Results of a study into the use of airborne remote sensing to identify habitats and biotopes in the Mawddach estuary
Posibilrwydd defnyddio synhwyro pell o'r awyr i ganfod cynefinoedd a biotopau yn aber Mawddach

  • English
  • wel
  • All

This dataset contains the results of a study into the use of airborne remote sensing to produce a comprehensive thematic map of biotope and sediment type distribution in the Mawddach estuary. The purpose of this data capture was to be able to report on the condition of the Mawddach estuary a number of provisional attributes have been identified which may require monitoring e.g. the relative proportion of sandy and muddy biotopes and distribution of major communities. This project investigated the possibility of using remotely sensed data to provide a contextual overview of broad-scale attributes in a monitoring programme.

Identification

Dynodydd
Identifier
NRW_DS87141
Teitl Amgen
Alternative Title
  • Section 3.4.4: Contract sceince report No. 380, MMR No. 1
Laith Metadata
Metadata Language
English
Lineage

The survey was carried out over an 80 minute period. Initial surveying was carried out at 2000 feet to obtain a swath of imagery covering the entire width of the estuary. This was followed by a 1000 feet survey along the predetermined flight-lines. True colour video, infra-red video and hyperspectral data were recorded during the entire survey and recording was synchronised to GPS time for all video data. All data acquired during the survey were recorded on analogue video tapes, these required digitising before processing. Data capture operations produced 1) raw colour and infra-red image frames, 2) raw hyperspectral reflectance data, 3) Georeferenced database record of flight line. Processing of this imagery included geometric, radiometric and bi-directional reflectance corrections in order to produce a thematic map of biotope/ sediment/ vegetation distribution.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2001-04-30
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Spectral Signatures Ltd. -
NovaUCD, NovaUCD, Belfield, Dublin 4, Ireland
http://www.spectral.ie/
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
340
Gwerth uchaf
Maximum value (metres)
680
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ( )

    Specification

    Reports in Word format

  • Geographic Information System ( )

    Specification

    GIS Images (including Phase 1 images) in MapInfo and Aerial photography .tif format

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

The survey was carried out over an 80 minute period. Initial surveying was carried out at 2000 feet to obtain a swath of imagery covering the entire width of the estuary. This was followed by a 1000 feet survey along the predetermined flight-lines. True colour video, infra-red video and hyperspectral data were recorded during the entire survey and recording was synchronised to GPS time for all video data. All data acquired during the survey were recorded on analogue video tapes, these required digitising before processing. Data capture operations produced 1) raw colour and infra-red image frames, 2) raw hyperspectral reflectance data, 3) Georeferenced database record of flight line. Processing of this imagery included geometric, radiometric and bi-directional reflectance corrections in order to produce a thematic map of biotope/ sediment/ vegetation distribution.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • aerial photography (air photography) (aerial photographs)
  • aerial surveys
  • remote sensing
  • Mawddach Estuary
  • estuaries (see also specific estuary names)
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2025-01-08
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a'r Sarnau cSAC : 1. Progress to March 2001
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

The following data is considered OS derived data and is therefore jointly owned by CCW and the Ordnance Survey. CCW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CCGC/CCW and © Crown copyright [2001]. All rights reserved. Countryside Council for Wales, AC0000849444. Third parties seeking to re-use this data require a Licence issued by CCW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-3837313431 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-03T11:14:21.19Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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