![]() For example, orthoimages displayed underneath other GIS layers provide the map user with confidence that map layers are spatially aligned and represent real objects, as well as additional information. Within a GIS, the uses of raster data fall under four main categories:Ī common use of image data in a GIS is as a background display for other feature layers. While the structure of raster data is simple, it is exceptionally useful for a wide range of applications. Picture rasters are often used as attributes in tables-they can be displayed with your geographic data and are used to convey additional information about map features. Pictures include scanned maps or drawings and building photographs.Ĭontinuous and thematic rasters may be displayed as data layers along with other geographic data on your map but are often used as the source data for spatial analysis with the ArcGIS Spatial Analyst or ArcGIS Image Analyst extension.Thematic data (also known as discrete) represents features such as land use or soils data. ![]() Continuous data represents phenomena such as elevation and spectral image data collected from satellites and airborne platforms such as drones.Rasters are digital aerial photographs, imagery from satellites, digital pictures, or even scanned maps.ĭata stored in a raster format represents real-world phenomena: In its simplest form, a raster consists of a matrix of cells (or pixels) organized into rows and columns (or a grid) where each cell contains a value representing information, such as temperature. ![]()
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