Neighborhood operations: These operations involve analyzing the values of cells in the vicinity of a particular cell.These are some examples of the operations that are best suited to raster data. More information on the fundamentals for raster data here Spatial Processes for Raster and Vector Typical Raster Spatial Processes Depending on the phenomenon being represented the cell value can either represent the central value or represent the entire area covered by the cell. The cell value can either be a positive or a negative integer, a floating point value, or a NoData value to represent the absence of information. Each cell stores a value representing the information being portrayed by the raster data. Raster data on the other hand represents a phenomenon as a collection of pixels in rows and columns. On the other hand, a polygon is formed if the last vertex and the first vertex occupy the same location. A polyline consists of several lines connected. Polylines are formed where the last vertex and the first vertex are not occupying the same location. A line is formed by two vertexes connected. Two or more vertexes representing a specific position in space using coordinates are combined to form geometry.Ī vertex existing alone represents a point, while two or several vertexes connected form either a polyline or a polygon feature. Vector data represent features using geometry(Geometry according to the oxford dictionary is a shape and relative arrangement of parts of something). What is the Difference Between Vector and Raster Data Formats? If there is anything the maps above should tell you is that both data types do a good job of representing geographical data. The second one is a raster satellite image representation of the same area with additional labels. The first map is composed of vector layers representing different features put together to form a map with labels. The figures below show a representation of the same geographical location. The two data types are very different in their internal representation, the operations you can do on them as well as their look and feel. Geospatial data can be represented using either vector data type or raster. In this article, we will cover the fundamental differences between raster and vector data. The Difference between Vector and Raster Data in GIS
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