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Dataset

 

JNCC Sentinel-2 indices Analysis Ready Data (ARD) Normalised Difference Water Index (NDWI)

Status: Ongoing
Online Status: ONLINE
Publication State: Published
Publication Date: 2022-05-11
Download Stats: last 12 months

Abstract

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:
• T30UWE
• T30UXF
• T30UWF
• T30UXE
• T31UCV
• T30UYE
• T31UCA

As the project continues, JNCC will expand the geographical coverage of this dataset and will provide continuous updates as ARD becomes available.

Citable as:  Joint Nature Conservation Committee (2022): JNCC Sentinel-2 indices Analysis Ready Data (ARD) Normalised Difference Water Index (NDWI). NERC EDS Centre for Environmental Data Analysis, date of citation. https://catalogue.ceda.ac.uk/uuid/b42f524bc9cd4dd6850b2399b616f5c4
Abbreviation: Not defined
Keywords: JNCC, ARD, NDWI, Sentinel 2, EO indices, Analysis Ready Data, Sentinel

Details

Previous Info:
No news update for this record
Previously used record identifiers:
No related previous identifiers.
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: 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:
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).
File Format:
These data are provided in Cloud Optimized GeoTIFF (COG) format.

Process overview

This dataset was generated by a combination of instruments deployed on platforms and computations as detailed below.

Instrument/Platform pairings

Sentinel 2 Multispectral Instrument (MSI) Deployed on: Sentinel 2A

Instrument/Platform pairings

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.
Input Description None
Output Description None
Software Reference None
Output Description None
Output Description None

No variables found.

Coverage
Temporal Range
Start time:
2015-07-12T00:00:00
End time:
Ongoing
Geographic Extent

 
59.4800°
 
-10.8500°
 
2.0200°
 
49.8200°