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The Spatial Production Allocation Model (SPAM) is an entropy based model which applies data fusion methods to plausibly assess cropping system distribution and performance globally at a meso-gridded scale of 5 deg minutes.
Graphical user interface was created by:
Jingyu Song, Nelson Villoria, Paul Preckel, Jaewoo Shin, Lan Zhao, Ulrike Wood-Sichra. (2014) "SPAM in the Clouds" https://mygeohub.org/resources/spam.
You, L., U. Wood-Sichra, S. Fritz, Z. Guo, L. See, and J. Koo. 2014. Spatial Production Allocation Model (SPAM) 2005 Beta Version.