Dataset
Defra and JNCC Sentinel-1 Analysis Ready Data (ARD)
Abstract
These data have been created by the Department for Environment, Food and Rural Affairs (Defra) and Joint Nature Conservation Committee (JNCC) in order to cost effectively provide high quality, Analysis Ready Data (ARD) for a wide range of applications. The dataset contains modified Copernicus Sentinel-1 data processed into a normalised radar backscatter product on a linear scale in dB. Products acquired from ESA are Ground-Range Detected (GRD) Interferometric Wide-swath (IW) in the dual VV+VH polarisation (DV) mode, where both VV and VH polarisations are collected. Defra and JNCC data were processed on separate platforms using a common specification to produce complementary outputs up to and including the acquisition date 23/06/2023. Data acquired after that date were processed on a single platform to the same specification.
Sentinel-1 scenes processed before July 2021 have had a strip of data clipped from their northern edge to remove an artefact caused by a deprecated processing method. Details can be found in the lineage statement of the metadata for all affected scenes.
Details
| Previous Info: |
No news update for this record
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| Previously used record identifiers: |
No related previous identifiers.
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| Access rules: |
Public data: access to these data is available to both registered and non-registered users.
Use of these data is covered by the following licence(s): http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ When using these data you must cite them correctly using the citation given on the CEDA Data Catalogue record. |
| Data lineage: |
Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA). |
| Data Quality: |
Data are as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA).
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| File Format: |
These data are provided in Cloud Optimized GeoTIFF (COG) format. Each product comes with xml metadata file.
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Related Documents
| GDAL |
| ESA SNAP toolbox |
| JNCC ‘Simple ARD Service’ User Guide |
Process overview
Instrument/Platform pairings
| Sentinel 1 Synthetic Aperture Radar (SAR) | Deployed on: Sentinel 1A |
Instrument/Platform pairings
| Sentinel 1 Synthetic Aperture Radar (SAR) | Deployed on: Sentinel 1B |
Computation Element: 1
| Title | Computation for Defra and JNCC Sentinel-1 Analysis Ready Data |
| Abstract | Sentinel-1 GRD products processed into a backscatter product using ESA SNAP. Processing included the following steps: apply orbit file, border and thermal noise removal, radiometric calibration, multilook, terrain correction using either the Aerial Photography Great Britain (APGB) 10m resolution DEM or the Ordnance Survey Northern Ireland (OSNI) 10m resolution DEM, radiometric normalisation (Kellndorfer approach, Kellndorfer et al., 1998) and refined Lee speckle filter. Data is outputted on a linear scale in dB. A final reprojection is applied to transform the data to either OSGB1936 (EPSG:27700) or TM65/Irish Grid (EPSG:29902) using GDAL. The processed product is stacked, containing VV_dB in Band 1 and VH_dB in Band 2. Please see individual image metadata for the versions of software used in processing. |
| Input Description | Sentinel-1 (C-Band SAR) Ground Range Detected (GRD) Interferometric Wide swath (IW) VV/VH |
| Output Description | Sentinel-1 GRD backscatter products |
| Software Reference | None |
| Output Description | None |
| Output Description | None |
No variables found.
Temporal Range
2018-01-01T00:00:00
Ongoing
Geographic Extent
59.4800° |
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-10.8500° |
2.0200° |
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49.8200° |