منابع مشابه
Comparison of thematic maps using symbolic entropy
Comparison of thematic maps is an important task in a number of disciplines. Map comparison has traditionally been conducted using cell-by-cell agreement indicators, such as the Kappa measure. More recently, other methods have been proposed that take into account not only spatially coincident cells in two maps, but also their surroundings or the spatial structure of their differences. The objec...
متن کاملDo Thematic Maps Improve Information Retrieval?
Thematic maps in the context of information retrieval are tools that graphically present documents and characterising terms. We investigated the usefulness of thematic maps in a laboratory experiment comparing a thematic map with a command language interface. Six subjects solved eight search tasks producing ten hours of logged and tape-recorded data. The experiment revealed no improvement in th...
متن کاملHow thematic maps can assist collection management: A qualitative assessment of Journals’ thematic focus
We present a method for mapping the content of a text collection. This method uses linguistic analysis to relate terms extracted from the texts and clusters them into thematic topics mapped onto a 2D space. While the graphic display of domain topics is useful for several information-driven tasks, the focus of the paper is more on the comparison of journal ranking by productivity (number of publ...
متن کاملAutomatic Digitizing of the Colour-Layer of Thematic Maps
A method for automatic classification and dcscription of the colour-layer of thcrnatic maps is presented. Owing to the type of noisc appcaring in the scanncd imagcs, we find it useful to combine pixel classificatiorl and rastcr-to-vector convcrsion in ordcr to produce acceptable results. l'hc colour value of an arca is dctcrmincd from a sclcctivcly sampled set of pixcls and a set of threshold v...
متن کاملAccuracy of Thematic Maps / Implications of Choropleth Symbolization
Accuracy of thematic maps is identified as having two components: planimetric accuracy and data representation accuracy. The first is of only minor concern for thematic maps. Data representation accuracy, however, is at least as significant to map effectiveness as are the perceptual and cognitive aspects of map reading that have been given so much attention in recent years. The focus of the stu...
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ژورنال
عنوان ژورنال: Proceedings of the American Society for Information Science and Technology
سال: 2008
ISSN: 0044-7870
DOI: 10.1002/meet.2008.1450450242