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Relief visualization techniques using free and open source GIS tools

shaded relief representation by clustering aspect. “The Cartographical Journal” Vol. 51, no. 4, pp. 291−300. Veronesi F., Hurni L., 2015, A GIS tool to increase the visual quality of relief shading by automatically changing the light direction. “Computers and Geosciences” Vol. 74, pp. 121−127. Viljoen D., Harris J., 2006, Saturation and value modulation (SVM): A new method for integrating color and grey-scale imagery. “Digital Mapping Techniques ‘06 − Workshop Proceedings, 11−14 June 2006”. Columbus, Ohio. U.S. Geological Survey Open-File Report 2007

Open access
An evaluation of GIS tools for generating area cartograms

Abstract

The purpose of this article is to report a study aimed at systematic assessment of the functionality of commercially available software for the automatic generation of area cartograms. The issue of the wide choice of algorithms developed over the years for generating various types of surfaces has also been raised.

Cartograms (called also anamorphic maps) are constructed by changing the surface area of each spatial unit in step with the corresponding value of the mapped thematic variable (area cartogram) or changing accordingly the distance between the preselected focal point and other points on the map (distance cartogram). Depending on the shape of mapping units, the following three types of area cartograms can be distinguished:

  • proportional symbol cartograms were the original shapes of mapping units have been replaced with simple geometric shapes such as squares, rectangles or circles (for example, Dorling Circle Cartograms, square cartogram);
  • continuous regular cartograms where the shapes of areal units on the map resemble the actual shapes of the mapped units but their boundaries have been geometrized to consist of perpendicular sections;
  • continuous irregular cartograms where the shapes of areal units on the map resemble the actual shapes of the mapped units but unit boundaries are not straight lines.

Cartograms can also be constructed to preserve spatial contiguity (continuous cartograms) or not (noncontinuous cartograms), with the latter often preserving the underlying neighborhood relationships to some degree.

While constructing area cartogram, one needs to decide first the type of a surface to be developed, and therefore, the algorithm to be applied. The next step in map construction is the choice of software, where tool selection depends often on the predetermined type of the cartogram.

The study surveyed five programs for the construction of area cartograms – all available free of charge. Each of those software tools was used to generate area cartograms portraying data from the 2010 presidential election in Poland.

Two groups of area cartograms where generated for the purpose of this study: maps of the entire Poland by voivodships, showing the number of valid votes cast for the two presidential candidates in each voivodship, and maps of the Mazowieckie voivodship by county, portraying the number of valid votes cast for the individual candidates in each county.

The subsequent in-depth assessment of surveyed programs took into account eleven criteria including the number of cartogram types that might be developed using each program, availability of tools for the proper legend construction and display, possibility of supplementing the cartogram with complementary choropleth maps, the option for inserting map labels, the type of spatial data that can be used in the software (reference to points, lines, polygons) and so on.

The study has demonstrated that the tool included in the ArcGIS (Cartogram Utility for ArcGIS) best met the survey criteria scoring 9 points. The application Scape Toad placed second (7.5 pts.), while MapViewer 7 came third (6.25 pts.).

When generating cartograms in the available GIS programs, one should also pay attention to the visual qualities of the generated maps, and in particular, to the resemblance of shapes of spatial units on the map to the their actual geographic boundaries. Since the shape outlines obtained on the map vary depending on the underlying geodetic reference system, the best coordinate system for the mapped area should be selected. However, if such system cannot be used within a given cartogram generating tool, then the obtained cartogram should be exported and refined with some general software package for graphic editing.

Open access
The comparative analysis of selected interactive data presentation techniques on the example of the land use structure in the commune of Tomice

Literature Afzal W., Torkar R., Feldt R., 2009, A systematic review of search-based testing for non-functional system properties . “Inf. Software Technology” Vol. 51, no. 6, pp. 957–976. Bennett R., O’Neill E.T., Kammerer K., 2014, assign-FAST: An autosuggest-based tool for FAST subject assignment . “Information Technology and Libraries” Vol. 33, no. 1, pp. 34–43. Blackstock M., Lea R., 2012, IoT mashups with the WoTKit . In: 3rd International Conference on the Internet of Things (IOT) , IEEE, pp. 159–166. Bostock M., Ogievetsky V

Open access
The cartographic methods of presentation and GIS tool in analysis of historical data on the example of Great War cemeteries in southern Poland

Abstract

The paper deals with the application of Geographic Information System software in cartographic data presentation in the field of historical data mining. Lists of soldiers buried in the I world war cemeteries near Jasło were used. The prepared database helped to create series of maps, mainly diagram maps, that serve as a useful statistical and demographic characteristics of the phenomena. The authors stressed advantages of the solution used and the usefulness of historical data in spatial database preparation process. The shortages of the GIS software itself were also pointed out, especially as long as cartographic editing and methodology principles are concerned.

Open access
Measures and visualization methods of map projection distortions with the use of “python matplotlib library” as an example

.uni-stuttgart.de/gi/geoengine/mappro/ www.mathworks.com/help/map/visualizing-and-quantifying-projection-distortions.html pl.wikipedia.org/wiki/Uk%C5%82ad_GUGIK_1980#/media/File:Gugik80_znieksztalcenia.png www.progonos.com/furuti/MapProj/Dither/CartProp/DefPatA/defPatA.html www.oshermaps.org/of-maps-and-history/great-interactive-tool-to-teach-the-distortions-of-the-mercator-projection

Open access
Perception of the contents of animated maps

, Heerlen, Netherlands. <https://www.ou.nl/Docs/Expertise/OTEC/Nieuws/icleps%20conferentie/Ayres.doc> (access 12.1.2017). Cornwall B., Robinson A., 1966, Possibilities for computer animated films in cartography. “The Cartographic Journal” Vol. 3, No. 2, pp. 79-82. Dransch D., 1993, Kartographische Animation. In: Kartographie und Geo-Informationssysteme, Grundlagen, Entwicklungsstand und Trends. „Kartographische Schriften” 1. Bonn: Kirschbaum Verlag, pp. 3-15. Gersmehl P.J., 1990, Choosing tools: nine metaphors of four

Open access
Non-State Actors in Cyberspace Operations

References [1] Amorosi, D., “Chinese State of Denial,” Infosecurity, Vol 8 Issue 6, Elsevier, Nov.-Dec. 2011. [2] Andress, J. and Winterfeld, S., “Cyber Warfare: Techniques, Tactics and Tools for Security Practitioners,” Elsevier, 2011, p. 199. [3] Applegate, S. D., “Cybermilitias and Political Hackers: Use of Irregular Forces in cyberwarfare,” IEEE Security & Privacy, Volume 9, Issue 5, Sep.-Oct. 2011. [4] Arquilla, J. and Ronfeldt D. F., “Networks and Netwars: The Future of Terror, Crime, and

Open access
Methodology for mapping the average transaction prices of residential premises using GIS

Abstract

Geographic information systems (GIS) and their tools support the process of real estate trading. Of key importance is the ability to visualise information about real estate in the form of maps of average real estate transaction prices. The following study presents a methodology for mapping average real estate transaction prices using GIS. The map development process comprised three main stages. In the first stage, the input data was processed and statistically analysed. Official data came from the Register of Real Estate Prices and Values, and open data from the National Register of Boundaries. The second stage involved the visualization of the data in the form of maps of average apartment prices using the cartographic methods of choropleth maps and diagrams. The commercial tool ArcMap 10.3 and the free Quantum GIS software were used in the design of the maps of average real estate transaction prices, to check the options for using these types of programs. As a result, eight maps were designed presenting the average transaction prices for residential properties in the Warsaw district of Ursynów in 2015. The final stage was the analysis of the designed maps. The influence of the selection of the reference units on the visualization content, and the impact of combining cartographic presentation methods on the complexity of the presentation of real estate information, were also analysed.

Open access
Spatial data processing for the purpose of video games

Abstract

Advanced terrain models are currently commonly used in many video/computers games. Professional GIS technologies, existing spatial datasets and cartographic methodology are more widely used in their development. This allows for achieving a realistic model of the world. On the other hand, the so-called game engines have very high capability of spatial data visualization. Preparing terrain models for the purpose of video games requires knowledge and experience of GIS specialists and cartographers, although it is also accessible for non-professionals. The authors point out commonness and variety of use of terrain models in video games and the existence of a series of ready, advanced tools and procedures of terrain model creating. Finally the authors describe the experiment of performing the process of data modeling for “Condor Soar Simulator”.

Open access