- GIS PERFORM INTERSECT WITH VECTOR AND RASTER SOFTWARE
- GIS PERFORM INTERSECT WITH VECTOR AND RASTER CODE
- GIS PERFORM INTERSECT WITH VECTOR AND RASTER SERIES
As a result, raster systems have substantially more analytical power than their vector counterparts in the analysis of continuous space and are thus ideally suited to the study of data that are continuously changing over space such as terrain, vegetation biomass, rainfall and the like. However, the advantage of the raster data structure is that geographical space is uniformly defined in a simple and predictable fashion. Raster systems are typically data intensive (although good data compaction techniques exist) since they must record data at every cell location regardless of whether that cell holds information that is of interest or not. Vector and raster data can be represented as shown in Fig. Thus in a raster system, the data directly control the visible form we see. To make an image, the cell values in the data grid are used to regulate directly the graphic appearance of their corresponding pixels. Pixels can be made to vary in their colour, shape or grey tone. The term pixel is a contraction of picture element. In a raster display, such as the screen on your computer, there is also a grid of small cells called pixels. Although the data we store in these grid cells do not necessarily refer to phenomena that can be seen in the environment, the data grids themselves can be thought of as images - images of some aspect of the environment that can be made visible through the use of a raster display.
GIS PERFORM INTERSECT WITH VECTOR AND RASTER CODE
Each cell is given a numeric value which may then represent a feature identifier, a qualitative attribute code or a quantitative attribute value.įor example, a cell could have the value "6" to indicate that it belongs to District 6 (a feature identifier), or that it is covered by soil type 6 (a qualitative attribute) or that it is 6 meters above sea level (a quantitative attribute value). Rather, the study area is subdivided into a fine mesh of grid cells in which the condition or attribute of the earth's surface at each cell point is recorded. In fact, they typically do not define features at all. With raster systems, the graphic representation of features and the attributes they possess are merged into unified data files. The second major form of representation is known as raster. The link between these two data files can be a simple identifier number that is given to each feature in the map. For example, a vector map of property parcels might be tied to an attribute database of information containing the address, owner's name, property valuation and land use.
GIS PERFORM INTERSECT WITH VECTOR AND RASTER SOFTWARE
The attributes of features are then stored with a traditional database management (DBMS) software program. The points themselves are encoded with a pair of numbers giving the X and Y coordinates in systems such as latitude/longitude or Universal Transverse Mercator grid coordinates.
GIS PERFORM INTERSECT WITH VECTOR AND RASTER SERIES
With vector representation, the boundaries or the course of the features are defined by a series of points that, when joined with straight lines, form the graphic representation of that feature.
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