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MAP LAYERS - MAP LAYERS the data for an area can be...

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MAP LAYERS the data for an area can be visualized as a set of maps of layers o a map layer is a set of data describing a single characteristic for each location within a bounded geographic area only one item of information is available for each location within a single layer - multiple items of information require multiple layers o on the other hand, a topographic map can show multiple items of information for each location, within limits e.g. elevation (contours), counties (boundaries), roads, railroads, urbanized areas (grey tint) these would be 5 layers in a raster GIS typical raster databases contain up to a hundred layers o each layer (matrix, lattice, raster, array) typically contains hundreds or thousands of cells important characteristics of a layer are its resolution, orientation and zone(s) Resolution in general, resolution can be defined as the minimum linear dimension of the smallest unit of geographic space for which data are recorded
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