ACCURACY OF THEMATIC MAPS / IMPLICATIONS OF CHOROPLETH SYMBOLIZATION
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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 study presented is on data representation accuracy considering the specific case of choropleth maps. It is demonstrated that three factors, enumeration unit size, enumeration unit compactness, and variability of the distributions mapped are significant in determining enumeration unit aggregate value accuracy and, therefore, map accuracy. Based on experimental results, it is suggested that potential accuracy of choropleth maps could be predicted through measurement of these characteristics. A second experiment is used to demonstrate the applicability of this method to predicting overall choropleth map accuracy as well as the geographic distribution of any error present in the map.Keywords:
Thematic map
Representation
Enumeration
The book outlines the scientific achievements of digital cartography developed for the purpose of the National Atlas of Slovenia, published in 1998 with the title Geographical Atlas of Slovenia. Different topics, referring to thematic maps, such as brief description of the history of thematic cartography and various atlases, have been explained. Further on all stages in the working process of digital mapmaking with all the emphasis on appropriate aesthetic solutions in accordance with different content use have been interpreted in detail. Cartographic scientific statements have been emphasised with cases of thematic maps from the Geographical Atlas of Slovenia. The author demonstrates the classical cartographic principles, formed in long lasting development of cartographic profession as well as the newest methodological ascertainments that were applied using the up-to-date digital technology.
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Digital mapping
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Thematic map
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This comprehensive and well-established cartography textbook covers the theory and the practical applications of map design and the appropriate use of map elements. It explains the basic methods for visualizing and analyzing spatial data and introduces the latest cutting-edge data visualization techniques. The fourth edition responds to the extensive developments in cartography and GIS in the last decade, including the continued evolution of the Internet and Web 2.0; the need to analyze and visualize large data sets (commonly referred to as Big Data); the changes in computer hardware (e.g., the evolution of hardware for virtual environments and augmented reality); and novel applications of technology. Key Features of the Fourth Edition: Includes more than 400 color illustrations and it is available in both print and eBook formats. A new chapter on Geovisual Analytics and individual chapters have now been dedicated to Map Elements, Typography, Proportional Symbol Mapping, Dot Mapping, Cartograms, and Flow Mapping. Extensive revisions have been made to the chapters on Principles of Color, Dasymetric Mapping, Visualizing Terrain, Map Animation, Visualizing Uncertainty, and Virtual Environments/Augmented Reality. All chapters include Learning Objectives and Study Questions. Provides more than 250 web links to online content, over 730 references to scholarly materials, and additional 540 references available for Further Reading. There is ample material for either a one or two-semester course in thematic cartography and geovisualization. This textbook provides undergraduate and graduate students in geoscience, geography, and environmental sciences with the most valuable up-to-date learning resource available in the cartographic field. It is a great resource for professionals and experts using GIS and Cartography and for organizations and policy makers involved in mapping projects.
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Thematic map
Geovisualization
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ABSTRACT Total map perception integrates geographic material (the base map) and thematic material (the distribution which is mapped). Psychological studies of the figure-ground relationship indicate that maps should be designed so that thematic symbols are experienced as figures, and base map materials as ground. Figure perception is enhanced by heterogeneity, contour, and area or enclosedness; the cartographic designer has greatest control over heterogeneity. Tests of preprinted area patterns for heterogeneity indicate that the perception of figures against ground is most enhanced, other things being equal, by patterns which have coarser texture and a higher percentage of area inked.
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Figure–ground
Texture (cosmology)
Contour line
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Firstly the importance of rapid cartography of thematic chart has been discussed.The study on relative technology is brought out.In this paper,The matic database and platform frame construction of basic geography oriented rapid cartography is discussed which provide technical reference for the lash-up guarantee of thematic chart henceforth.
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Introduction – the Purpose of the Map Design Considerations Visual Variables and Colour Thematic Maps of Areal Data Thematic Maps of Point Data Getting Away From Paper: The Digital Age Summary
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1. Introduction. I. PRINCIPLES OF CARTOGRAPHY. 2. History of Thematic Cartography. 3. Statistical and Graphical Foundation. 4. Principles of Symbolization. 5. Data Classification. 6. Scale and Cartographic Generalization. 7. The Earth and its Coordinate System. 8. Elements of Map Projections. 9. Selecting an Appropriate Projection. 10. Principles of Color. 11. Elements of Map Design. 12. Map Production and Dissemination. II. MAPPING TECHNIQUES. 13. Choropleth Mapping. 14. Isarithmic Mapping. 15. Symbolizing Topography. 16. Proportional Symbol Mapping. 17. Dot and Dasymetric Mapping. 18. Bivariate and Multivariate Mapping. 19. Additional Techniques. III. GEOGRAPHIC VISUALIZAION. 20. Animation. 21. Data Exploration. 22. Electronic Atlases and Miltimedia. 23. Visualizing Data Quality. 24. Virtual and Mixed Environments. 25. Ongoing Developments.
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In this soundly constructed, well referenced, and beautifully illustrated book, Professor Robinson has demonstrated a growing sense of scholarly purpose within the history of cartography.--J. B. Harley, Times Higher Educational Supplement
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