![]() Scale refers to the level of detail displayed. The spatial resolution required depends on the type and scale of analysis, accuracy of the study and limitations such as time and data size. Spatial resolution refers to the cell size and determines the level of detail that will be included within the raster display. Raster data is composed of cells in a grid like structure. Raster data can be stored in various formats including DEM's (Digital Elevation Models), USGS, ESRI Grids, and image formats including JPEG, TIFF, IMG and GIF. Rasters can also be digital or scanned documents that can be used as attributes of a feature collected from a variety of sources such as aerial photography, satellite sensors, scanning maps, surveying, and from converting vector to raster data. Raster data tends to typically provide greater details, has a larger data volume and allows for more advanced analyses than vector data. These data models complement each other but can be converted if necessary using various conversion tools. Vector models serve as the other primary dataset used in ArcGIS. Vector data modelsrepresent discrete points, line and polygons that are not continuous in nature. ![]() The smaller the cell size, the greater the resolution and file size of the raster. temperature, elevation, land-use, soil type). Problem: Conversion techniques of vector data to raster data.Īnalysis Procedures: Raster data is a field based data model that represents geography as a continuum though using grid cells that store attribute values, but can also be used as discrete thematic rasters (i.e.
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