Geographic Data Raster data consist of bit maps or pixel maps,in two or more dimensions. Example 2-D raster image:satellite image of cloud cover, where each pixel stores the cloud visibility in a particular area. Additional dimensions might include the temperature at different altitudes at different regions,or measurements taken at different points in time. Design databases generally do not store raster data. 14 Database System Concepts,5th Ed. 24.14 ©Silberschat乜，Korth and SudarshanDatabase System Concepts, 5 24.14 ©Silberschatz, Korth and Sudarshan th Ed. 14 Geographic Data Raster data consist of bit maps or pixel maps, in two or more dimensions. Example 2-D raster image: satellite image of cloud cover, where each pixel stores the cloud visibility in a particular area. Additional dimensions might include the temperature at different altitudes at different regions, or measurements taken at different points in time. Design databases generally do not store raster data