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...ltural land.swill increase. For SSA, medium- to high-resolution land cover datasets are available from three (global data) sources: NOAA-AVHRR (Hansen et al. 2000; Loveland et al. 2000), TERRA-MODIS (=-=Friedl et al. 2002-=-), and SPOT-VEGETATION (JRC 2003). Each land cover dataset has its own pros and cons, and some researchers (e.g., Jung et al. 2006) are exploring the option of merging individual remote sensing produc...

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...ly important from a crop production perspective, obtaining a better understanding of the spatial patterns of crop production systems should allow better targeting of related policies and investments (=-=Wood et al. 1999-=-). In addition, such spatially explicit insights are needed to assess the potential human welfare and natural resource impacts of muchneeded improvements in crop productivity. Thankfully, the increase...

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...Judge and Miller (1996), numerous groups have sought to apply the entropy approach to various estimation problems (Lencer and Miller 1998; Paris and Howlitt 1998; Robinson, Cattaneo and El-Said 2000; =-=Zhang and Fan 2001-=-). A unique feature of the entropy approach is its ability to overcome two empirical problems that hamper 15straditional econometrics: multi-collinearity and ill-posed problems (particularly due to un...

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...h the selection, productivity, and profitability of various crops in different locations are linked to the distance to product markets (von Thunen 1966), marketrelated transactions costs (Jayne 1994, =-=Omamo 1998-=-, Obare et al. 2003, Renkow et al. 2004), and a wide range of market imperfections (Kherallah et al. 2000). Furthermore, since many subsistence households are also net buyers of food staples, these fa...

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...pective. To fill these disaggregated data gaps, we previously developed a meso-scale model for the spatial allocation of crop production and applied this model to data from Brazil (You and Wood 2003, =-=You and Wood 2006-=-). Using a crossentropy approach, our spatial allocation model allows us to spatially disaggregate crop statistics to individual pixels within the larger geopolitical units for which the statistics ar...

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...NOAA-AVHRR (Hansen et al. 2000; Loveland et al. 2000), TERRA-MODIS (Friedl et al. 2002), and SPOT-VEGETATION (JRC 2003). Each land cover dataset has its own pros and cons, and some researchers (e.g., =-=Jung et al. 2006-=-) are exploring the option of merging individual remote sensing products in order to provide high-quality, integrated land cover datasets. For our present purposes, data availability is a factor in ch...

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...ities for researchers to help meet these needs. Recently, numerous agricultural economists have extended their analytical methods to capitalize on more disaggregated production insights (Nelson 2002; =-=Staal, et al. 2002-=-; Luijten 2003; Bell and Irwin 2002; Anselin 2002). The ideal scenario would be for consistent, highly disaggregated production data to be made available through national statistical and survey agenci...

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...ket access and transactions costs, since higher population densities imply higher access to markets and lower transaction costs. This use of population density has been established in the literature (=-=Deichmann 1996-=-, CIESIN, IFPRI and WRI 2000). The Gridded Population of the World (GPW) Version 2 provides global estimates of population counts and population densities (persons per square kilometer) for 1990 and 1...

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...r knowledge. Since the publication of the comprehensive book on this topic by Golan, Judge and Miller (1996), numerous groups have sought to apply the entropy approach to various estimation problems (=-=Lencer and Miller 1998-=-; Paris and Howlitt 1998; Robinson, Cattaneo and El-Said 2000; Zhang and Fan 2001). A unique feature of the entropy approach is its ability to overcome two empirical problems that hamper 15straditiona...

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...he ‘very suitable,’ ‘suitable,’ ‘moderately suitable,’ and ‘marginally suitable’ classes in the AEZ model. The yield is then calculated as the area-weighted average of these four suitability classes (=-=FAO 1981-=-). Some crops have many types, 3 There three types correspond to the three production patterns defined on page 8. The forth one, subsistence, always corresponds to low-input rainfed production. 12ssuc...

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...ion, productivity, and profitability of various crops in different locations are linked to the distance to product markets (von Thunen 1966), marketrelated transactions costs (Jayne 1994, Omamo 1998, =-=Obare et al. 2003-=-, Renkow et al. 2004), and a wide range of market imperfections (Kherallah et al. 2000). Furthermore, since many subsistence households are also net buyers of food staples, these factors are also impo...

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...tment planning perspective. To fill these disaggregated data gaps, we previously developed a meso-scale model for the spatial allocation of crop production and applied this model to data from Brazil (=-=You and Wood 2003-=-, You and Wood 2006). Using a crossentropy approach, our spatial allocation model allows us to spatially disaggregate crop statistics to individual pixels within the larger geopolitical units for whic...

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...and yields of both rainfed and irrigated production of crops by country that, when aggregated, are consistent with FAO-published national average areas and yields for the entire national crop output (=-=Bruinsma 2000-=-); and the authors’ compilation and interpretation of a wide range of other background data (e.g. farm size structure, adoption of modern varieties, and fertilizer use) that provide insights into the ...