Data Conversion

Spatial data recorded in GIS are divided into "Raster" and "Vector."

Raster data is spatial data represented with pixel array. Each pixel of the array contains attribute data and coordinates. In the vector structure, topology data is saved in a definite way. However, coordinates of spatial data in raster structure are implicit in the order of array. Regarding the attribute data, cells of the same attribute value will be considered an unique zone of same attribute data. The presentation of raster data is similar to the one of the real world. That¡¦s why raster data can record real condition of the real world.

Vector data indicates the spatial data with coordinates of points and Topology will be saved exactly during the process of data saving. Vector data presents the spatial data in the form of points, lines and polygons. Each point, line or polygon is composed of one or a series of coordinates. For example, a point means a coordinate, a line is composed of various related points and a polygon consists of closed lines. And the attribute table records the attribute data of the spatial data.

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