JNCC Sentinel-2 indices Analysis Ready Data (ARD) Normalised Difference Water Index (NDWI)
Sentinel-Hub NDWI description: The NDWI is used to monitor changes related to water content in water bodies. As water bodies strongly absorb light in visible to the infrared electromagnetic spectrum, NDWI uses green and near-infrared bands to highlight water bodies. It is sensitive to built-up land and can result in the over-estimation of water bodies.
Index values greater than 0.5 usually correspond to water bodies. Vegetation usually corresponds to much smaller values and built-up areas to values between zero and 0.2.
NDWI = (GREEN – NIR) / (GREEN + NIR)
Sentinel-2 NDWI = (B03 - B08) / (B03 + B08)
These data have been created by the Joint Nature Conservation Committee (JNCC) as part of a Defra Natural Capital and Ecosystem Assessment (NCEA) project to produce a regional, and ultimately national, system for detecting a change in habitat conditions at a land parcel level. The first stage of the project is focused on Yorkshire, UK, and therefore the dataset includes granules and scenes covering Yorkshire and surrounding areas only. The dataset contains Normalised Difference Water Index (NDWI) data derived from Defra and JNCC Sentinel-2 Analysis Ready Data.
NDWI files are generated for the following Sentinel-2 granules:
As the project continues, JNCC will expand the geographical coverage of this dataset and will provide continuous updates as ARD becomes available.
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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: 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 were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).
A representative subset of data are manually checked to ensure the indices files align with the ARD files, the value ranges are as expected, and the data format is correct. Data are as given by the data provider, no quality control has been performed by the Centre for Environmental Data Analysis (CEDA).
These data are provided in Cloud Optimized GeoTIFF (COG) format.
|JNCC 'Simple ARD Service' user guide|
|Sentinel 2 Multispectral Instrument (MSI)||Deployed on: Sentinel 2A|
|Sentinel 2 Multispectral Instrument (MSI)||Deployed on: Sentinel 2B|
Computation Element: 1
|Title||Computation for JNCC Sentinel-2 indices Analysis Ready Data (ARD) Normalised Difference Water Index (NDWI)|
|Abstract||All index equations from Sentinel-hub custom scripts (links in Related Documents). Sentinel-2 surface reflectance products are obtained from Defra and JNCC Sentinel-2 ARD CEDA dataset. ARD granules are masked using the corresponding cloud and topographic shadow masks. NDWI index files are then generated in R 3.6.1 using the raster::calc function.|