NZ Large River Catchments

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 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 It is built on a newer version of the 30m digital elevation model, in which the original 20m contours were supplemented with, for example, more spot elevation data and a better coastline contour.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.

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 v2.5Coordinate Reference System: NZTM (New Zealand Transverse Mercator, EPSG: 2193)

Geometric Representation of Rivers: Lines

Geometric Representation of Catchments: Polygons

Extent (Bounding Box): Top(Latitude) -33.9534Bottom(Latitude) -47.4867 Left (Longitude) 166.2634 Right (Longitude) 178.9733

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

 
Citation proposal
. NZ Large River Catchments. https://dc.niwa.co.nz:/niwa_dc/srv/api/records/c57c9c6c-3ef2-44a1-9733-d13b7286c652
 

Simple

Date ( Creation )
2021-07-21
Presentation form
Digital document
Purpose
New Zealand NZ Large River Catchments: layer can be used in conjunction with the NIWA NZ REC (River Environment Classification) and NZ Rivers and Names layer.
Credit
National Institute of Water and Atmosphere (NIWA)
Maintenance and update frequency
As needed
Keywords
  • Live Data and Maps
  • Catchment
  • NZ
  • River
  • Large
  • New Zealand
  • NZ
  • freshwater
Other constraints
Other Constraints
Spatial representation type
Vector
Metadata language
English
Character set
UTF8
Topic category
  • Inland waters
Environment description
processing environment is ArcGIS
N
S
E
W


Reference system identifier
EPSG / 2193 / 6.15(9.0.0)
Topology level
Geometry only
Geometric object type
Composite
Distribution format
  • ArcGIS Online Hosted Feature Layer (2022 )

OnLine resource
River Environment Classification - Large Catchments  
Hierarchy level
Dataset
Statement

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 layer is using Esri's ArcGIS Online Optimizations for fast rendering.

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

gmd:MD_Metadata

File identifier
c57c9c6c-3ef2-44a1-9733-d13b7286c652   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name
dataset
Date stamp
2022-11-15T15:51:05
Metadata standard name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata standard version
2007

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