Rumney Great Wharf to River Usk Drone Survey 2021
Natural Resources Wales (NRW) wish to establish a topographical baseline and aerial imagery of the foreshore and surrounds to help inform the consideration of possible nature-based solutions at this location. The purpose of the survey was to collect topographic data of the foreshore, along the 12km frontage that stretches between Cardiff in the west and Newport to the east. Vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, a RTK capable drone was used, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. The survey was carried out over a period of 6 days between the 3rd and 12th of February 2021. Flights were planned to ensure lowest possible tides. In total, 19 flights were completed to collect the aerial data, taking a combined 285 minutes (4.75 hours). Survey deliverables comprised ASCII Grid, Orthophotos and Obliques
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS124922
- Metadata Language
- English
- Lineage
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The following survey equipment was used for the survey: • Trimble GNSS Rover • DJI Phantom 4 RTK (x2) The DJI Phantom 4 RTK was selected as it has a built in RTK GNSS receiver. This enables a higher accuracy of data capture, particularly in areas where ground control points are not possible, such as the mudflats of this survey. A Trimble GNSS Rover connected to the VRS network receiving RTK corrections was used to collect control points for this survey. The GNSS Rover collects points to a level of 1-2cm accuracy depending on atmospheric conditions. A total of 87 Ground control points were collected for use in the processing of this data set. Where safe to do so, control points were taken at the interface between the salt marsh and the mud. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, we selected a RTK capable drone, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. In total, 19 flights were required to complete the survey. These were undertaken from the coastal path and on the salt marsh where possible. Automated flight plans were used to ensure consistent data coverage. These flights were flown in a ‘lawnmower’ pattern with an overlap of 70% and sidelap of 80%, ensuing high quality outputs in the post processing. Flights were conducted at the maximum altitude of 120m. A total of 5,942 vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline.
- Additional Information
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Armstrong, S., Whitehead, P., Scott, C., Hull, S., 2021. Rumney Great Wharf Saltmarsh Restoration / Enhancement Feasibility and Preferred Option Studies. Produced by ABPmer for NRW. NRW Evidence Report No: 528, 96pp, NRW, Cardiff
- Dataset Reference Date (Publication)
- 2021-03-01
Extent
Extent
- Geographic Extent
- Severn Estuary
))
Distribution
- Format Type and Description
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Geographic Information System
(
)
- Specification
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A] ASCII Grid Digital Elevation Model at 0.5m resolution. (Also full capture resolution at least 10cm resolution) B] Orthophoto (.tiff) at 5cm resolution C] Oblique Imagery of the shoreline D] Survey report in pdf format.
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Geographic Information System
(
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Quality
Data quality
- Quality Scope
- Dataset
- 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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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The following survey equipment was used for the survey: • Trimble GNSS Rover • DJI Phantom 4 RTK (x2) The DJI Phantom 4 RTK was selected as it has a built in RTK GNSS receiver. This enables a higher accuracy of data capture, particularly in areas where ground control points are not possible, such as the mudflats of this survey. A Trimble GNSS Rover connected to the VRS network receiving RTK corrections was used to collect control points for this survey. The GNSS Rover collects points to a level of 1-2cm accuracy depending on atmospheric conditions. A total of 87 Ground control points were collected for use in the processing of this data set. Where safe to do so, control points were taken at the interface between the salt marsh and the mud. A key constraint of this survey was being unable to take GPS points out in the mudflats. To overcome this, we selected a RTK capable drone, which reduces the reliance on ground control points by ensuring that the geolocation for each image is significantly more accurate than on a standard drone. In total, 19 flights were required to complete the survey. These were undertaken from the coastal path and on the salt marsh where possible. Automated flight plans were used to ensure consistent data coverage. These flights were flown in a ‘lawnmower’ pattern with an overlap of 70% and sidelap of 80%, ensuing high quality outputs in the post processing. Flights were conducted at the maximum altitude of 120m. A total of 5,942 vertical images were taken for the photogrammetric reconstruction. Flights were also undertaken to capture oblique imagery looking back at the coastline.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- drone survey
- saltmarsh (salt-marsh) (salt marsh)
- coastal erosion
- erosion rates
- Type
- Theme
Citation
- Date (Publication)
- 2025-01-08
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
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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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Attribution statement: Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313234393232 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2025-03-17T11:37:45.404Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0