Document Type : Research Paper

Author

• Mahdi Modiri

Associate Professor of Urban planning, Malek-Ashtar University of Technolog

Abstract

The basis of decision-making and selection of Geographic Information Systems (GIS) is the quality of geographic information. Many executive centers of geographic information systems and their users usually seek application and utilization of more powerful computers with various abilities such as high volume of memory, power of processing and graphic display (size, color and form of display) as well as a variety of programs capable of analysis and modeling, and concern less about the quality of information. It is so while today many of GIS managers’ expectations have not yet been fulfilled and many promises have failed despite vast investments in provision of hardware systems and collection, provision and storage of geographic data.
Quality of information is one of the most important issues that has received less attention. Quality of information is in direct connection with precision, clarity, scientific bases of combination of information, analysis and modeling.
In general, effective and determining factors can be categorized into four branches: geographic information database; structure of information; storage, search for data, distribution and propagation of information; and cartographic process of information and its necessary considerations.