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Tuesday Term of the Week | Grid

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In GIS terms, a Grid refers to a regular unit of area on a map which is usually square or rectangular in shape.  Grid lines are typically drawn based on the coordinate system used by the map, often ranges of latitude and longitude for example.  The intersections of the horizontal and vertical grid lines form a series of cells.  Grid cells can contain a numeric value that represents a geographic attribute – such as the population density, tax rate or average elevation – for that unit of area.  By taking any point on the map and measuring the distance from the nearest horizontal and vertical grid lines using a ruler, the x-y coordinate of the point can be interpolated and calculated.

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