ASIS: Agricultural Stress Index (ASI) - Annual Summary (Global - Annual - 1 Km)
The Agricultural Stress Index (ASI) is a quick-look indicator that facilitates the early identification of cropped land with a high likelihood of water stress (drought). ASI related products (maps, spatial aggregation based on administrative unit) are processed by FAO GIEWS (Global Information and Early Warning System on Food and Agriculture) every 10 days.
ASI Annual Summary is processed at the end of crop season. It depicts the percentage of arable land, within an administrative area, that has been affected by drought conditions over the entire cropping season. It differs from ASI dekadal product, which is based on conditions from the start of the season up to the current dekad.
The Index is based on the integration of the Vegetation Health Index (VHI) in two dimensions that are critical in the assessment of a drought event in agriculture: temporal and spatial. The first step of the ASI calculation is a temporal averaging of the VHI, assessing the intensity and duration of dry periods occurring during the crop cycle at the pixel level; this calculation includes the use of crop coefficients, which introduces sensitivity of a crop to water stress during each phenological phase. The second step determines the spatial extent of drought events by calculating the percentage of pixels in arable areas with a VHI value below 35 percent (this value was identified as a critical threshold in assessing the extent of drought in previous research by Kogan, 1995). Each administrative area is classified according to the percentage of the affected area to facilitate the quick interpretation of results.
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 )
- 2014-01-01
- 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
- 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
-
Agricultural Stress Index
(
WWW:LINK-1.0-http--link
)
Agricultural Stress Index maps (annual summary)
- OnLine resource
-
ASI_A:YEAR:YEAR
(
OGC:WMS-1.3.0-http-get-capabilities
)
Agricultural Stress Index (Annual)
Data quality info
gmd:MD_Metadata
- File identifier
- 2afba815-0402-400a-bcf8-cf0959f19421 XML
- Metadata language
- en
- Character set
- UTF8
- Parent identifier
- Agricultural Stress Index System (ASIS) f87f0320-d5b6-4cb5-b258-27b042952e86
- Date stamp
- 2022-10-27T13:00:46
- Metadata standard name
- ISO 19115:2003/19139
- Metadata standard version
- 1.0