiguration of the network where necessary, and an update to variables such as annual rainfall and cumulative areas.  To view the data decompress and display with any Esri ArcGis software. The data consists of a geometric river network and associated catchment boundaries. Additionally, tables are provided within the geodatabase to quantify physical attributes associated with each flow line and within its catchment in the network. Here's the direct data download: Download REC v2.4 from NIWA N.B. This is a very large .zip file download of 487MB.

Data and Resources

Additional Info

Field Value
Theme ["geospatial"]
Author National Institute of Water and Atmospheric Research
Maintainer Tilmann Steinmetz
Maintainer Email Tilmann Steinmetz
Source http://data-niwa.opendata.arcgis.com/datasets/23dc3fcf9c63449b8dea050a8c4436cb_0
Created 2017-07-26T23:34:54.000Z
Date modified 2018-09-10T00:58:21.000Z
Language English
Spatial {"type": "Polygon", "coordinates": [[[166.263435, -47.417234], [179.466512, -47.417234], [179.466512, -34.270961], [166.263435, -34.270961], [166.263435, -47.417234]]]}
Source Identifier http://data-niwa.opendata.arcgis.com/datasets/23dc3fcf9c63449b8dea050a8c4436cb_0
Record created August 31, 2018, Last Updated November 1, 2018