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Computing Stable Demers Cartograms [article]

Soeren Nickel, Max Sondag, Wouter Meulemans, Markus Chimani, Stephen Kobourov, Jaakko Peltonen, Martin Nöllenburg
2019 arXiv   pre-print
We present a method to compute stable Demers cartograms, where each region is shown as a square and similar data yield similar cartograms.  ...  Cartograms are popular for visualizing numerical data for map regions. Maintaining correct adjacencies is a primary quality criterion for cartograms.  ...  Discussion and future work We described a linear program to compute stable Demers cartograms, based on separation constraints and minimizing distance between adjacent regions.  ... 
arXiv:1908.07291v2 fatcat:cxhsbjibnferpncxblyq5v4pqi

Multicriteria Optimization for Dynamic Demers Cartograms

Soeren Nickel, Max Sondag, Wouter Meulemans, Stephen G. Kobourov, Jaakko Peltonen, Martin Nollenburg
2022 IEEE Transactions on Visualization and Computer Graphics  
We present a method to compute stable stable Demers cartograms, where each region is shown as a square scaled proportionally to the given numerical data and similar data yield similar cartograms.  ...  cartograms is another important criterion alongside traditional cartogram criteria such as maintaining adjacencies.  ...  CONCLUSIONS AND FUTURE WORK We described a linear program to compute stable Demers cartograms for dynamic data based on separation constraints and minimizing distance between adjacent regions.  ... 
doi:10.1109/tvcg.2022.3151227 pmid:35157586 fatcat:vg75ekx22vdllawfhy4gff563a

Visualizing and Analysing Public-Health Data Using Value-by-Area Cartograms: Toward a New Synthetic Framework

Daniel Z Sui, James B Holt
2008 Cartographica  
The effects of using cartograms in spatial statistical analysis were evaluated by comparing analytical results derived from cartograms with those based on choropleth maps.  ...  Our results indicate that a comprehensive understanding of cartograms must include cognitive, analytical, and critical dimensions.  ...  In addition, cartograms are often classified as contiguous, non-contiguous, Dorling-like, or pseudo cartograms (for details see Bortins and Demers 2002 ).  ... 
doi:10.3138/carto.43.1.3 fatcat:oqlo2qzbz5bbtjctehublnx3c4

Visualizing and Analysing Public-Health Data Using Value-by-Area Cartograms: Toward a New Synthetic Framework

Daniel Z Sui, James B Holt
2008 Cartographica  
The effects of using cartograms in spatial statistical analysis were evaluated by comparing analytical results derived from cartograms with those based on choropleth maps.  ...  Our results indicate that a comprehensive understanding of cartograms must include cognitive, analytical, and critical dimensions.  ...  In addition, cartograms are often classified as contiguous, non-contiguous, Dorling-like, or pseudo cartograms (for details see Bortins and Demers 2002 ).  ... 
doi:10.3138/carto.43.1.003 fatcat:ezgcw45bbjcgvcqcu6hf42lrtu

Obesity in Canada: where and how many?

A Vanasse, M Demers, A Hemiari, J Courteau
2005 International Journal of Obesity  
All these measures were based on the respondent's selfreported answers to a computer-assisted personal or telephone interview.  ...  Cartograms were used in addition to traditional mapping to take into account the differences in population density between these small areas.  ...  Acknowledgements We are indebted to Michael T Gastner and Mark Newman for their valuable help by generously sharing their algorithm for producing cartograms.  ... 
doi:10.1038/sj.ijo.0803168 pmid:16276358 fatcat:oxgje4cqj5gvtkinu2pehorrxu

Generating stable demers Cartograms and Iso-Hexagon cartograms

Soeren Nickel, Martin Nöllenburg
2019
In this thesis we approach the topic of automated generation of stable Demers cartograms and iso-hexagon cartograms.  ...  For this, we present an LP formulation which can be used to create stable sets of Demers cartograms and iso-hexagon cartograms.  ...  To counteract this we can employ an iterative approach to creating stable cartograms.  ... 
doi:10.34726/hss.2019.68421 fatcat:ekeuvzft7ja6rlgyiwbieit3we

Comparison of ArcGIS and QGIS for applications in sustainable spatial planning

Corinna Friedrich
2014 unpublished
While ArcGIS computes a mean global radiation of 5721 Wh/m², QGIS computes 3974 Wh/m² which represents a 30.5% difference.  ...  Despite the required adoptions of the settings and data quality the features ran stable and no runtime errors occurred.  ... 
doi:10.25365/thesis.35758 fatcat:ivsiqp6cgfhb3o343zvzziixii

1810-1820 Copy editing: Sara King (English)

Steffen Nijhuis, Steffen Nijhuis
unpublished
applications: image processing (raster-based), computer-aided design (CAD) (vector-based), mapping or map-making, and database management. 160 According to Maguire et al. (1991) , DeMers (2009), Chang  ...  DeMers, 2009, pp. 313-332. 181 Cowen Chrisman, 2002; Harvey, 2008; DeMers, 2009 . 182 Schuurman, 2004 Boolean algebra is a subarea of algebra in which the values of the variables are the truth values  ... 
fatcat:3ysrtj4oybcppo2zceuvajbekq

Journal of Urban and Regional Analysis Wilfried HELLER-Identities and Conceptions of Border Area Population in East-Central and South-East Europe-Thematic Aspects and Questions of an Actual Research Field Margarita ILIEVA-Territorial Differences in Transformation Processes in Bulgaria

Hans-Joachim Bűrkner, Joan Bernat, Milan Bufon, Darrick Danta, Joaquin Dasi, Hermanus Geyer, Lisa Harrington, Jean-Baptiste Humeau, Sebastian Kinder, Lydia Mihelic, Mark Rosenberg, Petr Rumpel (+12 others)
2011 unpublished
At the very least, the situation has become stable and jobs are no longer being lost. Monthly figures for employment contracts confirm a similar pattern.  ...  The differences between North and South Bulgaria are outlined by Stoyanov, Dimov (2006) , who claim that "a stable south-to-north dichotomy in GDP is arising.  ...  Besides, the rich graphic -more than 100 maps, cartograms and photographic images -is one of the characteristics which increases the attractiveness of this book, emphasizing an essential aspect followed  ... 
fatcat:l7gtvbqin5ci7ata7rgz5q43zy