
M. Sester, J. Jokar~Arsanjani, R. Klammer, D. Burghardt, and J.H. Haunert. Integrating and generalising volunteered geographic information. In D. Burghardt, C. Duchene, and W. Mackaness, editors, Lecture Notes in Geoinformation and Cartography. Abstracting Geographic Information in a Data Rich World. SpringerVerlag, Berlin, Germany, 2014.
abstract
doi
bibtex

 The availability of spatial data on the web has greatly increased through the availability of usergenerated community data and geosensor networks. The integration of such multisource data is providing promising opportunities, as integrated information is richer than can be found in only one data source, but also poses new challenges due to the heterogeneity of the data, the differences in quality and in respect of tagbased semantic modelling. The chapter describes approaches for the integration of official and informal sources, and discusses the impact of integrating usergenerated data on automated generalisation and visualisation. @inproceedings{SesterEtAl2014,
abstract = {The availability of spatial data on the web has greatly increased through the availability of usergenerated community data and geosensor networks. The integration of such multisource data is providing promising opportunities, as integrated information is richer than can be found in only one data source, but also poses new challenges due to the heterogeneity of the data, the differences in quality and in respect of tagbased semantic modelling. The chapter describes approaches for the integration of official and informal sources, and discusses the impact of integrating usergenerated data on automated generalisation and visualisation.},
author = {M. Sester and J. {Jokar~Arsanjani} and R. Klammer and D. Burghardt and J.H. Haunert},
booktitle = {Abstracting Geographic Information in a Data Rich World},
doi = {10.1007/9783319002033_5},
editor = {Burghardt, D. and Duchene, C. and Mackaness, W.},
publisher = {SpringerVerlag, Berlin, Germany},
series = {Lecture Notes in Geoinformation and Cartography},
title = {Integrating and Generalising Volunteered Geographic Information},
year = {2014}
}


T. C. van Dijk, and J.H. Haunert. Interactive focus maps using leastsquares optimization. International Journal of Geographical Information Science, 28(10), 2014.
abstract
doi
bibtex

 We present a new algorithm that enlarges a focus region in a given network map without removing nonfocus (i.e., context) network parts from the map or changing the map's size. In cartography, this problem is usually tackled with fisheye projections, which, however, introduce severe distortion. Our new algorithm minimizes distortion and, with respect to this objective, produces results of similar quality compared to an existing algorithm. In contrast to the existing algorithm, the new algorithm achieves realtime performance that allows its application in interactive systems. We target applications where a user sets a focus by brushing parts of the network or the focus region is defined as the neighborhood of a moving user. A crucial feature of the algorithm is its capability of avoiding unwanted edge crossings. Basically, we first solve a leastsquares optimization problem without constraints for avoiding edge crossings. The solution we find is then used to identify a small set of constraints needed for a crossingfree solution and, beyond this, allows us to start an animation enlarging the focus region before the final, crossingfree solution is found. Moreover, memorizing the noncrossing constraints from an initial run of the algorithm allows us to achieve a better runtime on any further run  assuming that the focus region does not move too much between two consecutive runs. As we show with experiments on realworld data, this enables response times well below 1 second. @article{VanDijkHaunert,
abstract = {We present a new algorithm that enlarges a focus region in a given network map without removing nonfocus (i.e., context) network parts from the map or changing the map's size. In cartography, this problem is usually tackled with fisheye projections, which, however, introduce severe distortion. Our new algorithm minimizes distortion and, with respect to this objective, produces results of similar quality compared to an existing algorithm. In contrast to the existing algorithm, the new algorithm achieves realtime performance that allows its application in interactive systems. We target applications where a user sets a focus by brushing parts of the network or the focus region is defined as the neighborhood of a moving user. A crucial feature of the algorithm is its capability of avoiding unwanted edge crossings. Basically, we first solve a leastsquares optimization problem without constraints for avoiding edge crossings. The solution we find is then used to identify a small set of constraints needed for a crossingfree solution and, beyond this, allows us to start an animation enlarging the focus region before the final, crossingfree solution is found. Moreover, memorizing the noncrossing constraints from an initial run of the algorithm allows us to achieve a better runtime on any further run  assuming that the focus region does not move too much between two consecutive runs. As we show with experiments on realworld data, this enables response times well below 1 second.},
author = {T. C. van Dijk and J.H. Haunert},
doi = {10.1080/13658816.2014.887718},
journal = {International Journal of Geographical Information Science},
number = {10},
title = {Interactive Focus Maps Using LeastSquares Optimization},
volume = {28},
year = {2014}
}


A. Gemsa, B. Niedermann, and M. Nöllenburg. Label placement in road maps. In Proceedings of the 30th European Workshop on Computational Geometry (EuroCG'14). 2014. Preprint.
bibtex

 @inproceedings{gnnlprm14,
author = {A. Gemsa and B. Niedermann and M. N{\"o}llenburg},
booktitle = {Proceedings of the 30th European Workshop on Computational Geometry (EuroCG'14)},
file = {gnnlprm14.pdf:http\://i11www.ira.uka.de/extra/publications/gnnlprm14.pdf:PDF},
month = {March},
note = {Preprint.},
title = {{Label Placement in Road Maps}},
year = {2014}
}


T. Bläsius, F. Klute, B. Niedermann, and M. Nöllenburg. Pigra  a tool for pixelated graph representations. In Christian A. Duncan, and Antonios Symvonis, editors, volume 8871 of Lecture Notes in Computer Science. Proceedings of the 22nd International Symposium on Graph Drawing (GD'14), pages 513514. Springer, 2014. Poster abstract.
bibtex

 @inproceedings{bknnpigra14,
author = {T. Bl{\"a}sius and F. Klute and B. Niedermann and M. N{\"o}llenburg},
booktitle = {Proceedings of the 22nd International Symposium on Graph Drawing (GD'14)},
editor = {Christian A. Duncan and Antonios Symvonis},
file = {bknnpigra14.pdf:http\://i11www.ira.uka.de/extra/publications/bknnpigra14.pdf:PDF},
note = {Poster abstract.},
pages = {513514},
publisher = {Springer},
series = {Lecture Notes in Computer Science},
title = {{PIGRA  A Tool for Pixelated Graph Representations}},
volume = {8871},
year = {2014}
}


T. C. van Dijk, A. van Goethem, J.H. Haunert, W. Meulemans, and B. Speckmann. An automated method for circulararc metro maps. In Abstracts of the Schematic Mapping Workshop 2014. 2014.
bibtex

 @inproceedings{vanDijkEtAl2014,
author = {T. C. van Dijk and A. van Goethem and J.H. Haunert and W. Meulemans and B. Speckmann},
booktitle = {Abstracts of the Schematic Mapping Workshop 2014},
title = {An Automated Method for CircularArc Metro Maps},
url = {https://sites.google.com/site/schematicmapping/DijkCircular.pdf},
year = {2014}
}


M. Chimani, T. C. van Dijk, and J.H. Haunert. How to eat a graph: computing selection sequences for the continuous generalization of road networks. In Proc. 22nd ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM SIGSPATIAL GIS '14), pages 243252. 2014.
doi
bibtex

 @inproceedings{ChimaniEtAl2014,
author = {M. Chimani and T. C. van Dijk and J.H. Haunert},
booktitle = {Proc. 22nd ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM SIGSPATIAL GIS '14)},
doi = {10.1145/2666310.2666414},
pages = {243252},
title = {How to Eat a Graph: Computing Selection Sequences for the Continuous Generalization of Road Networks},
year = {2014}
}


T. C. van Dijk, A. van Goethem, J.H. Haunert, W. Meulemans, and B. Speckmann. Map schematization with circular arcs. In volume 8728 of Lecture Notes in Computer Science. Proc. 8th International Conference on Geographic Information Science (GIScience'14), pages 117. SpringerVerlag, Berlin, Germany, 2014.
doi
bibtex

 @inproceedings{DijkEtAl2014,
author = {T. C. van Dijk and A. van Goethem and J.H. Haunert and W. Meulemans and B. Speckmann},
booktitle = {Proc. 8th International Conference on Geographic Information Science (GIScience'14)},
doi = {10.1007/9783319115931_1},
pages = {117},
publisher = {SpringerVerlag, Berlin, Germany},
series = {Lecture Notes in Computer Science},
title = {Map Schematization with Circular Arcs},
volume = {8728},
year = {2014}
}


J.H. Haunert, and T. Hermes. Labeling circular focus regions based on a tractable case of maximum weight independent set of rectangles. In Proc. 2nd ACM SIGSPATIAL Workshop on MapInteraction. 2014.
doi
bibtex

 @inproceedings{HaunertHermes2014,
author = {J.H. Haunert and T. Hermes},
booktitle = {Proc. 2nd ACM SIGSPATIAL Workshop on MapInteraction},
doi = {10.1145/2677068.2677069},
numpages = {7},
title = {Labeling Circular Focus Regions Based on a Tractable Case of Maximum Weight Independent Set of Rectangles},
year = {2014}
}


N. Schwartges, J.H. Haunert, D. Zwiebler, and A. Wolff. Point labeling with sliding labels in interactive maps. In Lecture Notes in Geoinformation and Cartography. Proc. 17th AGILE International Conference on Geographic Information Science, pages 295310. SpringerVerlag, Berlin, Germany, 2014.
doi
bibtex

 @inproceedings{SchwartgesEtAl2014,
author = {N. Schwartges and J.H. Haunert and D. Zwiebler and A. Wolff},
booktitle = {Proc. 17th AGILE International Conference on Geographic Information Science},
doi = {10.1007/9783319036113_17},
pages = {295310},
publisher = {SpringerVerlag, Berlin, Germany},
series = {Lecture Notes in Geoinformation and Cartography},
title = {Point Labeling with Sliding Labels in Interactive Maps},
year = {2014}
}


N. Schwartges, A. Wolff, and J.H. Haunert. Labeling streets in interactive maps using embedded labels. In Proc. 22nd ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM SIGSPATIAL GIS '14), pages 517520. 2014.
doi
bibtex

 @inproceedings{SchwartgesEtAl2014b,
author = {N. Schwartges and A. Wolff and J.H. Haunert},
booktitle = {Proc. 22nd ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (ACM SIGSPATIAL GIS '14)},
doi = {10.1145/2666310.2666494},
pages = {517520},
title = {Labeling Streets in Interactive Maps Using Embedded Labels},
year = {2014}
}
