Location based services should communicate information that is relevant to the user and personali... more Location based services should communicate information that is relevant to the user and personalized to his/her interests and needs. Existing LBS exploit ancillary information such as the user’s position, user profile, or time of day to personalize information delivery. However, there are a variety of information sources that remain largely untapped in current LBS. These include data from other applications on the mobile device, Web 2.0 sources, or special sensors. They have the inherent ability to define relevant places, events, activities for the particular user; they also allow to derive spatio-temporal behavior patterns that adapt to context. Using appropriate filters, user-specific information can be mined from these additional ancillary data sources, hence allowing to minimize user interaction, better personalize content, and generate more meaningful real-time map displays. This extended abstract hence proposes the use of different filters to further enable adaptation of mobil...
Die Generalisierung von Karten ist ein Kernprozess in der Kartographie und beschreibt wie raumlic... more Die Generalisierung von Karten ist ein Kernprozess in der Kartographie und beschreibt wie raumliche Phanomene abstrahiert und lesbar auf Karten dargestellt werden. Die Anforderungen an die Generalisierung sind dabei abhangig vom gewahlten Darstellungsmedium und dem Kontext, in dem die Karten angewandt werden. Fur webbasierte und mobile Anwendungen gelten hohe Anforderungen an eine Generalisierung, die in Echtzeit zu erfolgen hat. Fur Nutzerinnen und Nutzer von online und mobilen Anwendungen ist zudem wichtig, dass der Karteninhalt dabei flexibel angepasst werden kann (Modularitat). Durch das Aufkommen neuer Kartentypen, die es erlauben, Inhalte dynamisch aus mehreren Datenquellen zu sogenannten „mash-up“ Karten zusammenzustellen, haben Punktdaten an Wichtigkeit gewonnen. Punktdaten stellen die grundlegendste, aber zugleich auch am starksten abstrahierte Form raumlicher Daten dar. Obwohl Punktdaten zunehmend auf Karten dargestellt werden, sind Losungen zu deren Echtzeitgeneraliserung...
��� In the context of the development of mobile map applications with capabilities for map genera... more ��� In the context of the development of mobile map applications with capabilities for map generalization and abstraction, we propose a methodology for content exploration that uses content zooming as a technique to change the degree of abstraction of map content independently of the map scale. We concentrate on „foreground data‖ (rather than the base map, or map background), and more precisely on POI data and thus on point generalisation. Content zooming provides the user with the capability to change the amount and the granularity of foreground information presented, while keeping the geometric map scale the same. Content zooming allows overriding the effects of ‗standard‘ map generalisation, focusing on optimised content representation to aid the information seeking task of a mobile user. It is thus complementary to map generalisation. Three cases of content zooming operations are distinguished: two cases apply changes to the amount of foreground data presented, while the third c...
European Review of Aging and Physical Activity, 2020
Background Map-based tools have recently found their way into health-related research. They can p... more Background Map-based tools have recently found their way into health-related research. They can potentially be used to quantify older adults’ life-space. This study aimed to evaluate the validity (vs. GPS) and the test-retest reliability of a map-based life-space assessment (MBA). Methods Life-space of one full week was assessed by GPS and by MBA. MBA was repeated after approximately 3 weeks. Distance-related (mean and maximum distance from home) and area-related (convex hull, standard deviational ellipse) life-space indicators were calculated. Intraclass correlations (MBA vs. GPS and test-retest) were calculated in addition to Bland-Altman analyses (MBA vs. GPS). Results Fifty-eight older adults (mean age 74, standard deviation 5.5 years; 39.7% women) participated in the study. Bland-Altman analyses showed the highest agreement between methods for the maximum distance from home. Intraclass correlation coefficients ranged between 0.19 (95% confidence interval 0 to 0.47) for convex h...
ISPRS International Journal of Geo-Information, 2020
Cartographic generalization research has focused almost exclusively in recent years on topographi... more Cartographic generalization research has focused almost exclusively in recent years on topographic mapping, and has thereby gained an incorrect reputation for having to do only with reference or positional data. The generalization research community needs to broaden its scope to include thematic cartography and geovisualization. Generalization is not new to these areas of cartography, and has in fact always been involved in thematic geographic visualization, despite rarely being acknowledged. We illustrate this involvement with several examples of famous, public-audience thematic maps, noting the generalization procedures involved in drawing each, both across their basemap and thematic layers. We also consider, for each map example we note, which generalization operators were crucial to the formation of the map’s thematic message. The many incremental gains made by the cartographic generalization research community while treating reference data can be brought to bear on thematic car...
Location based services should communicate information that is relevant to the user and personali... more Location based services should communicate information that is relevant to the user and personalized to his/her interests and needs. Existing LBS exploit ancillary information such as the user’s position, user profile, or time of day to personalize information delivery. However, there are a variety of information sources that remain largely untapped in current LBS. These include data from other applications on the mobile device, Web 2.0 sources, or special sensors. They have the inherent ability to define relevant places, events, activities for the particular user; they also allow to derive spatio-temporal behavior patterns that adapt to context. Using appropriate filters, user-specific information can be mined from these additional ancillary data sources, hence allowing to minimize user interaction, better personalize content, and generate more meaningful real-time map displays. This extended abstract hence proposes the use of different filters to further enable adaptation of mobil...
Die Generalisierung von Karten ist ein Kernprozess in der Kartographie und beschreibt wie raumlic... more Die Generalisierung von Karten ist ein Kernprozess in der Kartographie und beschreibt wie raumliche Phanomene abstrahiert und lesbar auf Karten dargestellt werden. Die Anforderungen an die Generalisierung sind dabei abhangig vom gewahlten Darstellungsmedium und dem Kontext, in dem die Karten angewandt werden. Fur webbasierte und mobile Anwendungen gelten hohe Anforderungen an eine Generalisierung, die in Echtzeit zu erfolgen hat. Fur Nutzerinnen und Nutzer von online und mobilen Anwendungen ist zudem wichtig, dass der Karteninhalt dabei flexibel angepasst werden kann (Modularitat). Durch das Aufkommen neuer Kartentypen, die es erlauben, Inhalte dynamisch aus mehreren Datenquellen zu sogenannten „mash-up“ Karten zusammenzustellen, haben Punktdaten an Wichtigkeit gewonnen. Punktdaten stellen die grundlegendste, aber zugleich auch am starksten abstrahierte Form raumlicher Daten dar. Obwohl Punktdaten zunehmend auf Karten dargestellt werden, sind Losungen zu deren Echtzeitgeneraliserung...
��� In the context of the development of mobile map applications with capabilities for map genera... more ��� In the context of the development of mobile map applications with capabilities for map generalization and abstraction, we propose a methodology for content exploration that uses content zooming as a technique to change the degree of abstraction of map content independently of the map scale. We concentrate on „foreground data‖ (rather than the base map, or map background), and more precisely on POI data and thus on point generalisation. Content zooming provides the user with the capability to change the amount and the granularity of foreground information presented, while keeping the geometric map scale the same. Content zooming allows overriding the effects of ‗standard‘ map generalisation, focusing on optimised content representation to aid the information seeking task of a mobile user. It is thus complementary to map generalisation. Three cases of content zooming operations are distinguished: two cases apply changes to the amount of foreground data presented, while the third c...
European Review of Aging and Physical Activity, 2020
Background Map-based tools have recently found their way into health-related research. They can p... more Background Map-based tools have recently found their way into health-related research. They can potentially be used to quantify older adults’ life-space. This study aimed to evaluate the validity (vs. GPS) and the test-retest reliability of a map-based life-space assessment (MBA). Methods Life-space of one full week was assessed by GPS and by MBA. MBA was repeated after approximately 3 weeks. Distance-related (mean and maximum distance from home) and area-related (convex hull, standard deviational ellipse) life-space indicators were calculated. Intraclass correlations (MBA vs. GPS and test-retest) were calculated in addition to Bland-Altman analyses (MBA vs. GPS). Results Fifty-eight older adults (mean age 74, standard deviation 5.5 years; 39.7% women) participated in the study. Bland-Altman analyses showed the highest agreement between methods for the maximum distance from home. Intraclass correlation coefficients ranged between 0.19 (95% confidence interval 0 to 0.47) for convex h...
ISPRS International Journal of Geo-Information, 2020
Cartographic generalization research has focused almost exclusively in recent years on topographi... more Cartographic generalization research has focused almost exclusively in recent years on topographic mapping, and has thereby gained an incorrect reputation for having to do only with reference or positional data. The generalization research community needs to broaden its scope to include thematic cartography and geovisualization. Generalization is not new to these areas of cartography, and has in fact always been involved in thematic geographic visualization, despite rarely being acknowledged. We illustrate this involvement with several examples of famous, public-audience thematic maps, noting the generalization procedures involved in drawing each, both across their basemap and thematic layers. We also consider, for each map example we note, which generalization operators were crucial to the formation of the map’s thematic message. The many incremental gains made by the cartographic generalization research community while treating reference data can be brought to bear on thematic car...
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Papers by Pia Bereuter