Input

A more thorough explanation of data inputs and outputs is available in “Methodology,” but below is a brief list of datasets that go into SPAM 2000:

• Sub-national production statistics for 20 crops
• Land-cover / Land-use
• Crop suitability
• Input systems – three levels: Irrigated, Rainfed high-input/commercial, and Rainfed low-input/subsistence
• Population density
• Accessibility

Output

Resulting four variables, per crop, per input system:

• Harvested Area (hectares)
• Physical Area (hectares)
• Production (Tons)
• Yield (Kilograms / hectare)

Browse Maps

Browse, interact and download SPAM in a variety of ways:

• Browse crop-specific maps per variable (harvested area, physical area, production, and yield)
• Explore results per pixel using the Droppr tool
• Compare results across administrative units with tables
• Download results yourself

To view fullscreen, select map icon from Box, then from Menu button in top right, click “Preview Increo”

Harvested Area

Amount of area where a specific crop in a given input system is being cultivated and harvested in the year 2000 (average 1999 – 2001). If a crop is being harvested more than once, the harvested area increases as well. Data for harvested area is collected at national and sub-national level for all SPAM crops. Harvested area is expressed in hectare.

Physical Area

Area where a specific crop in a given input system is being cultivated in the year 2000. Multiple harvesting seasons in one year are not taken account of. Intercropping or successive planting of different crops on the same physical area do not increase the physical area. Cropping intensity factors convert harvested area into physical area.
Physical area is expressed in hectare.

Production

Production of a specific crop in the given input system. Production is calculated by multiplying harvested area by yield. Since harvested area and yield refer to the year 2000, so does production. Production is expressed in metric tonns.

Yield

The yield of a crop in the given input system is the amount of production per harvested area.Yields are given for the year 2000. Yield data is collected at national and sub-national level for all SPAM crops. Yield is expressed in kilogramme per hectare.

Results by Pixel

Droppr mashup provides results per pixel

We anticipate the richness of SPAM database can soon motivate further development of other relevant studies, databases, and tools. A tool shown in this page is one example taking full advantage of SPAM. This tool, called Droppr, is a Google Maps mashup application, developed by Jawoo Koo (HarvestChoice/IFPRI), providing an easy-to-use interface for users to explore spatially-explicit databases. Just drag-and-drop the red marker, then a summary table of SPAM’s four variables for 20 crops will be displayed. Clicking on each column heading of the table will sort the table in ascending or descending order. The map overlays the intensity of the 20 crops in each pixel, which is the percentage of area physically covered by the crops being modeled by SPAM. The opacity of the overlaid layer on the map can be adjusted by drag-and-moving the slider bar under the map. Let us know if you have a good idea to mashup SPAM!

Results by Admin Unit

Tabulation

Harvest Area

Yield