Efficient map visualization on the Web

Marcelo GattassCarla Cristina F. FerreiraAlexandre S. VilarMark S. Glasberg

The use of Geographic Information Systems in the web requires the transmission of maps as figures. These figures can only be encoded as raster images if a very low resolution is used, otherwise they produce very large files. An important feature of these figures is that they usually have polygonal lines with a great number of points. General­purpose vector formats generate files which are also too large to be transmitted through the web. TWF is an active and scalable vector file format that is capable of storing these map figures in small files. This paper presents a set of software components that constitute a simple framework to support map visualization over the web based on this format. Examples are shown to evaluate the proposed strategies and conclusions are drawn based on these examples.

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