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.

Simple

Date ( Creation )
2014
Identifier
https://data.apps.fao.org/map/catalog/933ba8dd-1eb7-4a2c-95ab-240fad436c38
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
Originator
FAO - Global Information and Early Warning System (GIEWS) ( )
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

No information provided.
Metadata language
eng
Character set
UTF8
Topic category
  • Climatology, meteorology, atmosphere
  • Farming
  • Environment
  • Geoscientific information
Begin date
1984-01-01
N
S
E
W
thumbnail


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 ( )

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

No information provided.

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
2021-06-04T07:00:53
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
FAO - Global Information and Early Warning System ( )
 
 

Overviews

overview

Spatial extent

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S
E
W
thumbnail


Keywords

Agricultural Drought Crop growing condition Early Warning System HiH_ASIS HiH_GIEWS_OB Vegetatation Index

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