Papers by Masatoshi Arikawa
Japan Geoscience Union, Apr 7, 2014
In geoscience, spatial structure of the object are important subjects and their representation is... more In geoscience, spatial structure of the object are important subjects and their representation is necessary. This session discusses preparation, visualization and analysis methods of spatial data and their application to science and human society, aiming at the development of mapping and other spatial representation methods.
Japan Geoscience Union, Apr 7, 2014
Database Systems for Advanced Applications, Apr 2, 1991
Many studies of interactive environments of object-oriented databases are based on extensions to

Electronics
With the ageing of society, the number of households with older individuals or couples living alo... more With the ageing of society, the number of households with older individuals or couples living alone is increasing. An “ageing-in-place” approach allows older adults to continue to live at home and receive help only when needed. However, this approach is insufficient for emergencies, such as falls, as well as for individuals with gradually deteriorating health conditions, such as frailty. Unexpected accidents significantly reduce the quality of life (QoL) of older adults. This paper proposes a new framework, the mobility ubiquitous sensor edge environment (MUS3E), to digitally transform ordinary houses to detect the movement of older individuals throughout their home environment and to notify family members and care providers of residents’ health status and safety information. The framework can be easily and inexpensively installed in any home, transforming an ordinary house into a smart home with an automated function for monitoring older residents. It uses ambient sensors such as p...
In order to handle more than one relaLionship in multi-media data, we have introduced multiple-re... more In order to handle more than one relaLionship in multi-media data, we have introduced multiple-relationship object hierarchy. $\Lambda s$ in databases inheritance from children to parents (bottom-up) is also important, general version of inheritance is also discussed, both top-down and bottom-up. Concepts introduced in this papers are considered to be useful to realize various views in multi-media databases. Recently there have been a lot of efforts to realize multi-media databases. One promising data model for such databases is the object oriented data model. To realize a multi-media database system, we need to handle problems which do not appear in conventional database systems. Among these problems, we have a -1-
Introducing Leader Lines into Scale-Aware Consistent Labeling
Advances in Cartography and GIScience
Consistently placing annotation labels across map scales often poses a problem due to the restric... more Consistently placing annotation labels across map scales often poses a problem due to the restriction of the screen space. This problem becomes further exacerbated when we navigate by arbitrarily zooming in and out of digital maps on mobile devices. In this paper, we introduce leader lines to conventional techniques for scale-aware consistent labeling to accommodate more annotation labels on the map domain while retaining their plausible arrangement. The overall visibility of annotation labels is optimized using genetic algorithms while avoiding their unwanted popping effects and sudden leaps regardless of the change in the map scale. The feasibility of the proposed approach is demonstrated by experimental results including comparison with relevant techniques.
A Framework for Generating Opt-in Data Donation Map Apps Based on ManpoKit
Japan Geoscience Union, 2016
A Visual Tool for Improving SVG Maps

Nowadays, digital map services provide a large amount of spatial data and thus facilitate users t... more Nowadays, digital map services provide a large amount of spatial data and thus facilitate users to dynamically navigate map contents across multiple scales on small mobile devices. In this context, consistently placing map labels in interactive navigation is important but still technically challenging, especially when the labels are associated with multiple layers, which are inherent in map contents. In this paper, we introduce a genetic-based approach to optimize the placement of annotation labels with different ranges of map scales by maximizing label visibility of the existing scale while avoiding unwanted mutual overlaps and sudden popping effects. This is accomplished by grouping the label IDs into multiple chromosomes according to their importance and then forming composite chromosomes, each of which is reordered to optimize the overall visibility of the labels. Our formulation also allows the individual labels to move across the scale adaptively in order to further improve la...

International Journal of Art, Culture, Design, and Technology, 2019
Schematizing railway networks for better readability is often achieved by aligning railway lines ... more Schematizing railway networks for better readability is often achieved by aligning railway lines along the octilinear directions. However, such railway map layouts require further adjustment when placing station name labels. In this article, the authors present a novel approach to automating the placement of station names around the railway network while maximally respecting its original layout as the mental map. The key idea is to progressively annotate stations from congested central downtown areas to sparse rural areas. This is accomplished by introducing the sum of geodesic distances over the railway network to properly order the stations to be annotated first, and then elongating the line segments of the railway network while retaining their directions to spare enough labeling space around each station. Additional constraints are also introduced to restrict the aspect ratios of the region confined by the railway network for better preservation of the mental map.

Theory and Applications of GIS, 1994
One of the most important and novel issues of users' generating interactive maps from geographic ... more One of the most important and novel issues of users' generating interactive maps from geographic databases is the adaptive control of the amount of visual components comprising the maps with compromises between users' requirements and limitations of display devices. If users adjust the amount by hand through database query languages, the processes must be very tedious. This paper proposes an environment of supporting users' generating maps from the point of view of new style methods of generalization for raw objects (data) retrieved from geographic databases. The environment provides automatic functions of releasing users' requirements according to limitations of display devices. Also, it aids users to decide characteristic parameters of the maps with some new concepts of measuring states of a map, such as the saturation of it, the inconsistent context of it, and ranks of visualization methods for retrieved raw objects.

Abstracts of the ICA
With the spread of mobile devices and the advances of computational techniques on geo-referenced ... more With the spread of mobile devices and the advances of computational techniques on geo-referenced data, location-based services (LBSs) have offered many benefits, such as searching neighbour spots and navigations, as one of the significant domains of computer science. Our research aims to establish a learning toolkit and its educational practice on LBSs for the realisation of STEAM in the field of cartography. STEAM, a new educational interest, refers to the importance of science, technology, engineering, the arts, and mathematics through creative activities. The authors have conducted a class at Akita University in Japan, which was set for junior university students majoring in computer science. Most students were considered to have little background knowledge of cartography and geographic information systems. Considering that STEAM education should inspire students' creativity in their learning, the class has assigned group work aiming to understand theories and implementations of basic LBSs through map storytelling creation. Specifically, students prepare illustrated maps and points of interest (POIs) with a theme, combine geo-referenced data with mobile LBSs to represent their stories dynamically, and demonstrate the user experiences of the services. Through mobile learning, students can obtain an opportunity to check how their services work in the real world and present their map stories to others, which leads to exploring technical issues of LBSs from the viewpoints of application users and software engineers.

ISPRS International Journal of Geo-Information
This paper proposes a model-less feedback system driven by tourist tracking data that are automat... more This paper proposes a model-less feedback system driven by tourist tracking data that are automatically collected through mobile applications to visualize the gap between geomedia recommendations and the actual routes selected by tourists. High-frequency GPS data essentially make it difficult to interpret the semantic importance of hot spots and the presence of street-level features on a density map. Our mobile collaborative framework reorganizes tourist trajectories. This processing comprises (1) extracting the location of the user-generated content (UGC) recording, (2) abstracting the locations where tourists stay, (3) discarding locations where users remain stationary, and (4) simplifying the remaining points of location. Then, our heatmapping system visualizes heatmaps for hot streets, UGC-oriented hot spots, and indoor-oriented hot spots. According to our experimental study, this method can generate a trajectory that is more adaptable for hot street visualization than the raw t...

Progressive Annotation of Schematic Railway Maps
2018 22nd International Conference Information Visualisation (IV)
Octilinear network layouts are commonly used as the schematic representation of railway maps due ... more Octilinear network layouts are commonly used as the schematic representation of railway maps due to their enhanced readability. However, it is often time-consuming to place station names on such railway maps by trial and error, especially within the limited labeling space around interchange stations. This paper presents a progressive approach to placing station names around stations in schematic railway maps for better automation of map labeling processes. The idea behind our approach is to annotate stations in dense downtown areas around the interchange stations first and then those in sparse rural areas. This is achieved by introducing the sum of geodesic distances over the railway network to identify the proper order in which to annotate stations. In the actual annotation process, we increase the labeling space around the railway network when necessary by progressively stretching railway line segments while retaining their original directions, which allows us to respect the original schematic layout as much as possible. We present several experimental results to demonstrate the effectiveness of the proposed approach, together with a discussion on parameter tuning in our formulation.
POI-based Inter-Georeference for Enabling Picture Route Maps in Location-based Mobile Services for Walking Tours
Map, Journal of the Japan Cartographers Association, 2012
Japan Geoscience Union, 2014

近年、技術の進歩に伴い、地理空間情報はさまざまな方面で活用されている。特に防災・減災においては、リ スク情報の可視化、災害状況の把握、救助・救援活動の支援、復旧・復興計画、災害情報の共有など、防... more 近年、技術の進歩に伴い、地理空間情報はさまざまな方面で活用されている。特に防災・減災においては、リ スク情報の可視化、災害状況の把握、救助・救援活動の支援、復旧・復興計画、災害情報の共有など、防 災・減災のあらゆるステージにおいて、地理空間情報が重要な役割を果たす。このことは国際社会においても 広く認識され、第3回国連防災世界会議で採択された「仙台防災枠組2015-2030」に地理空間情報活用の重要性 が記載されるなど、必要不可欠な情報として重要視されている。本発表では、このうち、災害発生時の対応に 着目し、災害時に求められる地理空間情報について議論する。 筆者らは、災害発生時における地理空間情報の役割を、次の4つに整理した:1)災害の全体像を迅速かつ正確 にとらえること(空中写真撮影、リモートセンシング、空中写真判読、地図による情報の集約・可視化な ど);2)国土の変化を精密に把握すること(地殻変動観測、干渉SARなど);3)復旧・復興のための基準を 提供すること(基準点改測、復興基図、GISを活用した進捗管理など);4)災害を分析し、次の災害に備える こと(地殻変動解析、断層モデル、災害地理調査、防災計画見直しなど)。 災害対応において地理空間情報がどのように利用されたかを明らかにするため、筆者らは平成27年9月関東・東 北豪雨の対応が一段落した後、災害対応に携わった国や地方の関係機関に対してアンケートを行い、地理空間 情報がどのような目的で活用されたかの調査を行った。その結果、主に、被害予測、被害状況の把握、作業計 画、実動部隊の資料、復興事業の査定資料の5つの業務に利用されたことがわかった。土地の標高等の地理空 間情報から氾濫水の広がりの推定などの被害予測に活用され、空中写真画像等の地理空間情報は被害状況の把 握に活用された。また、浸水範囲の判読結果は人員配置計画に活用され、正射画像は現地調査に活用されると 共に復興事業の査定における資料として活用された。 迅速および確実かつ効果的な対応が求められる災害対応において、地理空間情報を効果的に活用するためには 次の二つの視点が重要である。すぐ使える情報であること、信頼できる情報であることである。どちらか一方 が欠けることは、救援救助活動に支障をきたすことに直結する国土地理院は、引き続き効果的な地理空間情報 ...

Timeline collaging as an extension of map collaging using geo-referencing and time-referencing
2017 Pacific Neighborhood Consortium Annual Conference and Joint Meetings (PNC), 2017
Nowadays, there is an explosion of spatio-temporal data, such as big data of human movements and ... more Nowadays, there is an explosion of spatio-temporal data, such as big data of human movements and aerial photographs taken in time series. Interactive and dynamic visualization of such data play important roles in researching and applications in the fields of traffic controlling, education, storytelling and so on. On the other hand, besides of the “modern” digital data, there are also large amount of “traditional” analogue data in the forms of maps, books, photographs and so on. Such analogue materials are valuable for historical researches and education, but current spatio-temporal visualization systems are not good at dealing such analogue materials compared to their performances on digital data. This paper introduces our research on collaging analogue maps and timeline graphs through geo-references and time-references, to enrich the analogue materials with multimedia digital data, and enable user interactions and dynamic visualization of the enriched data on digital devices for re...
Pseudo 3-D space representation system, pseudo 3-D space constructing system, game system and electronic map providing system
A 3-D Photo Collage System for Spatial Navigations
Lecture Notes in Computer Science, 2002
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Papers by Masatoshi Arikawa