Web cartography: dissemination of spatial data on the web

However definite our maps and databases might look, in most cases the information they contain is passed its “sell-by date”. There are several reasons for this. Among them are the technical and financial constraints on the data collection process, that make constant updating, although possible, either impractical or undesirable. Another reason is the output medium used. Although the traditional printed maps offer superior quality and are usually the most practical to use, the production time involved invariably results in a built-in “out-ofdateness”. Map users in this age of information no longer readily accept “stale” information
and therefore cartographers are looking for new ways to get mapped information to their users. At the same time, cartography itself is changing: changing from being supply-driven to demand-driven. More people will be involved in making maps.