Fast map interface with large number of vector objects
Name
Dmitri TimaĊĦjov
Abstract
The main purpose of the current paper was to study which features could provide benefits for fast representation and generalization of large volumes of spatial data. Work concentrates on vector data type and provides the overview of the most common technologies used to speed-up the process of rendering objects on the map. The main emphasis was on the practical implementation of several optimization methods, namely, clustering, canvas renderer, and decimation principle. Map readability and geovisualization usability issues were also discussed.
Prototype created as a practical part of the thesis was used as the input for measuring the effectiveness of a particular technology, where the time needed to render vector objects as well as map readability were considered as main criteria. The results were computed for various cases, using different number of objects. The data obtained during the experiment indicate that none of the examined approaches allows to solve alone the performance problem - each optimization method has its advantages and disadvantages.
If the goal of the GIS web application is to provide an efficient vector web mapping in satisfying time and allow manipulation with the data, then several optimization and rendering approaches should be used together.
Graduation Thesis language
English
Graduation Thesis type
Bachelor - Computer Science
Supervisor(s)
Vambola Leping, Toivo Vajakas
Defence year
2013