mahmud mohebbi

The database management system (DBMS) is comprised of a set of related data, and a set of computer programs for access to those data. A data set is usually called a database, and a set of programs is usually called database management. Due to the importance of information in all plans at all levels the database is considered a valuable source. Consequently, its concepts and principles need to be developed. The purpose of this article is to present the overall features of the database system. In addition, the features and capabilities of the database system are expressed.

The advantage of repetitive Wifs data with poor spatial resolution is to estimate products. The analysis of Wifs data at different times indicates the phenological changes that cause the product to be isolated and can be used to identify the products and changes due to different stages of growth.The results of the Wifs data at different times show that different products are separated according to temporal and spectral characteristics. However, they show similar shapes like forest, city and deep water with their little or no changes. These shapes can be used to normalize atmospheric effects on temporal data needed for spectral profiles.