The Estimation System for agricultural Productivity (ESAP) model estimated the land productivity of agricultural ecosystem in China. The ESAP model is a collection of several applications, including ecosystem and land suitability assessment, and the evaluation of land productivity, and some advanced applications which use the stock of land resources as fundamental input information. The outputs from the ESAP model include agroecological zoning maps,suitability assessment maps, and attribute data such as cropping area and crop production. These outputs provide basic decision-making information for the assessment of land degradation, simulation of land productivity of land use system, assessment of land carrying capacity, and optimal allocation of regional land uses.
