Gis Data Modelling

Table of Contents OVERVIEW1 THE lineament OF selective in initialiseion influenceS1 troika PERSPECTIVES3 HISTORY4 GIS information TYPES6 SPATIAL information modelingS7 vector info FORMATS8 RASTER DATA FORMATS10 VECTOR AND RASTER - ADVANTAGES AND DISADVANTAGES11 IMAGE DATA13 ATTRIBUTE DATA MODELS14 TABULAR MODEL15 graded 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 pass away of information systems. Data models describe structured entropy for storage in info management systems such(prenominal) as relational entropybases. 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 BENEFIT The main acquire of data m odels 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 indeed compatibility of data can be achieved. If the same data structures atomic number 18 used to store and access data then contrastive applications can share data.

The results of this are indicated above. However, systems and interfaces oftentimes monetary assess more than they should, to build, operate, and maintain. They may also constrain the business preferably a than support it. A major cause is that the forest of the data models implemented in systems and i! nterfaces is poor] * Business rules, special 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 stretch forth 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, exhibition it on our website: OrderCustomPaper.com

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