Evolving information systems: meeting the ever-changing environment

To meet the demands of organizations and their ever-changing environment, information systems are required which are able to evolve to the same extent as organizations do. Such a system has to support changes in all time-and application-dependent aspects. In this paper, requirements and a conceptual framework for evolving information systems are presented. This framework includes an architecture for such systems and a revision of the traditional notion of update. Based on this evolutionary notion of update (recording, correction and forgetting) a state transition-oriented model on three levels of abstraction (event level, recording level, correction level) is introduced. Examples are provided to illustrate the conceptual framework for evolving information systems

Zoom Down and Fly Around a Landsat 7 Dataset of Chile

Zoom down and fly around Chile. Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional

MODIS View of Typhoon Yutu

The MODIS instrument on Terra captured Typhoon Yutu, in the South China Sea. Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional

Slow zoom down to Belize then pan to Misteriosa Bank then back to Belize

Zooming down to Belize then across to the Misteriosa Bank. Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional

Spinning Global Shortwave from CERES

CERES stands for Clouds and the Earths Radiant Energy System. More information about CERES can be found at (http:--terra.nasa.gov-Brochure-Sect_4-3.html) and (http:--asd-www.larc.nasa.gov-ceres-brochure-intro.html). Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional

Hurricane Erin from SeaWiFS: September 10, 2001 (Version 2)

Hurricane Erin off the eastern coast of America Educational levels: Undergraduate lower division, Undergraduate upper division, Graduate or professional