Weighted Mean Vegetation Health Index (Weighted Mean VHI) Near Real Time (Global - Dekadal - 1 Km) - ASIS

The Weighted Mean Vegetation Health Index (Weighted Mean VHI) allows the user to assess the severity of the drought from the start of the growing season, examining the vegetation health and the influence of temperature on plant conditions.

The Weighted Mean VHI is an average of the dekadal VHI values over the crop growing season (from the start until the last dekad of analysis), weighted by crop coefficients (Kc), assigned to VHI values at the dekads corresponding to the Start of the Season (SOS), Maximum of the Season (MOS) and End of the Season (EOS). Crop coefficient is applied for the purpose of reflecting the crop’s water sensitivity at different phenology stages.

Two quick-look indicators in ASIS: Agricultural Stress Index (ASI) and Drought Intensity are both based Weighted Mean-VHI dataset.

For more information please visit FAO GIEWS Earth Observation website at: https://www.fao.org/giews/earthobservation/index.jsp?lang=en

Data creation: 2014-01-01

Supplemental Information:

No data value: -9999

Citation:

Recommended citation: © FAO - Agricultural Stress Index System (ASIS), http://www.fao.org/giews/earthobservation/, [Date accessed]

Contact points:

Resource Contact: Yanyun Li

Metadata Contact: Global Information and Early Warning System (GIEWS)

Resource constraints:

Data license policy: Creative Commons Attribution- NonCommercial-ShareAlike 3.0 IGO (CC BY-NC- SA 3.0 IGO)

Online resources:

Global Mean Vegetation Health Index (VHI) Dekadal map

Data and Resources

Graphic overview

Metadata:

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The Weighted Mean Vegetation Health Index (Weighted Mean VHI) allows the user to assess the severity of the drought from the start of the growing season, examining the vegetation health and the influence of temperature on plant conditions. The Weighted Mean VHI is an average of the dekadal VHI values over the crop growing season (from the start until the last dekad of analysis), weighted by crop coefficients (Kc), assigned to VHI values at the dekads corresponding to the Start of the Season (SOS), Maximum of the Season (MOS) and End of the Season (EOS). Crop coefficient is applied for the purpose of reflecting the crop’s water sensitivity at different phenology stages. Two quick-look indicators in ASIS: Agricultural Stress Index (ASI) and Drought Intensity are both based Weighted Mean-VHI dataset. For more information please visit FAO GIEWS Earth Observation website at: https://www.fao.org/giews/earthobservation/index.jsp?lang=en
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**Recommended citation**: © FAO - Agricultural Stress Index System (ASIS), http://www.fao.org/giews/earthobservation/, [Date accessed]
title
Weighted Mean Vegetation Health Index (Weighted Mean VHI) Near Real Time (Global - Dekadal - 1 Km) - ASIS
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    • Agricultural Drought
    • Crop growing condition
    • Early Warning System
    • Vegetatation Index
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FAO Global Information and Early Warning System on Food and Agriculture (GIEWS) monitors the condition of major foodcrops across the globe to assess production prospects. To support the analysis and supplement ground-based information, GIEWS utilizes remote sensing data that can provide a valuable insight on water availability and vegetation health during the cropping seasons. In addition to rainfall estimates and the Normalized Difference Vegetation Index (NDVI), GIEWS and FAO's CBC Division have developed the Agricultural Stress Index (ASI), a quick-look indicator for the early identification of agricultural areas probably affected by dry spells, or drought in extreme cases. The ASI dissemination system was online in 2014.
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Additional Info

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Source Source URL
Last Updated August 1, 2023, 08:01 (UTC)
Created May 20, 2022, 09:16 (UTC)