Specifically, resolution is determined by measuring one side of the square pixel. The area covered by each pixel determines the spatial resolution of the raster model from which it is derived. Therefore, the more area covered per pixel, the less accurate the associated data values. The raster model will average all values within a given pixel to yield a single value. The advance of computer technology has made this second methodology increasingly feasible as large datasets are no longer constrained by computer storage issues as they were previously. Alternatively, the raster graphic can reference a database management system wherein open-ended attribute tables can be used to associate multiple data values to each pixel. The data type for that cell value can be either integer (whole number) or floating-point (decimals). Each cell in a raster carries a single value, which represents the characteristic of the spatial phenomenon at a location denoted by its row and column. Typically, a single data value will be assigned to each grid locale. Geological Survey, Earth Resources Observation and Science (EROS) Center, Sioux Falls, SD.īecause of the reliance on a uniform series of square pixels, the raster data model is referred to as a grid-based system.
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