Due to ongoing delays in data access, Vegetation Health product images will now be updated each week on Thursdays until further notice. Thank you for your patience.

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STAR - Global Vegetation Health Products : Browse Archived Image of selected administrative region

Browse VIIRS Images by province :   Please select an Image Type, Region, Year and Week.

Year
Week

available images: VIIRS-NPP: since 2013 week 1,
NOAA-20: since 2021 week 28)

Click image to see map of the selected country (or international region).

World , Vegetation Health Index (VHI): Current Week and One Year Ago

VHI of current year
World , VHI of current year
animationcolor bar, file=../images/VH_colorbars/bar_VHI.png
VHI of previous year
World , VHI of previous year
animation

Vegetation Health index (VHI)

Global, 4 km, 7-day composite, validated. VHI=α *VCI + (1- α )*TCI, where α is a coefficient determining contribution of the two indices. VHI is a proxy characterizing vegetation health or a combine estimation of moisture and thermal conditions.VH (VHI, VCI, TCI) is used often to estimate crop condition and anticipated yield. If the indices are below 40 indicating different level of vegetation stress, losses of crop and pasture production might be expected; if the indices above 60 (favorable condition) plentiful production might be expected. VH (VHI, VCI, TCI) is very useful for an advanced prediction of crop losses.

Area without vegetation

For the area without vegetation (desert, high mountains, etc.), the displayed indices characterize surface conditions.

GIS information

GIS information of country/international regions and provinces were used for reference only. They were used "as it is" (without checking thier accurary), and there is no garantee they were updated. The sources of GIS related data were obtained from the following web sites:

  • Boundary of political regions:
    http://www.gadm.org/data/shp/*_adm.zip (GIS shape files)
  • names of cities:
    http://www.naturalearthdata.com/downloads/10m-cultural-vectors/10m-populated-places/
  • IGBP land type :
    http://edc2.usgs.gov/glcc/globdoc2_0.php (gigbp2_0ll.img.gz, resolution: 1km, lat/lon grid, 43200 x 21600)
  • Global Land One-kilometer Base Elevation (GLOBE) :
    http://www.ngdc.noaa.gov/mgg/topo/gltiles.html (provided as 16 tiles)

Week number in Vegeation Health Products

'week' defined here is based on 'day of the year', i.e. week 1 covers day-of-the-year 1 to 7. (for example, in 2016, images will be updated on Friday.)