JNCC Sentinel-2 indices Analysis Ready Data (ARD) Enhanced Vegetation Index (EVI)
EVI is a development on Normalised Difference Vegetation Index (NDVI).
Sentinel-Hub EVI description:
In areas of dense canopy cover, where leaf area index (LAI) is high, the blue wavelengths can be used to improve the accuracy of NDVI, as it corrects for soil background signals and atmospheric influences. The range of values for EVI is -1 to 1, with healthy vegetation generally around 0.20 to 0.80.
EVI is calculated: EVI = 2.5 * ((NIR – RED) / ((NIR + (6 * RED) – (7.5 * BLUE)) + 1))
Sentinel 2 EVI = 2.5 * ((B8 – B4) / ((B8 + (6 * B4) – (7.5 * B2)) + 1))
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 Enhanced Vegetation Index data derived from Defra and JNCC Sentinel-2 Analysis Ready Data.
EVI 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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|Previously used record identifiers:||
No related previous identifiers.
These data have been removed (see lineage statement for details).
Data were produced by the project team and supplied for archiving at the Centre for Environmental Data Analysis (CEDA).
2023-02-10 These data were removed for the following reason: These data have been removed due to errors in the processing. At present there are no plans to replace them.
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) Enhanced Vegetation Index (EVI)|
|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. EVI index files are then generated in R 3.6.1 using the raster::calc function.|