ASIS: Weighted Mean Vegetation Health Index (Mean VHI) - Annual Summary (Global - Annual - 1 Km)
The Weighted Mean Vegetation Health Index (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. It 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.
Weighted Mean VHI Annual Summary is processed at the end of crop season. It allows the user to assess the overall severity of drought for an entire growing season.
Two quick-look indicators in ASIS: Agricultural Stress Index (ASI) and Drought Intensity are both based Mean-VHI dataset.
More information please visit FAO GIEWS Earth Observation website: https://www.fao.org/giews/earthobservation/index.jsp?lang=en
Data license policy: Creative Commons Attribution- NonCommercial-ShareAlike 3.0 IGO (CC BY-NC- SA 3.0 IGO)
Recommended citation: © FAO - Agricultural Stress Index System (ASIS), http://www.fao.org/giews/earthobservation/, [Date accessed]
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
- 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
- Use constraints
- License
- 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
![thumbnail](https://data.apps.fao.org:/map/catalog/static/api/regions/geom.png?geomsrs=EPSG:4326&geom=POLYGON((179.995536 -56.0044643,179.995536 75.0044643,-180.004464 75.0044643,-180.004464 -56.0044643,179.995536 -56.0044643)))
- 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 DecimalDegree
- Dimension name
- Column
- Dimension size
- 40320
- Resolution
- 0.00892857143 DecimalDegree
- Cell geometry
- Area
- Transformation parameter availability
- No
- Distribution format
-
-
Tiff
(
)
-
Tiff
(
)
- OnLine resource
-
Agricultural Stress Index
(
WWW:LINK-1.0-http--link
)
Agricultural Stress Index maps (annual summary)
- OnLine resource
-
MVHI_A:YEAR:YEAR
(
OGC:WMS-1.3.0-http-get-capabilities
)
Mean Vegetation Health Index (Annual)
Data quality info
gmd:MD_Metadata
- File identifier
- c3b9f688-e97d-4086-ae7b-823d2c557958 XML
- Metadata language
- en
- Character set
- UTF8
- Parent identifier
- Agricultural Stress Index System (ASIS) f87f0320-d5b6-4cb5-b258-27b042952e86
- Date stamp
- 2022-12-13T14:32:24
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0
Overviews
![overview](https://data.review.fao.org:/map/catalog/srv/api/records/2afba815-0402-400a-bcf8-cf0959f19421/attachments/oy18h_aC1_s1_g2.png)
Spatial extent
![thumbnail](https://data.apps.fao.org:/map/catalog/static/api/regions/geom.png?geomsrs=EPSG:4326&geom=POLYGON((179.995536 -56.0044643,179.995536 75.0044643,-180.004464 75.0044643,-180.004464 -56.0044643,179.995536 -56.0044643)))
Provided by
![logo](https://data.apps.fao.org:/map/catalog/static/../images/logos/d5a5b43b-6e52-4ec6-94af-f95c6e4dac24.png)