This is a note to self
Every time I go to use the FAO data on agricultural suitability, I forget how to access it and then how to work with it. Follow these notes.
Getting the data from FAO
- The data portal is located at http://gaez.fao.org/Main.html. You have to log in, but your google or facebook accounts will work.
- Within the “Suitability and Potential Yield” category, choose “Agro-climatic yield”. Then, use the input level, crop, and water supply levels (on the bottom left of the screen) to choose the right historical period.
- For time, I usually pick “Baseline (1961-1990)” which is as good as we’re going to get for historical climate data.
- Input level depends on the historical period. For the Domesday paper on 13th century England, I use low inputs and rain-fed water supply.
- Theme options are: “Agro-climatically attainable yield”, “Crop/LUT selection by grid-cell”, “Crop-specific actual evapotranspiration (mm)”, and “Crop specific accumulated temperature”. The first seems the right choice for suitability.
- Then pick the crop (or crops)
- Once selected, double click the small map and save it by clicking the zip file icon. This will download a file with:
- a tif file, a pdf of the map, an xml, two pngs, and a csv with the region aggregates
Loading the data in R
This post has a lot of nice tips: http://zevross.com/blog/2015/03/30/map-and-analyze-raster-data-in-r/.
- I collect suitability data using:
- low inputs
- rain-fed water
- baseline time
- agro-climatically attainable yields
- For the following crops
- barley, oats, legumes, wheat, and rye
- what are legumes?