栅格数据结构与矢量数据结构[理解、比较、转换]（Raster data structures and vector data structures [understanding, comparison, transformation]）.docVIP

栅格数据结构与矢量数据结构[理解、比较、转换]（Raster data structures and vector data structures [understanding, comparison, transformation]） The raster data structure and vector data structure [understanding, comparison, conversion of].txt as the day ideal setting for a couple in love, money under. Leaves the leaves, because the pursuit of the wind, or the tree does not retain? Kill the panda. Im the national treasure! Dont talk to me about ideals, quit! Raster data structures and vector data structures [understanding, comparison, transformation] 2007-8-10 editor: the glasses are missing and click into the forum raster data structure Raster structure is a data organization that expresses spatial objects or phenomena distribution by regular array. Each data in the organization represents the non geometric attributes of the objects or phenomena. The salient features of the grid structure: obvious attributes, positioning implicit, that is, the data directly records the attributes of the pointer or data itself, and where the location is based on the ranks of the corresponding coordinates. Raster data encoding method: direct trellis encoding, that is, the raster data as a data matrix, line by line (or column by column) to record the code one by one; compression coding, including Chain code (Freeman chain code) is more suitable for storing graphics data; Run length codes are implemented by recording code of the same number of adjacent attributes on rows or columns; Block codes are extended to two-dimensional codes with a length code, and a square area is used as the recording unit; Four tree encoding is one of the most efficient methods for raster data compression. It can also improve the efficiency of graphics operation with variable resolution. Vector data structure The vector data structure is to represent the geographic entities such as points, lines and polygons as accurately as possible by recording the coordinates. The coordinate space is continuous, allowing precise definition of any l