Aerial imagery of Ynyslas coastal sand dunes, Wales in 2020
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Identification info
- Metadata Language
- English (en)
- Character set
- utf8
- Dataset Reference Date ()
- 2022-11-15
- Identifier
- doi: / 10.5285/ac7071cb-79a3-400d-9f17-13dc4a657083
- Other citation details
- Smyth, T.A.G., Wilson, R. (2022). Aerial imagery of Ynyslas coastal sand dunes, Wales in 2020. NERC EDS Environmental Information Data Centre 10.5285/ac7071cb-79a3-400d-9f17-13dc4a657083
- GEMET - INSPIRE themes, version 1.0 ()
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- Land Cover
- Limitations on Public Access
- otherRestrictions
- Other constraints
- Registration is required to access this data
- Use constraints
- otherRestrictions
- Use constraints
- otherRestrictions
- Other constraints
- If you reuse this data, you should cite: Smyth, T.A.G., Wilson, R. (2022). Aerial imagery of Ynyslas coastal sand dunes, Wales in 2020. NERC EDS Environmental Information Data Centre https://doi.org/10.5285/ac7071cb-79a3-400d-9f17-13dc4a657083
- Spatial representation type
- grid
- Distance
- 0.01 urn:ogc:def:uom:EPSG::9001
- Topic category
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- Imagery base maps earth cover
- Begin date
- 2020-02-01
- End date
- 2020-02-28
- Code
- WGS 84
Distribution Information
- Data format
-
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TIFF
()
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TIFF
()
- Resource Locator
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Supporting information
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Supporting information
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- Quality Scope
- dataset
- Other
- dataset
Report
- Dataset Reference Date ()
- 2010-12-08
- Statement
- The data was originally collected to test the accuracy and repeatability of bare sand and vegetation cover in dunes mapped from aerial imagery. Collection method: RGB aerial imagery was collected using a DJI Mavic Pro 2 uncrewed aerial vehicle (UAV). The flight was planned with Pix4DCapture based on a ground pixel resolution of 0.01 m. Lateral and longitudinal overlap was set to 80%. Prior to flying, eight (5.8 per 100 photos) Ground Control Points (GCPs) were evenly distributed throughout the dune and their location was surveyed using a Trimble R8 differential global positioning system (DGPS). Orthorectification and mosaicking of the aerial imagery collected was performed using Pix4Dmapper utilising a fully automated workflow based on Structure-from-Motion (SFM) digital photogrammetry algorithms Nature and Units of recorded values: Pixel values for Red, Green, and Blue at 0.01 m resolution. Quality Control: Pix4Dmapper was used to manually identify the surveyed GCPs within the aerial imagery. By comparing the absolute coordinates of the GCPs surveyed with those for the same location within the resulting orthomosaic, a root mean square error of 0.003 m was calculated in the X, Y and Z directions, respectively, indicating a high degree of relative accuracy.
Metadata
- File identifier
- ac7071cb-79a3-400d-9f17-13dc4a657083 XML
- Metadata Language
- English (en)
- Character set
- ISO/IEC 8859-1 (also known as Latin 1)
- Resource type
- dataset
- Hierarchy level name
- dataset
- Metadata Date
- 2024-03-05T09:24:39
- Metadata standard name
- UK GEMINI
- Metadata standard version
- 2.3