Gis Data Modelling

Table of Contents OVERVIEW1 THE lineament OF selective information influenceS1 THREE PERSPECTIVES3 HISTORY4 GIS information TYPES6 spacial information modelingS7 transmitter DATA FORMATS8 RASTER DATA FORMATS10 sender AND RASTER - ADVANTAGES AND DISADVANTAGES11 IMAGE DATA13 ATTRIBUTE DATA MODELS14 TABULAR MODEL15 HIERARCHICAL MODEL15 meshing MODEL16 RELATIONAL MODEL17 Object-Oriented Model:20 OBJECT- parting MODEL20 SPATIAL DATA RELATIONSHIPS21 TOPOLOGY22 OVERVIEW Managing intumescent quantities of structured and unregulated entropy is a essential croak of information systems. info models describe structured data for depot in data management systems such(prenominal) as comparative databases. They typically do not describe unstructured data, such as word bear upon documents, email messages, pictures, digital audio, and video. THE ROLE OF DATA MODELS HOW DATA MODELS portray BENEFIT The main bring about of data models is to shop the tuition of information systems by providing the chin-wagging and format of data. According to tungsten and Fowler (1999) if this is make consistently transversal systems therefore compatibility of data prat be achieved. If the same data structures argon used to blood and access data and so different applications can get by data.

The results of this are indicated above. However, systems and interfaces a great dealtimes financial value more than they should, to build, operate, and maintain. They whitethorn also constrain the handicraft quite a than support it. A major contract is that the quality of the data models enforced in systems and interfaces is poor] * cable rules, specific to how things are done in a picky place, are often frigid in the structure of a data model. This kernel that olive-sized changes in the way personal credit line is conducted lead to epic changes in computer systems and interfaces. * Entity types are often not identified, or wrongly identified. This can lead to tax return of data, data structure, and functionality, unitedly with the attendant...If you ask to get a secure essay, order it on our website: Ordercustompaper.com

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