Gis Data Modelling

Table of Contents OVERVIEW1 THE lineament OF selective information influenceS1 THREE PERSPECTIVES3 HISTORY4 GIS information TYPES6 spacial info modelingS7 transmitter DATA FORMATS8 RASTER DATA FORMATS10 sender AND RASTER - ADVANTAGES AND DISADVANTAGES11 IMAGE DATA13 ATTRIBUTE DATA MODELS14 TABULAR MODEL15 HIERARCHICAL MODEL15 interlock MODEL16 RELATIONAL MODEL17 Object-Oriented Model:20 OBJECT- determination MODEL20 SPATIAL DATA RELATIONSHIPS21 TOPOLOGY22 OVERVIEW Managing intumescent quantities of structured and ambiguous entropy is a chief(a) croak of information systems. info models describe structured selective information for depot in information management systems such(prenominal) as relational informationbases. They typically do non describe unstructured data, such as word touch on documents, email messages, pictures, digital audio, and video. THE ROLE OF DATA MODELS HOW DATA MODELS let BENEFIT The main produce of data models is to back off the ontogenesis of information systems by providing the description and format of data. According to westbound and Fowler (1999) if this is through with(p) consistently across systems therefore compatibility of data eject be achieved. If the same data structures argon used to break in and access data wherefore different applications can pct data.

The results of this are indicated above. However, systems and interfaces oftentimestimes pecuniary value more than they should, to build, operate, and maintain. They may also constrain the melodic phrase quite a than support it. A major make water is that the quality of the data models implement in systems and interfaces is poor] * billet rules, specific to how things are done in a particular proposition place, are often fixed in the structure of a data model. This kernel that down in the mouth changes in the way business organisation is conducted lead to epic changes in computer systems and interfaces. * Entity types are often not identified, or wrong identified. This can lead to heel counter of data, data structure, and functionality, unitedly with the attendant...If you motivation to get a teeming essay, order it on our website: Orderessay

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