REC New Zealand

The REC groups rivers and parts of river networks that share similar ecological characteristics, including physical and biological. Rivers that share the same class can be treated as similar to one another and different to rivers in other classes. The REC classification system groups rivers according to several environmental factors that strongly influence or cause the rivers’ physical and ecological characteristics (climate, topography, geology and land cover). Stream order is the numerical position of a tributary or section of a river within the entire network. Headwater streams are assigned a stream order of 1. When two tributaries of the same stream order meet, the order increments by one for the next section downstream. However, if two sections meet where one section has higher order than the other, the next section downstream has the same order as the highest upstream section.
 
Citation proposal
(2010) . REC New Zealand. https://dc.niwa.co.nz:/niwa_dc/srv/api/records/425D0AE7-9794-48B9-A073-67499CFF27A6
 

Simple

Alternate title
REC, river, network, environment, classification
Date ( Creation )
2004-01-01
Date ( Publication )
2010-04-01
Date ( Revision )
2006-01-01
Presentation form
Digital map
Other citation details
Crown Copyright 2004
Purpose
REC classes can be used to stratify monitoring sites within a region and as a basis for reporting environmental data. The characteristics of each class can be used to make management decisions in a rational and meaningful way for the class as a whole. The REC provides a basis for resource managers to develop strategic policy using rational and justifiable information in the absence of specific detailed information for each river.

  Point of contact

ANZLIC Jurisdictions ( Theme )
  • New Zealand
ANZLIC Search Words ( Theme )
  • WATER-Surface
  • WATER-Rivers
  • WATER-Hydrology
Use limitation
Ministry for the Environment (New Zealand)
Use limitation
Licensed under Creative Commons Attribution 3.0 New Zealand.
Spatial representation type
Vector
Metadata language
English
Character set
UTF8
Topic category
  • Inland waters
  • Environment
Environment description
Version 6.2 (Build 9200) ; Esri ArcGIS 10.6.1.9270
N
S
E
W


Geographic identifier
nzl

 

Date ( Publication )
2009-03-31
Edition
Version 1.0
Edition date
2009-03-31
Identifier
http://asdd.ga.gov.au/asdd/profileinfo/anzlic-country.xml#Country

  Point of contact

Reference system identifier
EPSG / 2193 / 7.9.4(9.0.0)
Topology level
Geometry only
Geometric object type
Composite
Geometric object count
576689
Distribution format
  • SDE Feature Class ()

Distributor

  Point of contact

OnLine resource
http://koordinates.com  
Other
series
Statement
The REC represents rivers as networks of sections including their upstream catchments. Sections have an average length of 700 metres. The class of each section is based on an evaluation of six factors. The first four factors are the climate, topography, geology and land cover of the upstream catchment of individual sections of the river network. The last two factors are the Network-Position and the landform of the valley of each section of the network. Each factor is subdivided into categories that discriminate variation in characteristics. Choice of categories has been guided by scientific knowledge of the causes of patterns in characteristics of rivers at different spatial scales. The higher levels of the REC discriminate large-scale patterns in general characteristics. The lower the level of the classification used, the smaller the scale of the patterns that are defined by REC. Each level of the REC hierarchy is based on differences in a set of processes (for example hydrological processes) that are assumed to be the cause of patterns in physical and biological characteristics at a typical spatial scale. The River Environment Classification User Guide contains a comprehensive guide to the REC databases and uses. Updated in May 2010. ISBN 0-478-18919-2 ME Number 499

gmd:MD_Metadata

File identifier
425D0AE7-9794-48B9-A073-67499CFF27A6   XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name
dataset
Date stamp
2022-11-21T13:21:55
Metadata standard name
ISO 19139 Geographic Information - Metadata - Implementation Specification
Metadata standard version
2007

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