7-day change in Vegetation Health Index - Kent (UK), 2022

Demonstration Case Name

Multi-hazards in the Southeast UK region

Dataset Title

7-day change in Vegetation Health Index - Kent (UK), 2022

Dataset Description

This dataset consists of:

• NESDIS_STAR_7day_VHI_Kent2022_1km.tif a multi-layer (52-band) image where each layer represents the 7-day Vegetation Health Index (VHI) in 2022 for the wider Kent region in Southeast UK.
• NESDIS_STAR_7day_change_VHI_Kent2022_1km.tif: a multi-layer (51-band) image where each layer represents the 7-day change in Vegetation Health Index (VHI) in 2022 for the wider Kent region in Southeast UK.

Data was generated using code developed within the Google Earth Engine online platform and output in GeoTIFF formats for interoperability and comparative analysis within GIS.

Key Methodologies

Calculation of pixel threshold where the 7-day change in vegetation health index is negative (declining) or positive (improving) over each 7-day window in the NESDIS STAR Vegetation Health Index dataset (https://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/vh_ftp.php), calculated across the 2022 multi-date image stack. Data extracted from source then imported and analysis coded into Google Earth Engine online platform. Output in raster format.

Temporal Domain

Daily: 7th January 2022 to 31st December 2022 (7-day temporal resolution)

Spatial Domain

Geographic extent covering the region of Kent, Southeast UK.

Projected Coordinate System: British National Grid (EPSG:27700)

Spatial Extent Bounding Box: Upper Left (182000N, 509000E), Lower Right (95000N, 641000E)

Spatial Resolution: 1km x 1km (resampled from original 4km data in GEE)

Key Indicators

7-day image stack indicating where pixels indicate a decline (-) or improvement (+) in vegetation health, the decline associated with preconditioning for high heat events.

Data Format

GeoTIFF (*.tif)

Source Data

Primary source: National Oceanic and Atmospheric Administration (NOAA) National Environmental Satellite, Data, and Information Service (NESDIS) Center for Satellite Application and Research (STAR) Vegetation Health Index dataset (https://www.star.nesdis.noaa.gov/smcd/emb/vci/VH/vh_ftp.php), extracted and coded into the Google Earth Engine online platform (GEE).

Accessibility

10.5281/zenodo.17131655

Stakeholder Relevance

Urban planning departments
Emergency response organizations
Infrastructure development teams
Disaster risk assessment analysts

Limitations/Assumptions

Original spatial resolution of data 4km (GeoTIFF).

Additional Information

Technical specifications: GeoTIFF format require use of a multi-band image visualisation package

Pixel values represent the 7-day decline (-) or improvement (+) in vegetation health within that pixel.

Contact Information

kmcm@bgs.ac.uk