Showing papers on "Data aggregator published in 1999"

Display of visual data utilizing data aggregation

Abstract: A method for visualizing time-varying data from one or more data streams at a different interval than the interval between acquisition of the individual data items in the data stream. Data received is combined, or aggregated, between updates of a display to retain some information from each element. The aggregated data is then displayed at the next update of the display in a number of display elements. The characteristics of the display elements, and the organization of the elements represent changes in the data streams.

Presenting Geographic Information: Effects of Data Aggregation, Dispersion, and Users' Spatial Orientation

Abstract: Geographic information systems (GIS) have taken on an increasingly important role supporting decision making in many organizations. GIS have been used to support a breadth of tasks including oil and mineral exploration, facility location, logistics support, and facilities management decisions. The effectiveness of GIS as a decision support tool comes primarily from the visual display of data in the form of maps. When presenting information as a geographic map, the level of data aggregation potentially affects aspects of task complexity such as information load and the potential for pattern recognition by the user. Other task attributes expected to be related to data aggregation effects include problem size, the degree of data dispersion, and users' spatial orientation skills. We conducted an experiment to study these effects and their interactions. Subjects used a GIS including map-based information characterized by different levels of problem size, data dispersion, and data aggregation. Spatial orientation skill was examined as a covariate in the experimental treatments. The results indicate that all of these geographic information characteristics have significant impacts on decision performance. Moreover, many interactions are present among the factors. We evaluate these interactions in order to derive implications for practice and for future research.