FAO Map Catalog
ASIS: Vegetation Health Index (VHI) - Monthly Summary (Global - Monthly - 1 Km)
The Vegetation Health Index (VHI) illustrates the severity of drought based on the vegetation health and the influence of temperature on plant conditions. The VHI is a composite index and the elementary indicator used to compute the seasonal drought indicators in ASIS: Agricultural Stress Index (ASI), Drought Intensity and Mean Vegetation Health Index (Mean VHI).
VHI combines both the Vegetation Condition Index (VCI) and the Temperature Condition Index (TCI). The TCI is calculated using a similar equation to the VCI, but relates the current temperature to the long-term maximum and minimum , as it is assumed that higher temperatures tend to cause a deterioration in vegetation conditions. A decrease in the VHI would, for example, indicate relatively poor vegetation conditions and warmer temperatures, signifying stressed vegetation conditions, and over a longer period would be indicative of drought.
In ASIS, VHI is computed in two modality: dekadal and monthly. The dekadal/monthly VCI raster layer published in Hand in Hand Geospatial platform is further updated in the following 5 dekads (improve data precision, remove cloud pixel etc.).
Simple
- Date ( Creation )
- 2014
- Purpose
- 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.
- Status
- On going
- Maintenance and update frequency
- Continual
- Maintenance and update frequency
- Continual
- Keywords ( Theme )
-
- Agricultural Drought
- Crop growing condition
- Early Warning System
- Vegetatation Index
- HiH_ASIS
- HiH_GIEWS_OB
- Keywords ( Place )
-
- Global, Countries
- Continents, countries, sea regions of the world. ( Place )
-
- Continents
- Access constraints
- Copyright
- Use constraints
- Copyright
- Other constraints
- Creative Commons Attribution- NonCommercial-ShareAlike 3.0 IGO (CC BY-NC- SA 3.0 IGO)
- Spatial representation type
- Grid
Spatial resolution
- Metadata language
- eng
- Character set
- UTF8
- Topic category
-
- Climatology, meteorology, atmosphere
- Farming
- Environment
- Geoscientific information
- Begin date
- 1984-01-01
))
- Supplemental Information
- No data value: -9999
- Reference system identifier
- EPSG:4326 - WGS84
- Number of dimensions
- 2
- Dimension name
- Row
- Dimension size
- 14673
- Resolution
- 0.00892857143 degree
- Dimension name
- Column
- Dimension size
- 40320
- Resolution
- 0.00892857143 degree
- Cell geometry
- Area
- Transformation parameter availability
- No
- Distribution format
-
-
PNG
(
)
-
PNG
(
)
- OnLine resource
-
Global Vegetation Health Index monthly map
(
WWW:LINK-1.0-http--link
)
Global Vegetation Health Index monthly map
- OnLine resource
-
VHI_M:MONTH:MONTH
(
OGC:WMS-1.3.0-http-get-capabilities
)
Vegetation Health Index (Monthly)
Data quality info
gmd:MD_Metadata
- File identifier
- 1eb5883d-05c6-427f-bbf7-8465bfb7069c XML
- Metadata language
- en
- Character set
- UTF8
- Parent identifier
- Agricultural Stress Index System (ASIS) f87f0320-d5b6-4cb5-b258-27b042952e86
- Date stamp
- 2021-07-16T09:18:02
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0
Overviews
Spatial extent
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