Download Cartography: Visualization of Geospatial Data, 3rd Edition by Menno-Jan Kraak, Ferjan Ormeling PDF

By Menno-Jan Kraak, Ferjan Ormeling

This revised and up-to-date variation integrates the most recent in sleek know-how with conventional cartographic rules. whereas supplying a great conceptual origin in cartographic method, the textual content additionally introduces the very most up-to-date advances that experience significantly prompted cartographic thoughts. the recent version displays the expanding significance of cartography because the foundation for additional geographical examine, the textual content has been up to date all through and chapters at the newest advancements in cartography were built-in. there's additionally a extra common emphasis on multimedia and the internet.

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Extra resources for Cartography: Visualization of Geospatial Data, 3rd Edition

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To an environmentalist and a traffic manager a road seems to be the same object. However, the two viewpoints may differ considerably. An environmentalist will look at the road as a barrier to wildlife migration patterns. From this perspective he or she wants to know its width, how busy it is, the width of the verge, whether there are any crash barriers, and the level of noise pollution, etc. A traffic manager will look at the road from a safety and transport perspective. Questions he or she will have are related to the capacity of the road, the number of accidents, traffic lights, flyovers, etc.

01 mm2 are represented independently. See Plate 4. Equally important as the geometrical resolution is the radiometric one. It refers to the number of colours that can be differentiated between by the scanner and to its display capabilities as well. In contrast to vector files, transforming raster files to other projections is very difficult. Coordinate systems with which the images are overlaid cannot easily be changed for other systems. Additionally, the pixel is the basic unit of the image structure and it might not be relevant as a reference unit for the theme mapped.

Checking its consistency can only be done visually. This approach was introduced at the beginning of the 1970s. More advanced are those vector data structures that contain topology. Topology defines the mutual relations between geospatial objects and can be used to check consistency among point, line and area objects, or help in finding answers to more complex queries. Topology can also be described as the highest level of generalization possible. 12(b). 12(b) I has its ‘natural’ boundaries. In II and III these boundaries have been strongly generalized, but relations between area C and its neighbours are still valid.

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