GAEZ - Global Agro-Ecological Zones

Actual Yields and Production

Two main activities were involved in obtaining grid-cell level area, yield and production of prevailing main crops:
1. Estimation of shares of rain-fed or irrigated cultivated land by 5’ grid cell, and
2. Estimation of area, yield and production of the main crops in the rain-fed and irrigated cultivated land shares.

Estimation of cultivated land shares

Estimation of cultivated land shares

Land cover interpretations schemes were devised that allow a quantification of each 5 arc-minute. grid-cell into seven main land use/land cover shares. These shares are: cultivated land, subdivided into (i) rain-fed and (ii) irrigated land, (iii) forest, (iv) pasture and other vegetation, (v) barren and very sparsely vegetated land, (vi) water, and (vii) urban land and land required for housing and infrastructure.An iterative calculation procedure has been implemented to estimate land cover class weights, consistent with aggregate FAO land statistics and spatial land cover patterns obtained from remotely sensed data, allowing the quantification of major land use/land cover shares in individual 5’ by 5’ latitude/longitude grid cells. The class weights define for each land cover class the contents in terms of respectively cultivated land and forest. Starting values of class weights used in the iterative procedure were obtained by cross-country regression of statistical data of cultivated and forest land against aggregated national land cover class distributions obtained from GIS.

Allocation of agricultural statistics to cultivated land

Allocation of agricultural statistics to cultivated land

Agricultural production data are available at national scale from FAO. A downscaling method in this case has to achieve a plausible allocation of aggregate statistical national production values to individual grid cells by using available spatial information.
Spatial information available for each country is used to calculate an initial estimate of crop-wise production prior. The prior is subsequently revised in an iterative procedure to ensure that crop distribution and production is consistent with aggregate statistical data, is allocated to the available cultivated land, and is in agreement with ancillary data, e.g., selected crop area distribution data and AEZ crop suitability layers.

Aggregate crop yield in 2000

Aggregate crop yield in 2000, © Fao


Rice terraces. Indonesia. ©FAO/Roberto Faidutti / FAO
Dominant land cover pattern. GAEZ. ©FAO/IIASA
Input supply to vulnerable populations under the ISFP. Kenya. ©FAO/Sarah Elliott / FAO
Thermal zones. GAEZ. ©FAO/IIASA
Close up of apples, limes, oranges and tomatoes on sale at a local market in Nepal. ©FAO/Giampiero Diana / FAO
Aggregate crop yield in 2000. GAEZ. ©FAO/IIASA
Harvesting rice in east Java. Indonesia. H. Null / FAO
Dominant land cover pattern. GAEZ. ©FAO/IIASA
Flood recession rice fields. Cambodia. ©FAO/ Giuseppe Bizzarri/ FAO
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