Each sample location (whether point or square) is called a cell, or pixel if the raster is an image. Each horizontal array of values (having the same y value) is called a row, and each vertical array (having the same x value) is called a column. In a grid, each value represents a summary of the values within a square, such as mean temperature. In a lattice, each value represents a measurement at a single point. The meaning of the sample measurement depends on which of two conceptual models the measurement framework may use. The raster logical model represents a single geographic phenomenon (usually, but not always a field) as a two-dimensional array of samples, usually at regular spacing in both the x and y directions.
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