ASIS: Vegetation Condition Index (VCI) - Monthly Summary (Global - Monthly - 1 Km)
The Vegetation Condition Index (VCI) evaluates the current vegetation health in comparison to the historical trends. The VCI relates current dekadal Normalized Difference Vegetation Index (NDVI) to its long-term minimum and maximum, normalized by the historical range of NDVI values for the same dekad. The VCI was designed to separate the weather-related component of the NDVI from the ecological element.
𝑉𝐶𝐼𝑖=(𝑁𝐷𝑉𝐼𝑖−𝑁𝐷𝑉𝐼𝑚𝑖𝑛) / (𝑁𝐷𝑉𝐼𝑚𝑎𝑥−𝑁𝐷𝑉𝐼𝑚𝑖𝑛)
Together with Temperature Condition Index (TCI), Vegetation Condition Index (VCI) is used to calculate Vegetation Health Index (VHI) using formula: VHI=0.5*VCI+0.5*TCI
In ASIS, VCI 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.).
Flags of raster file: 251=missing, 252=cloud, 253=snow, 254=sea, 255=background
More information, please visit FAO GIEWS Earth Observation website: https://www.fao.org/giews/earthobservation/index.jsp?lang=en
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 )
-
- Countries
- Continents
- Global
- Continents, countries, sea regions of the world. ( Place )
-
- Continents
- Use constraints
- License
- Other constraints
- Data license policy: 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/srv/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 degree
- Dimension name
- Column
- Dimension size
- 40320
- Resolution
- 0.00892857143 degree
- Cell geometry
- Area
- Transformation parameter availability
- No
- Distribution format
-
-
Tiff
(
)
-
Tiff
(
)
- OnLine resource
-
Global Vegetation Condition Index monthly map
(
WWW:LINK-1.0-http--link
)
Global Vegetation Condition Index monthly map
- OnLine resource
-
VCI_M:MONTH:MONTH
(
OGC:WMS-1.3.0-http-get-capabilities
)
Vegetation Condition Index (Monthly)
Data quality info
gmd:MD_Metadata
- File identifier
- a8a2be3f-0420-4b32-b583-17de83879713 XML
- Metadata language
- en
- Character set
- UTF8
- Parent identifier
- Agricultural Stress Index System (ASIS) f87f0320-d5b6-4cb5-b258-27b042952e86
- Date stamp
- 2022-10-27T13:18:39
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0
Overviews
![overview](https://data.apps.fao.org:/map/catalog/srv/api/records/a8a2be3f-0420-4b32-b583-17de83879713/attachments/vci_m.png)
Spatial extent
![thumbnail](https://data.apps.fao.org:/map/catalog/srv/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/srv/../images/logos/d5a5b43b-6e52-4ec6-94af-f95c6e4dac24.png)