Gis Data Modelling

Table of Contents OVERVIEW1 THE lineament OF selective in dression influenceS1 triplet PERSPECTIVES3 HISTORY4 GIS entropy TYPES6 SPATIAL selective information modelingS7 vector selective information FORMATS8 RASTER DATA FORMATS10 VECTOR AND RASTER - ADVANTAGES AND DISADVANTAGES11 IMAGE DATA13 ATTRIBUTE DATA MODELS14 TABULAR MODEL15 class-conscious MODEL15 NETWORK MODEL16 RELATIONAL MODEL17 Object-Oriented Model:20 OBJECT-ROLE MODEL20 SPATIAL DATA RELATIONSHIPS21 TOPOLOGY22 OVERVIEW Managing intumescent quantities of structured and unstructured entropy is a primary buy the farm of information systems. Data models describe structured info for end point in entropy management systems such(prenominal) as relational informationbases. They typically do not describe unstructured data, such as word processing documents, email messages, pictures, digital audio, and video. THE ROLE OF DATA MODELS HOW DATA MODELS DELIVER BE NEFIT The main acquire of data models is to support the development of information systems by providing the comment and format of data. According to West and Fowler (1999) if this is done consistently crosswise systems thereof compatibility of data can be achieved. If the same data structures are used to store and access data then contrary applications can share data.

The results of this are indicated above. However, systems and interfaces oftentimes monetary harbor more than they should, to build, operate, and maintain. They may also constrain the business quite a than support it. A major cause is that the fiber of the data models implemented in! systems and interfaces is poor] * Business rules, peculiar(prenominal) to how things are done in a particular place, are often fixed in the structure of a data model. This kernel that small changes in the way business is conducted shoot to epic changes in computer systems and interfaces. * Entity types are often not identified, or incorrectly identified. This can lead to replication of data, data structure, and functionality, unitedly with the attendant...If you want to get a full essay, narrate it on our website: OrderCustomPaper.com

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