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A method for the automated extraction of environmental variables to help the classification of rivers in Britain

A method for the automated extraction of environmental variables to help the classification of rivers in Britain
A method for the automated extraction of environmental variables to help the classification of rivers in Britain

1. A number of systems for assessing river quality or for classifying rivers use data obtained from maps as a means of linking a given stretch of river with a reference site. The embodiment of the reference-state principle within the EC Water Framework Directive means that this trend will accelerate. 2. Historically, data such as the distance to source of river, altitude at source, altitude at site, and local slope have been derived from maps by hand, a process which is time consuming and prone to both random and systematic errors. 3. An automated computer-based extraction procedure has been developed on a GIS system to improve the speed and repeatability of such data collection. This paper describes the processes required to produce reliable data, to ensure quality control and to obtain optimal speed of data extraction. 4. The system has several applications including determination of catchment areas for the EC Water Framework Directive and delineation of reaches to support the development of physical quality objectives for rivers in England and Wales.

Environmental variables, GIS, Map-based data, River habitats
1052-7613
391-403
Dawson, F. H.
647f0a69-1fa8-415f-9542-599ec581410c
Hornby, D. D.
75cfaf57-72c1-4392-a78c-89b4b1033dca
Hilton, J.
65953b14-02b0-4aea-80e0-f97e6163992d
Dawson, F. H.
647f0a69-1fa8-415f-9542-599ec581410c
Hornby, D. D.
75cfaf57-72c1-4392-a78c-89b4b1033dca
Hilton, J.
65953b14-02b0-4aea-80e0-f97e6163992d

Dawson, F. H., Hornby, D. D. and Hilton, J. (2002) A method for the automated extraction of environmental variables to help the classification of rivers in Britain. Aquatic Conservation: Marine and Freshwater Ecosystems, 12 (4), 391-403. (doi:10.1002/aqc.534).

Record type: Article

Abstract

1. A number of systems for assessing river quality or for classifying rivers use data obtained from maps as a means of linking a given stretch of river with a reference site. The embodiment of the reference-state principle within the EC Water Framework Directive means that this trend will accelerate. 2. Historically, data such as the distance to source of river, altitude at source, altitude at site, and local slope have been derived from maps by hand, a process which is time consuming and prone to both random and systematic errors. 3. An automated computer-based extraction procedure has been developed on a GIS system to improve the speed and repeatability of such data collection. This paper describes the processes required to produce reliable data, to ensure quality control and to obtain optimal speed of data extraction. 4. The system has several applications including determination of catchment areas for the EC Water Framework Directive and delineation of reaches to support the development of physical quality objectives for rivers in England and Wales.

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More information

Published date: 1 July 2002
Keywords: Environmental variables, GIS, Map-based data, River habitats

Identifiers

Local EPrints ID: 433382
URI: http://eprints.soton.ac.uk/id/eprint/433382
ISSN: 1052-7613
PURE UUID: 3da96524-6a5c-4fa5-89d8-729df37ae846
ORCID for D. D. Hornby: ORCID iD orcid.org/0000-0001-6295-1360

Catalogue record

Date deposited: 15 Aug 2019 16:30
Last modified: 18 Feb 2021 17:02

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