ELEMENTS OF THE RASTER DATA MODEL: -
There are three elements in a raster data model. Point, Line and Area.(i) Raster data represents points by single cells,.
(ii) Raster data represents lines by sequence of neighboring cells.
(iii) Raster data represents areas by collection of contiguous cell. Each cell in a grid carries a value either an integer or a floating value. Integer cell values typically represent categorical data for Ex- A land cover model may use 1 for forest, 2 for water body, 3 for built-up area and so on. Floating point cell value represents continuous data. For ex- A precipitation model may have precipitation values of 2.5, 30.6 and so on. A floating-point grid requires more computer memory than an integer grid.
