The grid is then divided up into smaller squares called tiles, which are divided up into blocks, and then cells, creating a grid pattern. Many other shapes have been used in place of squares. Tessellation shape can vary, however, and the choice of shape is dependent on a variety of other factors (e.g., distance calculations). The process of representing data in this structure is called a tessellation and is commonly represented as a square with similar x and y dimensions.
#DEFINE RASTER SOFTWARE#
DTM mapping software stores data in the form of a ‘hierarchical tile-block structure’ that uses the grid cell as its foundation ( El-Sheimy et al., 2005). Many current software packages possess algorithms to rapidly produce surface measures from raster datasets.
Raster data are commonly used in geomorphology because they require less physical storage space. This simple data structure is based on a 2D matrix containing x and y coordinates, which are gathered at regular intervals to produce a grid pattern of square-shaped cells ( Kidner and Smith, 1993 El-Sheimy et al., 2005 Maune et al., 2007). Raster files are the most common data structure used by geomorphologists for terrain analysis. Oguchi, in Treatise on Geomorphology, 2013 3.6.3.3.1 Raster (grid)
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