Results of a study into the use of airborne remote sensing to identify habitats and biotopes in the Mawddach estuary
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
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS87141
- Alternative Title
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- Posibilrwydd defnyddio synhwyro pell o'r awyr i ganfod cynefinoedd a biotopau yn aber Mawddach
- Section 3.4.4: Contract sceince report No. 380, MMR No. 1
- 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.
- Dataset Reference Date (Publication)
- 2001-04-30
Temporal Extent
- Begin date
- 1999-10-07
- End date
- 2001-04-30
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Vertical Extent
- Minimum value (metres)
- 340
- Maximum value (metres)
- 680
- Vertical CRS
Distribution
- Format Type and Description
-
-
Documents
()
- Specification
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[A] GIS Images (including Phase 1 images) in MapInfo and [B] Aerial photography .tif format [C] Reports in Word format
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- 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
Keywords
Keywords
- NRW Thesaurus
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- aerial surveys
- aerial photography (air photography) (aerial photographs)
- Mawddach Estuary
- remote sensing
- estuaries (see also specific estuary names)
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat characterisation
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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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
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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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
- Use constraints type
- Other restrictions
- Other constraints
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© 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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-3837313431 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:39:52.846Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0