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By Bradford Mills

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Thus, an elevation image of 1000 rows by 600 columns contains 600,000 individual pixels. Each has its own value in, for example, meters of the geographic area that the pixel represents. The image is depicted on the screen or on a printed raster map by assigning colors to specific values or ranges of the thematic variables. Since each thematic image (equivalent to one computer file) must contain a numeric value for each pixel, it is not possible to visually overlay these images in the same way as vector files.

These areas also face the challenge of maintaining the soil base under continuous cultivation, although with more available biomass. Higher elevation areas show a less uniform distribution of population density. As mentioned, these areas were developed as large-scale farm enterprises during the colonial era. Many large farms have been subdivided in the post-colonial era to produce the current mix of high and medium population density areas. Chapter 10 discusses further the priority-setting exercise of the soil fertility and plant nutrition research program.

These are research themes. Themes must not, however, be defined too broadly, or evaluation of their potential impact becomes very difficult. An examination of the outputs associated with a theme can help managers judge whether a theme is too broadly or narrowly defined. If a theme has a number of outputs that are only loosely related, the theme can most likely be subdivided into sets of activities with more sequentially related sets of outputs. On the other hand, if the theme 48 Patrick Audi and Bradford Mills yields an output, or a collection of several outputs, which by themselves are unlikely to result in an impact at the farm level, then the theme may be too narrowly defined.

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